Science-based height calculator / adult height predictor, which also doubles as a height conversion calculator (cm to ft, etc.). Accurately predict a child’s adult height and learn how tall it will be when it grows up (answering the “How Tall Will I Be?” question), or convert height units between metric and imperial systems. The height predictor mode: Enter child’s current age, gender, and height, and get an estimate of adult height.
The height conversion mode: Convert between cm, m, ft, in, and more.
Height Calculator
Are you curious about how to increase your height or wondering if you can still grow taller even after puberty? Whether you’re a teenager looking for tips on gaining height or an adult hoping to maximize your growth potential, this comprehensive guide will walk you through the science, the myths, and practical strategies that might help you get the most out of your natural growth process.
Disclaimer: This article is intended for informational purposes only. Always consult with a healthcare professional before starting any new health, nutrition, or exercise regimen.
1. Understanding Height: The Science Behind Your Stature
Height is one of the most noticeable physical attributes of our bodies, yet few truly understand what determines it and how it is measured. By exploring the science behind height, we can better grasp the ways to influence it naturally.
How Is Height Measured?
Height is generally measured as the distance from the bottom of your feet to the top of your head. Here are some key points on height measurement:
- Standard Method: A stadiometer—a medical device that includes a vertical ruler and a sliding horizontal headpiece—is typically used in clinics for an accurate measurement.
- At Home: You can use a measuring tape against a wall. Stand straight with your back against the wall, and mark the spot where the top of your head meets the wall.
- Time of Day: Height can vary slightly throughout the day because of spinal compression. It is often best measured in the morning when the spine is at its fullest length.
- Consistency is Key: For tracking growth, measure under similar conditions (time of day, posture, and equipment) to ensure consistency.
Genetics vs. Environment: What Determines Your Height?
When pondering questions such as “how to grow taller than your genetic height” or “how can I increase my height?”, it’s important to understand the two primary factors:
- Genetic Factors: Your DNA plays a major role in determining your maximum potential height. Studies suggest that up to 80% of your height is inherited. If your parents are tall, chances are you might be too, but there are always exceptions.
- Environmental Factors: Nutrition, physical activity, sleep, and overall health also influence your growth. Even if genetics set your potential, these environmental factors can help you reach that potential. For example:
- Nutrition: A balanced diet rich in proteins, vitamins, and minerals is crucial.
- Exercise: Regular physical activity stimulates growth hormones.
- Sleep: Adequate rest allows your body to repair and regenerate tissues, including those responsible for growth.
- Health Conditions: Chronic illnesses or hormonal imbalances can negatively affect growth.
Understanding these factors provides a foundation for exploring natural methods to potentially increase your height.
2. Answering the Most Common Height-Related Queries
There are numerous questions surrounding height and growth, and we’ve compiled answers to many of the most frequently asked queries below:
How to Increase Height?
Q: How to increase height naturally?
A: The primary methods include proper nutrition, consistent exercise, and adequate sleep. Incorporating stretching and yoga can also improve posture, making you appear taller.
Q: How can I increase my height?
A: Focus on a holistic approach:
- Nutrition: Eat a balanced diet with plenty of protein, calcium, and vitamins.
- Exercise: Engage in sports, strength training, and stretching routines.
- Sleep: Ensure 7-9 hours of quality sleep per night.
- Posture: Practice activities that promote a straight, upright posture.
How Do I Grow Taller?
Q: How do I grow taller than my current height?
A: Although you cannot change your genetic ceiling, you can optimize your growth potential during your developmental years by:
- Maintaining a nutrient-rich diet.
- Regular physical activity that encourages growth hormone production.
- Avoiding habits that can stunt growth, such as poor posture or inadequate sleep.
How Can I Gain Height?
Q: How can I gain height quickly?
A: Rapid height increase is unlikely without medical intervention (which is typically reserved for growth hormone deficiencies). Instead, focus on long-term health strategies that support overall growth.
Additional Queries Addressed
- How to Growth Height / How to Grow Your Height: These phrases emphasize the natural progression of growth. Enhancing nutrition, exercise, and sleep can help your body reach its maximum potential.
- How to Increase Height Growth Hormone: While you cannot directly control your growth hormone levels, natural methods like regular exercise, especially high-intensity interval training (HIIT), and a proper diet can encourage optimal hormone production.
- How to Get Taller as an Adult: Even though growth plates close after puberty, adults can improve their posture and spinal alignment to maximize their perceived height.
- How to Grow 6 Feet Tall After Puberty: This is more of a myth. Post-puberty, significant increases in height are highly unlikely, and any claims suggesting otherwise should be approached with skepticism.
- How to Gain an Inch in Height: Focusing on posture, spinal decompression through stretching, and overall health improvements might help you gain a fraction of an inch, though expectations should be realistic.
- How to Increase Body Height: This is a comprehensive question that encompasses various factors, including diet, exercise, sleep, and overall health, all contributing to achieving your full height potential.
3. Natural Methods to Boost Your Height
If you’re determined to explore natural ways to potentially increase your height, there are several areas you can focus on. This section will cover everything from nutrition and exercise to lifestyle adjustments.
Nutrition and Diet: Building Blocks for Growth
1. Protein-Rich Foods:
Proteins are essential for tissue repair and muscle building. Include sources such as:
- Lean meats (chicken, turkey)
- Fish and seafood
- Dairy products (milk, cheese, yogurt)
- Legumes (beans, lentils)
- Nuts and seeds
2. Calcium and Vitamin D:
These nutrients are critical for bone health and development.
- Calcium: Found in dairy products, leafy greens, almonds, and fortified foods.
- Vitamin D: Obtained from sunlight exposure and foods like fatty fish, fortified milk, and egg yolks.
3. Essential Vitamins and Minerals:
Other micronutrients also play roles in growth:
- Zinc: Supports cell growth and division. Foods rich in zinc include oysters, beef, pumpkin seeds, and legumes.
- Magnesium: Helps with bone formation. Sources include whole grains, nuts, and green leafy vegetables.
- Vitamin C: Important for collagen production and tissue repair. Found in citrus fruits, strawberries, and bell peppers.
4. Hydration:
Water is often overlooked, but proper hydration aids digestion, nutrient absorption, and overall cellular function. Drinking enough water daily is crucial for all bodily processes, including growth.
Exercise and Stretching: The Role of Physical Activity
Physical activity is not only essential for overall health but also for stimulating growth hormones that may contribute to your height potential. Here’s how you can incorporate exercise into your routine:
1. Stretching Exercises:
Stretching can help decompress your spine and improve posture. Consider:
- Dynamic Stretching: Movements like arm swings, leg kicks, and torso twists.
- Static Stretching: Holding stretches such as the toe-touch, cobra pose, or the bridge stretch for 20-30 seconds.
2. Yoga and Pilates:
These practices focus on core strength, flexibility, and alignment.
- Yoga Poses: Mountain pose, downward dog, and cobra can improve posture and strengthen back muscles.
- Pilates: Focuses on core stabilization and alignment, contributing to a longer, leaner appearance.
3. Strength Training:
While building muscle, strength training also supports bone health.
- Bodyweight Exercises: Push-ups, squats, and planks.
- Resistance Training: Using light weights can be beneficial when done correctly and safely.
4. Sports and Recreational Activities:
Engaging in sports such as basketball, swimming, and cycling not only promotes overall fitness but also encourages the natural release of growth hormones. These activities also improve coordination and posture.
Sleep and Recovery: Let Your Body Rest and Grow
1. Importance of Sleep:
Growth hormone, which is vital for height, is primarily secreted during deep sleep. Prioritize:
- Quality Sleep: Aim for 7-9 hours of sleep per night.
- Sleep Schedule: Maintain a consistent sleep routine, even on weekends.
- Sleep Environment: Ensure a comfortable, dark, and quiet sleeping environment to facilitate deep sleep cycles.
2. Relaxation and Stress Management:
Chronic stress can negatively impact your growth. Techniques include:
- Meditation and Mindfulness: These can help manage stress and promote better sleep.
- Deep Breathing Exercises: They reduce tension and help you relax before bedtime.
By integrating these natural methods into your daily routine, you not only improve your chances of reaching your genetic height potential but also enhance your overall health and well-being.
4. The Role of Growth Hormone in Height Increase
Growth hormone (GH) is a protein produced by the pituitary gland and plays a pivotal role in growth during childhood and adolescence. Understanding its function can help clarify many of the questions like “how to increase height growth hormone” and “how does height increase”.
Natural Boosters for Growth Hormone
While the secretion of GH is largely genetically controlled, certain lifestyle choices can optimize its natural production:
- High-Intensity Exercise: Engaging in activities like sprinting, HIIT, and resistance training can stimulate GH production.
- Adequate Sleep: As mentioned earlier, deep sleep cycles are essential for optimal GH secretion.
- Proper Nutrition: A balanced diet with amino acids (found in proteins) supports the synthesis of growth hormones.
- Intermittent Fasting: Some studies suggest that intermittent fasting may boost GH levels, although this method should be approached cautiously and under professional guidance.
- Stress Reduction: Since high cortisol levels (a stress hormone) can inhibit GH production, stress management is key.
Medical Interventions: When and Why They’re Considered
In rare cases, individuals with a deficiency in growth hormone may be prescribed synthetic GH therapy. However, this intervention:
- Is Only for Diagnosed Cases: GH therapy is generally reserved for those with medical conditions causing growth deficiencies.
- Has Side Effects: The therapy can have significant side effects and should only be administered under strict medical supervision.
- Is Not a Universal Solution: For the vast majority, natural methods are both safer and more sustainable.
It’s essential to note that over-the-counter supplements claiming to dramatically increase height by boosting GH are not scientifically proven and can sometimes be harmful.
5. Targeted Strategies for Different Age Groups
Your approach to increasing height should be tailored to your age and stage of development. Here, we break down strategies for teenagers, young adults, and mature adults.
Teenagers and Adolescents: Maximizing Growth at 14-17 Years
For those in their teenage years, every day counts as your body is still developing. This is the best time to:
- Optimize Your Diet: Ensure you’re consuming all the essential nutrients to support bone and muscle growth.
- For Example: How to gain height at 15, or how to increase height at the age of 15 (female) can be addressed by including protein-rich foods, calcium, and vitamins in your diet.
- Gender-Specific Tips: For girls at 15-16 and boys at 17, nutritional requirements might vary slightly, so tailor your meals to include foods that support hormonal balance and bone density.
- Incorporate Physical Activity:
- Sports: Activities like basketball, volleyball, and swimming are great for stimulating growth hormones.
- Stretching and Yoga: Regular sessions can improve posture and potentially add an extra inch or two in perceived height.
- Sleep Routine: Prioritize deep, uninterrupted sleep to maximize growth hormone release.
- Avoid Growth Stunting Habits: Smoking, excessive caffeine, and poor dietary choices can adversely affect your growth. Focus on positive habits that support long-term health.
Adults: How to Get Taller After Puberty
For many adults, questions like “how to get taller as an adult” and “how to increase height after puberty” often arise. While significant bone growth is unlikely once your growth plates close, there are still methods to optimize your appearance and posture:
- Posture Improvement:
- Core Strengthening: Engage in exercises that target your core and back muscles to support a straighter posture.
- Stretching Routines: Consistent stretching can decompress your spine, potentially making you appear taller.
- Appropriate Footwear:
- Elevator Shoes: While they do not increase your actual height, certain shoe designs can add a few inches.
- Heel Inserts: For women especially, inserts in your shoes can enhance your overall appearance.
- Clothing Choices:
- Vertical Patterns: Wearing clothes with vertical stripes can create the illusion of added height.
- Tailored Fits: Clothing that fits well and is proportionate to your body can improve your silhouette.
- Lifestyle Adjustments:
- Ergonomics: Adjust your work and home environments to promote proper posture.
- Mindfulness: Being conscious of how you sit, stand, and move can have a lasting impact on your overall posture.
For adults wondering “how to gain an inch in height”, these methods may not add bone length, but they can certainly enhance your presence and confidence.
6. Lifestyle and Posture: Enhancing Your Natural Stature
Your lifestyle habits and posture can significantly influence how tall you appear. Even if your bones have reached their maximum potential, improving these aspects can make a noticeable difference.
Ergonomics and Daily Habits
- Workstation Setup:
- Correct Desk Height: Ensure that your computer workstation is set up so that you can sit comfortably with your back straight.
- Frequent Breaks: Take regular breaks to stretch and move around, which can help reduce spinal compression.
- Active Lifestyle:
- Regular Movement: Avoid long periods of sitting. Incorporate short walks or stretching breaks into your daily routine.
- Exercise Habits: Consistent exercise not only benefits your overall health but also improves your posture and core strength.
Mindful Practices and Posture Correction
- Posture Exercises:
- Wall Slides: Stand with your back against a wall and slide your arms upward to strengthen your upper back.
- Shoulder Blade Squeezes: Regularly practice squeezing your shoulder blades together to promote an upright stance.
- Yoga and Meditation:
- Yoga Poses: Incorporate yoga poses like the Mountain Pose and Tree Pose to enhance balance and posture.
- Mindful Sitting and Standing: Be conscious of your body alignment throughout the day. Simple reminders to sit up straight can be very effective.
- Posture Braces: In some cases, using a posture brace temporarily may help retrain your muscles to maintain a straight back.
By integrating these habits into your everyday life, you can not only improve your overall health but also optimize your appearance, making you seem taller and more confident.
7. Debunking Myths: What Really Works and What Doesn’t
The internet is rife with claims about miraculous ways to gain height—sometimes suggesting you can add 5 inches or even grow 6 feet tall after puberty. It’s important to separate fact from fiction.
Miracle Pills and Quick Fixes
- Supplements:
- The Reality: There is no scientifically proven supplement that can drastically increase your height beyond your genetic potential. Many supplements claim to boost growth hormone or stimulate bone growth, but these claims are often unsupported by rigorous scientific studies.
- Safety Concerns: Over-the-counter supplements may even pose health risks. It is always advisable to consult a healthcare professional before trying any new supplement regimen.
- Surgical Procedures:
- Limb-Lengthening Surgery: This is a very invasive procedure that involves breaking the bones and using specialized equipment to gradually stretch them. While it can add inches, it is accompanied by significant risks, long recovery times, and is typically reserved for extreme cases of dwarfism rather than cosmetic height increase.
Realistic Expectations and Self-Acceptance
- Understanding Limits:
- Genetic Potential: Recognize that your genes largely determine your maximum height. Efforts to “grow taller” should focus on optimizing your health and posture rather than expecting dramatic changes.
- Perceived Height: Improving your posture and overall fitness can help you make the most of your natural height. Sometimes, looking taller is more about how you carry yourself than your actual stature.
- Mental and Emotional Well-Being:
- Self-Acceptance: Embrace your unique qualities. Height is just one aspect of who you are, and confidence comes from a holistic sense of well-being.
- Focus on Strengths: Channel your energy into areas where you can make a difference, whether it’s your career, relationships, or personal passions.
8. Comprehensive FAQs: All Your Queries Answered
Here we address a wide range of questions to ensure that every query—from “how to get your height” to “how do you increase your height”—is answered.
Q1: How Can I Increase My Height?
A: You can work on increasing your height naturally by focusing on:
- Balanced Diet: Eat nutrient-rich foods that support bone and muscle growth.
- Regular Exercise: Engage in stretching, strength training, and sports to stimulate growth hormones.
- Adequate Sleep: Ensure you get 7-9 hours of quality sleep.
- Proper Posture: Maintain an upright posture to maximize your natural height appearance.
Q2: How Is Height Measured?
A: Height is measured from the bottom of your feet to the top of your head using a stadiometer or a measuring tape. For consistency, measure at the same time of day, ideally in the morning.
Q3: How Do I Grow Taller Than My Genetic Height?
A: While your genetic potential is predetermined, you can ensure you reach that potential by:
- Optimizing your nutrition and exercise routines.
- Maintaining a healthy lifestyle and getting enough sleep.
- Improving posture to make the most of your natural stature.
Q4: How Can I Gain Height at 15?
A: At age 15, your body is still developing. Focus on:
- Nutrition: Incorporate proteins, calcium, vitamins, and minerals.
- Exercise: Engage in sports and stretching exercises.
- Sleep: Prioritize a regular sleep schedule.
Q5: How Can I Get Taller as an Adult?
A: Although significant height increases are unlikely after puberty, you can:
- Improve your posture through core strengthening and stretching.
- Use proper footwear and clothing to create an illusion of added height.
- Maintain a healthy lifestyle to support overall well-being.
Q6: How to Increase Height Growth Hormone Naturally?
A: Natural ways to boost growth hormone include:
- High-intensity exercise and strength training.
- Adequate sleep.
- A balanced diet rich in proteins and healthy fats.
- Managing stress effectively.
Q7: How to Gain an Inch in Height?
A: While drastic changes are unlikely, you might gain a fraction of an inch by:
- Engaging in regular stretching and yoga.
- Correcting your posture.
- Ensuring proper spinal alignment through exercises and ergonomic practices.
Q8: How to Increase Height at Home?
A: You can perform various home-based exercises such as:
- Stretching routines (e.g., toe touches, cobra stretches).
- Yoga sessions focusing on back and core strength.
- Posture exercises that can be done without special equipment.
Q9: How Do You Increase Your Height After 17?
A: For those over 17, focus on:
- Improving posture through regular exercise.
- Strength training to support your skeletal structure.
- Ensuring you have a nutrient-dense diet and healthy lifestyle.
Q10: How to Increase Height for Men and Women?
A: The principles remain the same for both genders:
- Nutrition: Adequate proteins, vitamins, and minerals.
- Exercise: Engage in sports, stretching, and strength training.
- Sleep: Prioritize consistent, quality sleep.
- Posture: Maintain an upright posture to maximize your height.
Q11: How Does Height Increase?
A: Height increases as a result of:
- Bone growth during developmental years, particularly at the growth plates.
- The production of growth hormone which facilitates cell division and bone elongation.
- Environmental factors such as nutrition, physical activity, and overall health.
Q12: How to Not Get Taller or Not Grow Taller?
A: While many aim to increase their height, some individuals may be concerned with preventing excessive growth due to medical conditions. In these cases, it is important to:
- Follow the advice of a healthcare professional.
- Understand that most natural growth stops after the closure of growth plates.
Q13: How to Increase 5 Inch Height or Grow 6 Feet Tall After Puberty?
A: Claims of such dramatic increases are largely myths. No natural method or supplement has been scientifically proven to add 5 inches or more in height after puberty. Focus instead on optimizing your overall health and posture.
Q14: How to Gain Weight and Height Together?
A: A balanced approach to diet and exercise can help:
- Diet: Include calorie-dense, nutrient-rich foods.
- Exercise: Combine strength training with stretching to support both muscle gain and posture improvement.
Q15: How to Increase Height and Weight for Overall Health?
A: The key is a comprehensive plan:
- Diet: Consume balanced meals with a mix of proteins, carbohydrates, and healthy fats.
- Exercise: Alternate between strength training for muscle gain and cardio for overall fitness.
- Lifestyle: Ensure adequate sleep and manage stress effectively.
9. Putting It All Together: Combining Diet, Exercise, and Lifestyle for Best Results
The journey to maximize your height potential—whether you’re in your teens or well into adulthood—is a holistic one. Here’s a detailed plan that combines the various elements we’ve discussed:
Sample Daily Routine
Morning:
- Wake-Up & Hydration: Start your day with a glass of water to rehydrate your body.
- Stretching Routine: Spend 10-15 minutes on dynamic stretches (e.g., arm swings, leg kicks) and yoga poses like the Mountain Pose to awaken your muscles and improve spinal alignment.
- Healthy Breakfast: Opt for a protein-rich breakfast that includes eggs, whole grains, fruits, and a dairy product to fuel your body.
Mid-Morning:
- Light Activity: Take a short walk or do a brief session of posture exercises.
- Snack: Have a snack that includes nuts or yogurt for a protein and calcium boost.
Afternoon:
- Balanced Lunch: Include lean proteins (chicken, tofu, legumes), complex carbohydrates (brown rice, quinoa), and vegetables.
- Post-Lunch Walk: A 10-minute walk can help with digestion and stimulate growth hormone production.
- Exercise Session: Dedicate 30-45 minutes to a mix of strength training (bodyweight exercises, resistance training) and stretching exercises.
Evening:
- Healthy Dinner: Focus on a balanced meal with lean protein, vegetables, and healthy fats (avocado, olive oil).
- Relaxation & Stretching: Wind down with a gentle yoga or stretching session. Focus on poses that relieve spinal compression, such as the cobra or child’s pose.
Night:
- Winding Down: Avoid screens at least 30 minutes before bedtime to ensure quality sleep.
- Adequate Sleep: Aim for 7-9 hours of restful sleep to facilitate the natural release of growth hormones.
Dietary Recommendations
- Breakfast Options: Scrambled eggs with spinach, oatmeal with nuts and berries, or a protein smoothie.
- Lunch & Dinner: Incorporate lean proteins, whole grains, and plenty of vegetables. Consider foods fortified with calcium and vitamin D.
- Snacks: Fresh fruits, nuts, yogurt, or a small serving of cheese.
- Hydration: Aim for at least 8-10 glasses of water throughout the day. Herbal teas can also be a soothing addition.
Exercise Recommendations
- Strength Training: 2-3 sessions per week focusing on core and back muscles to support posture.
- Cardio: Moderate-intensity cardio 2-3 times a week, such as jogging, cycling, or swimming.
- Stretching/Yoga: Daily stretching routines that target the spine and legs.
- Posture Correction: Incorporate posture exercises throughout the day, especially if you have a desk job.
Lifestyle Adjustments
- Sleep Hygiene: Create a bedtime routine that signals your body to wind down. A consistent sleep schedule is crucial.
- Stress Management: Engage in meditation, deep breathing, or mindfulness exercises to reduce stress levels.
- Avoid Harmful Substances: Limit caffeine intake in the evening, avoid smoking, and steer clear of other substances known to negatively impact growth.
10. Additional Considerations and Expert Insights
While much of the advice provided here is based on scientific principles and expert recommendations, it is important to consider your personal circumstances.
Professional Consultations
- Medical Check-Ups: Regular visits to your healthcare provider can help monitor your growth, especially during your teenage years.
- Nutritionists and Dietitians: They can tailor a diet plan specific to your needs, ensuring you get the right nutrients to support your growth.
- Fitness Trainers: A trainer with experience in posture correction and strength training can design a personalized exercise program.
Personal Success Stories
Many individuals have reported improvements in their posture and overall well-being after implementing these strategies. While actual height may not increase dramatically after a certain age, the benefits of improved health, confidence, and physical fitness are well worth the effort.
Scientific Research and Studies
Ongoing research continues to shed light on the complex interplay between genetics, nutrition, hormones, and environmental factors in determining height. Stay updated with reputable sources and scientific journals for the latest findings in this area.
Using the height calculator
With the help of our height calculator you can predict the future height of a child patient, your own child, or yourself, if you are still under 18. All you need as input is the current age, gender, and current height. Unlike other mature height calculators, ours does not require you to enter your weight or your parent’s heights while being just as accurate if not more accurate (see below).
So, to estimate how tall a child will be, first, select their biological sex (gender). Then enter their current age: type in whole years manually and select the number of months by rounding to the nearest whole month. For a newborn, enter zeroes in both years and months. Enter their height in feet and inches or in cm or meters. If doing this for your child or a child patient, enter their age and height. Finally, press “Calculate Adult Height” to get the estimated adult height in centimeters and feet and inches. The tool works great when used to predict the height of a teenager as well.
In height converter mode, the height calculator allows you to easily convert cm to ft and in, or ft and in to centimeters or meters. Just choose ‘Height conversion’ mode.
How to predict a child’s adult height?
This child height calculator adopts the latest science in the area of height prediction by using an advanced method based on multiplier tables. The multiplier method was developed in 2004 by J.Paley et al. [1] using data published by the United States Centers for Disease Control and Prevention (CDC). The accuracy of the multiplier method was compared with the CDC growth charts (a preferred method when available) using longitudinal growth data from 52 normal children. No significant differences were noted between predictions made using the CDC growth charts versus the multiplier method meaning our tool is a highly accurate height calculator for teenagers and children alike.
The future prediction method was also compared to other growth databases from around the world and from different eras and the height multipliers were shown to be independent of height percentile, race, and generation, indicating that the multiplier method is universal. The accuracy of the method used in this future height calculator is comparable with that of the Bayley-Pinneau [2], RWT [3], and TW3 [4] methods.
The last part is especially relevant in the U.S. and Europe where the ethnic diversity of the general population makes it impossible for pediatricians to keep up with the multitude of growth charts needed for their racially diverse patients. Furthermore, it is unclear which growth chart would be most appropriate for a multi-ethnic/multi-racial child whereas our calculator works in all circumstances.
How accurate is this height predictor?
As with any other statistical method applied to an individual the one used in our adult height predictor is prone to some error. There is no such thing as a 100 percent accurate adult height estimator. In height prediction science the term absolute error of prediction (AEP) is often used as a measure of predictive accuracy. It is defined as the magnitude of either overprediction or underprediction of the future height of children.
For boys, the median AEP using the multiplier method ranges from 1.4 to 4.3 cm, with the error being between 1.4 and 2.7 cm for all ages except 14 years, for which the greatest errors in prediction occurred. The 90% error range is from 1.8 to 8.3 cm, with error peaks at 6 and 14 years of age and greatest accuracy at age 8 years. Regardless of age, 58% of all height predictions were within 2.5 cm (1 in), 85% of all predictions were within 5 cm (2 in), and 96% of all predictions were within 7.5 cm (3 in) of adult height for boys.
For girls, the median absolute error of height prediction calculation using the multiplier method ranges from 0.68 to 4.38 cm until age 12 years, with increasing accuracy after that. The 90% AEP ranged from 1.5 to 10.6 cm, varying from 8 to 10.6 cm until age 13 years, and increasing in accuracy after that. Disregarding age, 50% of predictions were within 2.5 cm (1 in), 68.5% of predictions were within 5 cm (2 in), and 84% of predictions were within 7.5 cm (3 in) of adult height for girls.
We recommend that the adult height calculator is used only for children without pathologic conditions that alter the potential for growth in stature and to always consult a pediatrician when making health-related decisions.
Other methods for predicting a child’s adult stature
A number of methods for height prediction relying on examinations of skeletal structure are often used by pediatricians, for example the Bayley-Pinneau [2], the Roche-Wainer-Thissen RWT [3] and the Tanner-Whitehouse 3 method [4]. However, all these methods are subject to a wide range of error, at least partly because of the use of bone age estimations. Determination of skeletal age is relatively subjective, with a high interobserver error rate, and the relationship of skeletal age to chronologic age has been shown to differ among various ethnic groups [1]. While methods for automated bone age determination were proposed in recent years, they still require a visit to the doctor, unlike the multiplicator method.
Most online height calculators tend to use the Khamis-Roche prediction equations [5] or estimations based on the height of the mid-parent. The Khamis-Roche method has slightly larger errors than those for the Roche-Wainer-Thissen method and it requires more data than our approach using multipliers. Furthermore, the applicability of the Khamis-Roche method is limited to white American children only [5], making it unsuitable for a height prediction calculator intended for wider application.
The mid-parent height method suffers from an issue wherein if parents are unusually tall or short, their children would be relatively less tall or short, respectively, and the mid-parental height is then a poor predictor of attained height [6] and would thus provide a poor answer to the question many adolescent boys and girls ask themselves: how tall will i grow up to be?
Factors affecting height prospects of children
The single most significant factor affecting the adult height of a child is its genetics. However, a child may not reach its full genetically-determined height potential due to other factors at play, such as:
- Nutrition. Inadequate nutrition, both in terms of total calories consumed and in terms of making sure all macro and micro nutrients are present in the diet, can certainly hinder growth. See our daily calories calculator.
- Hormones. Issues with hormone levels, especially growth hormone or thyroid hormones can impact the end height in both directions.
- Diseases. Health issues, for example coeliac disease or early arthritis play a negative role
- Genetic conditions. Some specific genetic conditions such as Marfan’s syndrome or Down’s syndrome have an effect on growth.
As noted, this calculator works best for healthy children without conditions with a pronounced effect on growth. GIGAcalculator.com is not a replacement for your doctor and each child is different. Make sure to consult a pediatrician to properly and fully assess your child’s health condition and specific needs relative to their predicted adult height.
Good nutrition being a widely shared strong predictor is the reason why worldwide average height levels for adults have increased significantly following the Industrial revolution. The excess wealth created by more capitalist government systems and capitalist economies enabled most children born since to receive regular food supply. This resulted in far less malnutrition and much higher average height for both adult men and adult women. Unless substantial changes to this economic situation such as a famine occur at a local or global level, height levels should stabilize. The method used by our height calculator should produce accurate results even in such extreme situations, as noted above.
Average height of United States citizens
Below we present average heights for males and females in different ages based on the US CDC growth charts with data gathered as a part of the U.S. NCHS National Health and Nutrition Examination Survey (2011-2014) [7].
Above is the average (mean) height comparison for U.S. citizens aged 0+, while below is the median height of U.S. citizens aged 0-20, again by gender.
The significant differences in adult height between the genders are an illustration on why it is such an important component of any kind of height prediction formula employed by a height predictor. Notably, the differences in height begin to increase in the early teenage years. Teenagers are also the ones often interested in their future height and wondering “how tall will I be” for non-medical reasons.
Height conversion calculations
A height calculator is also useful in converting between height units of measurement. A few quick rules will help you in such tasks.
Cm to ft conversion
To convert centimeters to feet, divide the height in cm by 30.48. For example, if someone is 185 cm tall, to find their height in feet divide 185 by 30.48 to get 6.07 ft, or approximately 6 feet and one inch. If the height is given in meters, first divide by 100, then perform the same math to convert cm to feet.
Feet and inches to centimeters conversion
If the height is given in feet and inches, first convert the inches to feet by dividing by 12, and then convert to centimeters by multiplying by 30.48. For example, if a person is 6’3” tall, first convert this measurement to feet by dividing the number of inches by 12 (3 / 12 = 0.25), then add the result to the number of feet: 6 + 0.25 = 6.25 feet. Finally, convert ft to cm by multiplying by 30.48: 6.25 · 30.48 = 190.5 cm.