Weight Conversion Calculator

Universal Weight Converter

Quick Conversions

Common Weight Conversions

Weight Conversion Formulas

Understanding Weight Units

Kilogram (kg)

The kilogram is the base unit of mass in the International System of Units (SI). Defined by the International Bureau of Weights and Measures, one kilogram equals the mass of the International Prototype Kilogram, a platinum-iridium cylinder stored in France. As of 2019, the kilogram is defined by the Planck constant. Kilograms are used globally for most weight measurements in countries using the metric system.

Pound (lb or lbs)

The pound is a unit of mass used in imperial systems, primarily in the United States and United Kingdom. One pound equals 0.45359237 kilograms exactly. The abbreviation "lb" comes from the Latin word "libra," meaning scales or balance. Pounds are commonly used for body weight, food, and package weights in countries using imperial measurements. The term "lbs" is the plural form.

Stone (st)

The stone is a unit of weight used primarily in the United Kingdom and Ireland for measuring human body weight. One stone equals 14 pounds or approximately 6.35 kilograms. While less common in other countries, stones remain the preferred unit for personal weight in the UK. For example, a person might weigh "11 stone 5 pounds" (11 st 5 lbs).

Ounce (oz)

The ounce is a smaller unit of weight in the imperial system. One ounce equals 1/16 of a pound or approximately 28.35 grams. Ounces are commonly used for food ingredients, postal weights, and precious metals. Both liquid ounces (volume) and ounces (weight) exist—this converter deals with weight ounces only.

Gram (g)

The gram is a metric unit of mass equal to one-thousandth of a kilogram. It's the standard unit for measuring small quantities, particularly in cooking, nutrition labels, and scientific measurements. One gram equals approximately 0.035274 ounces.

Ton

Multiple "ton" definitions exist. The metric ton (tonne) equals 1,000 kilograms. The US ton (short ton) equals 2,000 pounds or approximately 907.185 kilograms. The UK ton (long ton) equals 2,240 pounds or approximately 1,016.047 kilograms. Context determines which ton is meant.

Comprehensive Conversion Tables

Kilograms to Pounds Conversion Chart

Pounds to Kilograms Conversion Chart

Kilograms to Stones Conversion Chart

Quick Reference: Common Weight Conversions

Detailed Conversion Examples

Applications of Weight Conversion

• Health and Fitness: Tracking body weight, calculating BMI, setting fitness goals across different measurement systems
• International Travel: Understanding luggage weight limits when traveling between metric and imperial countries
• Cooking and Baking: Converting recipe measurements from different countries and cookbooks
• Shipping and Postal Services: Calculating package weights for international shipping rates
• E-commerce: Listing product weights for international online sales
• Medical and Healthcare: Recording patient weights, dosing medications based on body weight
• Sports and Athletics: Weight class requirements in boxing, wrestling, weightlifting
• Scientific Research: Standardizing measurements across international studies
• Nutrition and Dieting: Tracking food portions and calorie counting with different measurement systems

Tips for Accurate Weight Conversions

• Use Exact Conversion Factors: For precision, use 2.20462262 (kg to lbs) and 0.45359237 (lbs to kg)
• Round Appropriately: Round to 1-2 decimal places for everyday use, more for scientific applications
• Understand Context: Body weight typically uses kilograms or pounds/stones; food uses grams/ounces
• Double-Check Units: Verify whether you need pounds (lbs) or stones when converting from kilograms
• Consider Precision Needs: Shipping requires precise weights; casual conversation allows rounding
• Learn Key Benchmarks: Memorize that 1 kg ≈ 2.2 lbs, 1 lb ≈ 0.45 kg, 1 stone = 14 lbs
• Use Digital Tools: For critical applications like medication dosing, use precise calculators

Common Weight Conversion Questions

How many pounds in a kilogram?

There are approximately 2.20462 pounds in one kilogram. This conversion factor is exact and internationally standardized. For quick mental math, you can use 2.2 as an approximation.

How many kilograms in a pound?

There are approximately 0.453592 kilograms in one pound. This means one pound is slightly less than half a kilogram. For quick estimates, 2 pounds equals roughly 1 kilogram.

How do I convert kg to stone?

To convert kilograms to stones, divide by 6.35029 (since 1 stone = 6.35029 kg). To express the result in stones and pounds, take the whole number as stones and multiply the decimal remainder by 14 to get pounds.

What's the difference between lbs and pounds?

There is no difference—"lbs" is simply the abbreviation for pounds. The abbreviation comes from the Latin "libra pondo," meaning "pound weight." Both "lb" and "lbs" are acceptable abbreviations.

How many ounces in a pound?

There are exactly 16 ounces in one pound. This relationship is used when more precision is needed than pounds alone provide. For example, 1.5 pounds equals 24 ounces (1.5 × 16).

Why Choose RevisionTown for Conversion Tools?

RevisionTown specializes in creating accurate, user-friendly calculators and educational resources for students, professionals, and anyone needing reliable measurement conversions. Our weight conversion calculator is designed by expert educators who understand both the mathematics and practical applications across multiple contexts.

Whether you're a student learning about measurement systems in IB, AP, GCSE, IGCSE curricula, a fitness enthusiast tracking progress, a traveler managing luggage limits, a cook following international recipes, or anyone needing accurate weight conversions, our calculator provides instant results with detailed breakdowns.

Our commitment to educational excellence extends beyond simple conversion—we provide context, formulas, comprehensive tables, and practical understanding. The weight converter exemplifies our approach: support for all major weight units, detailed stone and pound breakdowns, clear mathematical formulas, extensive reference tables, and tools that serve real needs in daily life, education, health, and international commerce.