What This Easy Weight Converter Does

An easy weight converter solves a common problem: you have a value in one unit, but the recipe, label, assignment, shipping form, gym program, or product page uses another unit. Instead of searching for one isolated formula, this calculator lets you move between the everyday units people actually meet: kilograms, grams, milligrams, pounds, ounces, stones, metric tons, US short tons, imperial tons, catty, and tola.

The page is designed for quick, ordinary conversions. It is not trying to replace a lab balance, a customs declaration system, or a certified trade instrument. For normal reading and planning, though, it gives a clear answer and shows the arithmetic behind the answer. That matters because weight conversions are easy to misuse when a number looks plausible but the unit is wrong.

The calculator uses grams as the middle step. This is the most practical approach because gram values are well known for metric units, pounds, ounces, stones, and tons. The same method also keeps the result consistent when converting between two non-metric units. For example, converting pounds to ounces can be done directly by multiplying by 16, but the converter can also convert pounds to grams and then grams to ounces. Both paths produce the same result when the same factors are used.

If you need a broader page for everyday mass units, the general weight converter is useful. If you are navigating many tool categories, the unit converters page is a better starting point. This page has a narrower job: keep common weight conversions fast, transparent, and easy to understand.

How To Use The Converter

Start with the number you already have. If a package label says 2.5 kg, type 2.5. If a recipe says 12 ounces, type 12. If a school problem gives 750 milligrams, type 750. Do not type the unit into the number box, because the unit is selected separately from the dropdown.

Next, choose the source unit in the "From unit" field. This tells the calculator how to interpret the number. A value of 10 means something very different if the source unit is grams, pounds, stones, or metric tons. The calculator cannot know that context unless you choose it.

Then choose the target unit in the "To unit" field. This is the unit you want the answer in. If you are comparing a US recipe with a metric kitchen scale, you may convert ounces to grams. If you are reading a fitness plan from another country, you may convert kilograms to pounds. If you are checking a UK body weight entry, you may convert stones to pounds or kilograms.

The output box updates as you type. The result line gives the readable conversion, and the formula line shows the method. If the source and target units are reversed, use the swap button. If you want to paste the result into notes, a spreadsheet, or a message, use the copy button.

For quick work, round only at the end. If you convert 2.2 pounds to kilograms and then use that rounded kilogram value in another conversion, small rounding differences can build up. This does not matter for rough estimates, but it can matter in recipes, shipping, medication education examples, and science homework. Keep a few extra decimal places until you know how much precision is actually needed.

The Conversion Formula

The converter uses a two-step formula. First, it converts the starting value into grams. Second, it divides that gram value by the number of grams in the target unit. This method works because every unit in the tool has a fixed gram factor.

For example, suppose you want to convert 5 pounds to kilograms. One pound is 453.59237 grams, so 5 pounds is 2267.96185 grams. One kilogram is 1000 grams, so 2267.96185 grams divided by 1000 equals 2.26796185 kilograms. Rounded for everyday use, 5 pounds is about 2.268 kg.

The same method works for ounces to grams. One ounce is 28.349523125 grams. If you have 8 ounces, multiply 8 by 28.349523125 to get 226.796185 grams. If you are cooking, you may write that as about 227 g. If you are doing a math problem, keep more decimals until the final answer.

For pounds to ounces, the shortcut is simple: multiply pounds by 16. The gram method still supports it. One pound is 453.59237 grams and one ounce is 28.349523125 grams. Dividing 453.59237 by 28.349523125 gives 16. That is why 2 pounds equals 32 ounces, 3.5 pounds equals 56 ounces, and 0.25 pounds equals 4 ounces.

For stones to pounds, the traditional relationship is also simple: 1 stone equals 14 pounds. The calculator includes stone because body weight, sports references, and older UK-style records often use it. If a person weighs 11 stone, that equals 154 pounds. If you want the metric value, convert 154 pounds to kilograms or convert stone directly to kilograms.

Weight Units Included In This Tool

The table below explains how each unit is handled. The gram factor is the key number used by the converter. Some units are exact within modern definitions, while a few traditional market units can vary by region. For those traditional units, the calculator follows the factor shown in the table and the article explains the practical limitation.

For daily work, kilograms, grams, pounds, and ounces cover most conversions. Stones are helpful for body weight. Metric tons, US short tons, and imperial tons are helpful when the number is too large for pounds or kilograms to be convenient. Milligrams are useful when the object is too small for grams to express neatly. Catty and tola are included because they appear in market, jewelry, and regional trading contexts, but those units should be used carefully when legal or commercial standards matter.

Metric Weight Conversions

The metric system is usually the easiest system for weight conversion because it is built on powers of ten. A kilogram is 1000 grams. A gram is 1000 milligrams. A metric ton is 1000 kilograms. Once you know the prefixes, most conversions are just decimal movement.

To convert kilograms to grams, multiply by 1000. A 2 kg bag of flour is 2000 g. A 0.75 kg package is 750 g. A 0.125 kg ingredient amount is 125 g. This is why metric kitchen scales are convenient: the relationship between kilograms and grams is direct and predictable.

To convert grams to kilograms, divide by 1000. A 500 g package is 0.5 kg. A 250 g packet is 0.25 kg. A 1500 g bag is 1.5 kg. If you often move between those two units, the dedicated grams to kilograms conversion page can be useful for examples, while kilograms to grams conversion helps when you are starting from kilograms.

To convert grams to milligrams, multiply by 1000. A 0.5 g sample is 500 mg. A 2 g amount is 2000 mg. To convert milligrams to grams, divide by 1000. A 750 mg amount is 0.75 g. You can also check focused pages for grams to milligrams conversion and milligrams to grams conversion when you want more practice with very small values.

To convert metric tons to kilograms, multiply by 1000. A 3 metric ton shipment is 3000 kg. To convert kilograms to metric tons, divide by 1000. A 250 kg load is 0.25 t. For larger quantities, the dedicated metric tons to kilograms conversion page gives a focused route from tons to kg, and kilograms to metric tons conversion covers the reverse direction.

Imperial And US Customary Weight Conversions

Imperial and US customary weight conversions need more attention because they are not based on powers of ten. Pounds and ounces are common in the United States, while stones are still used for body weight in some UK and Ireland contexts. Tons also create confusion because a US short ton, an imperial long ton, and a metric ton are three different quantities.

One pound equals 16 ounces. That is the most important everyday imperial relationship. If a recipe uses half a pound, that is 8 ounces. If a package weighs 2.25 pounds, that is 36 ounces. If you need a dedicated page for the direction from pounds into ounces, use pounds to ounces conversion. For the reverse direction, ounces to pounds conversion handles ounces back to pounds.

One stone equals 14 pounds. That means 10 stone equals 140 pounds, 12 stone equals 168 pounds, and 15.5 stone equals 217 pounds. When someone writes body weight as "11 st 4 lb," convert the stone part first: 11 stone is 154 pounds, then add 4 pounds for a total of 158 pounds. The focused stones to pounds conversion page is useful for that style of reading, while pounds to stones conversion helps when a weight is already written in pounds.

Tons need unit names. A US short ton is 2000 pounds. An imperial long ton is 2240 pounds. A metric ton is 1000 kilograms, which is about 2204.62 pounds. A number labeled only as "ton" can be ambiguous, so always check the country, industry, or document. If you compare a US freight quote with an international shipping document, confirm whether the number means short tons or metric tons before making a decision.

For large conversions between metric tons and pounds, use the main calculator here or the focused metric tons to pounds conversion page. For the reverse direction, pounds to metric tons conversion keeps the calculation centered on pounds as the starting point.

Kilograms To Pounds And Pounds To Kilograms

Kilograms to pounds is probably the most common weight conversion for students, travelers, athletes, and shoppers. One kilogram equals about 2.20462 pounds. To estimate quickly, multiply kilograms by 2.2. To calculate more accurately, multiply by 2.2046226218. The easy converter uses the more precise gram-based relationship and then rounds the displayed result for readability.

For example, 10 kg is about 22.0462 lb. A 20 kg suitcase is about 44.0925 lb. A 70 kg body weight is about 154.324 lb. A 2.5 kg bag of rice is about 5.51156 lb. When you only need a rough mental estimate, 20 kg is about 44 lb and 70 kg is about 154 lb. When you are checking an airline bag limit, use the calculator rather than a rough estimate.

The reverse direction is pounds to kilograms. One pound equals exactly 0.45359237 kilograms. To estimate quickly, divide pounds by 2.2. To calculate accurately, multiply pounds by 0.45359237. A 50 lb bag is about 22.6796 kg. A 150 lb body weight is about 68.0389 kg. A 5 lb item is about 2.26796 kg.

If you need one focused tool for this pair, the kg to lbs converter is a direct option. You can also use the dedicated kilograms to pounds page when the starting value is in kilograms, or pounds to kilograms conversion when the starting value is in pounds.

Ounces, Grams, And Cooking Measurements

Ounces and grams appear constantly in recipes, nutrition labels, coffee brewing, baking, supplement servings, and small product listings. One ounce equals 28.349523125 grams. Because most kitchen scales can show grams, converting ounces to grams is often the easiest way to follow a recipe with more precision.

Suppose a recipe asks for 8 oz of chocolate. Multiply 8 by 28.349523125 and you get 226.796185 g. In a kitchen, that becomes about 227 g. If a recipe asks for 4 oz of butter, that is about 113.398 g. Many bakers round this to 113 g or use a familiar stick-of-butter reference depending on country and packaging.

Converting grams to ounces is useful when a product label is metric but a recipe or customer expects ounces. Divide grams by 28.349523125. A 100 g chocolate bar is about 3.5274 oz. A 250 g bag is about 8.8185 oz. A 500 g package is about 17.637 oz, which is a little more than 1 pound because 1 pound is 16 ounces.

For focused practice, use ounces to grams conversion when you begin with ounces, and grams to ounces conversion when you begin with grams. If your starting value is pounds but the recipe is in grams, pounds to grams conversion gives a direct path. If your starting value is grams but you need pounds, grams to pounds conversion is the natural reverse.

One practical rule for cooking is to distinguish weight ounces from fluid ounces. Ounces in this converter are weight ounces. Fluid ounces measure volume, not mass. Eight fluid ounces of water has a mass close to 8.35 ounces by weight, but eight fluid ounces of honey, oil, flour, or milk will not all weigh the same. Use this converter for weight values, not cup, tablespoon, or fluid ounce volume values.

Stones, Pounds, And Body Weight

Stone is a traditional weight unit used mainly for human body weight in some countries. It is not difficult once you remember that 1 stone equals 14 pounds. The difficulty is usually in mixed notation. A weight may be written as 12 st 6 lb. That means 12 stone plus 6 pounds, not 12.6 stone.

To convert mixed stone notation into pounds, multiply the stone number by 14 and then add the remaining pounds. For 12 st 6 lb, calculate 12 x 14 = 168, then add 6, giving 174 lb. To convert that to kilograms, multiply 174 by 0.45359237, giving about 78.925 kg.

To convert pounds back into stones, divide pounds by 14. A value of 180 lb is 12.8571 stone. In mixed notation, that is 12 stone with 12 pounds left over, because 12 x 14 = 168 and 180 - 168 = 12. The decimal version is useful for calculation; the mixed version is often easier to read in everyday conversation.

When comparing body weight records, be consistent. Do not compare 75 kg with 11 stone without converting them to the same unit. Do not round too aggressively before calculating body weight changes either. A change of 1 kg is about 2.205 lb, while a change of 1 stone is 14 lb. The scale of each unit changes the way progress looks on paper.

Tons: Metric Ton, US Short Ton, And Imperial Ton

The word "ton" is one of the easiest ways to make a weight conversion mistake. A metric ton is 1000 kg. A US short ton is 2000 lb. An imperial ton, also called a long ton, is 2240 lb. These are close enough to confuse readers but different enough to matter in shipping, construction, agriculture, mining, waste management, and industrial pricing.

A metric ton is about 2204.62 pounds. A US short ton is about 907.185 kg. An imperial ton is about 1016.047 kg. If a quote says 10 tons and the document is from a US domestic supplier, it may mean 10 short tons. If an international report says 10 tonnes or 10 metric tons, it means 10000 kg. If an older British or maritime reference says long tons, it means a larger unit again.

The easy weight converter includes all three because real documents may use any of them. The safest habit is to write the full unit name in your notes: metric ton, US short ton, or imperial ton. If you only write "ton," you may forget which factor you used when you check the calculation later.

Large unit conversions often need fewer decimal places than small unit conversions. If you convert 3 metric tons to pounds, the answer is about 6613.87 lb. Rounding to 6614 lb may be fine for a quick estimate. If you are pricing material by weight, calculating freight, or checking official reporting, use the full precision required by the system you are working in.

Catty And Tola: Traditional Units Need Context

Catty and tola are included because users sometimes meet them in market, jewelry, and regional trade settings. They are useful to convert, but they need more context than kilograms or pounds. Traditional units may have different legal or customary definitions depending on location, product, and industry.

This converter uses 1 catty = 604.78982 g. That is suitable for the version of the catty used in some trading contexts, but it is not a universal definition for every region. If a market, customs form, or official document specifies a different catty value, use that local standard. The same advice applies when a seller uses a traditional unit informally rather than as a legally defined weight.

This converter uses 1 tola = 11.6638 g. Tola is commonly associated with precious metals and jewelry in South Asian contexts. If you are estimating jewelry weight, the conversion is useful. If you are buying, selling, or valuing metals, use the exact standard specified by the jeweler, marketplace, or regulatory authority, and confirm whether the quoted weight includes stones, settings, packaging, or only metal.

The main lesson is simple: traditional units can be meaningful, but the source must be clear. For homework or approximate reading, the converter's factors are enough. For trade, taxes, jewelry valuation, or legal reporting, confirm the local definition before relying on a converted number.

Weight Versus Mass In Plain English

In everyday language, people use "weight" for almost everything measured on a scale. In physics, weight and mass are different. Mass is the amount of matter in an object. Weight is the force caused by gravity acting on that mass. A kilogram is a unit of mass. A newton is a unit of force. A bathroom scale, kitchen scale, or luggage scale is usually calibrated so people can read mass-like units such as kilograms or pounds under normal Earth gravity.

For everyday conversions, it is normal to say weight converter. If a bag is labeled 5 kg, a shopper asks how many pounds it weighs. If a suitcase is limited to 50 lb, a traveler asks how many kilograms that is. This page follows that everyday language because it is the phrase people use when converting scale readings and product labels.

For physics classes, be more precise. If the problem asks for force, a pounds-to-kilograms conversion is not enough. You may need mass, gravitational field strength, and force in newtons. This easy weight converter is for mass and weight unit labels, not for solving force problems directly.

That distinction also explains why the tool does not include newtons. Newtons are force units, while kilograms, grams, pounds, ounces, and stones are used here as mass or everyday weight units. Mixing those categories without a physics formula would create misleading answers.

Rounding: How Many Decimals Should You Keep?

Rounding is not just a formatting choice. It affects how usable the answer is. Too many decimal places make an everyday answer harder to read. Too few decimal places can make the answer inaccurate for the task. The right amount depends on the context.

For cooking, whole grams are often enough. If a recipe converts 4 oz to 113.398 g, using 113 g is usually fine. For baking formulas or repeated scaling, you may keep one decimal place. For large batches, rounding each ingredient too early can change the balance of the recipe, so convert and scale carefully.

For luggage and shipping, keep enough precision to avoid crossing a limit. If an airline limit is 23 kg, that is about 50.7063 lb. A suitcase reading 50.8 lb may be over the metric limit even if it looks close to 50 lb. A small rounding difference can become a fee or a repacking problem.

For schoolwork, follow the teacher's instruction. Some assignments ask for three significant figures, some ask for two decimal places, and some ask for exact formula work before rounding. If no instruction is given, include the formula and show a reasonably rounded answer.

For health and fitness logs, consistency matters more than excessive precision. If you track body weight in kilograms, keep kilograms. If you track in pounds, keep pounds. If you switch units, convert once and note the change so a graph does not look like a sudden body change when it is actually a unit change.

Common Mistakes To Avoid

Everyday Examples

Example 1: Airline luggage

An airline gives a checked bag limit of 23 kg, but your luggage scale reads pounds. Convert 23 kg to pounds: 23 x 2.2046226218 = 50.7063 lb. A bag at 50 lb is under that limit, but a bag at 51 lb may be over. This is a case where a rough 2.2 estimate is helpful, but the exact converter is safer near the boundary.

Example 2: A recipe from another country

A recipe asks for 6 oz of cheese, but your scale reads grams. Convert 6 oz to grams: 6 x 28.349523125 = 170.097 g. You can use about 170 g. If the ingredient is a spice or leavening agent, smaller rounding differences may matter more than they do for cheese, vegetables, or chocolate chunks.

Example 3: Gym plates and dumbbells

A training plan says 60 kg, but your gym labels plates in pounds. Convert 60 kg to pounds: 60 x 2.2046226218 = 132.277 lb. In a gym, the nearest practical load depends on available plates. You may use 130 lb, 132.5 lb, or 135 lb depending on equipment, but knowing the exact conversion helps you choose intentionally.

Example 4: Small supplement label

A label lists 0.75 g and you want milligrams. Convert grams to milligrams by multiplying by 1000: 0.75 g = 750 mg. This is a metric conversion, so it is cleaner than most imperial conversions. Be careful not to confuse 0.75 g with 0.75 mg; those values differ by a factor of 1000.

Example 5: Bulk material

A supplier quotes 4 metric tons of material, but an older spreadsheet expects pounds. Convert metric tons to pounds: 4 metric tons = 4000 kg, and 4000 kg is about 8818.49 lb. If another supplier quotes 4 US short tons, that is exactly 8000 lb, so the two offers are not the same quantity.

Choosing The Right Weight Tool

RevisionTown has more than one converter because different users need different levels of detail. This easy weight converter is best when you want a clean answer for everyday units and a short formula explanation. It should be the page you use for quick kg, lb, oz, g, mg, stone, and ton checks.

The general weight converter for kg, pounds, and stone is useful when you are specifically comparing those common body-weight and household units. The broader converters page is useful when the task is not just weight, such as length, temperature, time, or area.

The advanced weight converter should not be treated as a replacement for this page. It has a different job. Use it when you need technical or less common units. Use this page when you want the common units quickly and without extra choices that slow down the calculation.

This separation helps readers choose the right tool quickly. A student doing homework on grams and kilograms does not need a long list of rare mass units. A professional or advanced learner may need those units. Keeping the easy page simple makes it easier to finish the ordinary conversion correctly.

Practical Ways To Use Weight Conversion

Weight conversion is not just a classroom exercise. It is a small decision-making tool. The same calculation can help someone pack a suitcase, compare food prices, follow a baking recipe, interpret a fitness plan, read a product specification, or check a bulk material quote. The key is to connect the conversion to the decision you are actually making.

Travel and luggage

Airline baggage limits are often written in kilograms outside the United States and in pounds in US-facing material. A traveler who owns a luggage scale set to pounds may still need to follow a 20 kg, 23 kg, or 32 kg limit. This is a classic case for converting kilograms to pounds before leaving home. Do not pack exactly to the rounded limit if your scale is not highly accurate. If 23 kg converts to about 50.706 lb, leaving the bag at 49.5 or 50 lb gives a small buffer for scale differences at the airport.

The reverse can also happen. A suitcase tag, shipping receipt, or luggage scale might show 48 lb, while the airline app discusses kilograms. Convert 48 lb to kilograms and you get about 21.772 kg. If the airline limit is 23 kg, that looks safe. If the limit is 20 kg, the same bag is overweight. Unit conversion changes the interpretation of the number; it does not change the bag.

Cooking, baking, and grocery comparison

Recipes are one of the best reasons to convert weight rather than volume. A cup of flour can vary depending on how it is scooped, but grams give a more consistent measurement. If a US recipe gives ounces and your scale reads grams, convert the ounces first, then weigh the ingredient. If a product label is in grams and a recipe calls for ounces, convert the label amount so you can decide whether one package is enough.

Grocery price comparison also benefits from conversion. One product may be sold as 12 oz, another as 400 g, and another as 1 lb. Before deciding which is cheaper, convert all package sizes into one unit and compare price per gram, price per ounce, or price per pound. This avoids the common mistake of choosing the bigger-looking number rather than the better value.

School, science, and homework

For students, the most important habit is showing the unit through every step. A calculation that says "500 divided by 1000 = 0.5" is mathematically incomplete until the units are included. The clearer version is "500 g divided by 1000 = 0.5 kg." This protects the answer from being copied into the wrong unit later.

Science work also depends on scale. A lab activity might use grams and milligrams, while a real-world example uses kilograms or metric tons. If a value looks unusually large or small after conversion, pause and check whether you moved in the correct direction. Converting from grams to milligrams should make the number larger. Converting from grams to kilograms should make it smaller.

Fitness, health tracking, and sports equipment

Fitness plans often move between kilograms and pounds because equipment varies by country and gym. A barbell program written in kilograms may need to be loaded with pound plates. A dumbbell rack may show pounds while a training app uses kilograms. Convert the target weight, then choose the nearest realistic equipment option. The goal is not always to match the converted value exactly; the goal is to make a sensible training choice with the available weights.

For body weight logs, choose one unit and stay consistent. If you record kilograms on Monday and pounds on Tuesday without labeling them clearly, a graph or note can become misleading. If you must switch units, write both values for a few entries so the transition is obvious. This is especially helpful when sharing progress with a coach, doctor, or family member who uses a different system.

Online shopping and product specifications

Product pages often mix unit systems. A camera accessory may list grams, a backpack may list pounds, and a kitchen appliance may list kilograms. Convert the weight into a familiar unit before deciding whether the product is practical. A 1.8 kg laptop is about 3.97 lb. A 12 oz bottle is about 340 g. A 25 lb item is about 11.34 kg. The converted number often makes the product easier to imagine.

Be careful with shipping weight and product weight. A product may weigh 2 lb, while the boxed shipping weight is 3.4 lb. If you are checking whether an item can be carried, stored, mailed, or packed, use the weight that matches the decision. Product weight is useful for handling. Shipping weight is useful for postage and logistics.

Bulk goods and business estimates

Bulk weight conversions are useful for materials such as grain, soil, stone, metal, fertilizer, waste, and packaged inventory. Here the difference between ton types becomes more important. A quote in metric tons should not be compared directly with a quote in US short tons unless both are converted to the same unit. For a rough check, remember that a metric ton is about 2204.62 lb, while a US short ton is 2000 lb.

When a cost is given per ton, verify the ton definition before calculating total cost. If one supplier quotes per metric ton and another quotes per short ton, the price per "ton" is not automatically comparable. Convert the unit first, then compare price per kilogram or price per pound. This is a better business habit than trying to remember which ton is larger during a call or while reading an invoice.

Manual Conversion Reference

The calculator is faster than doing everything by hand, but knowing the common relationships helps you check whether an answer is reasonable. If the converter says 1 kg is 0.22 lb, you know something is wrong because 1 kg should be a little more than 2 lb. If it says 1 lb is 45 kg, that is also impossible for an everyday conversion.

A good manual check is to ask whether the target unit is larger or smaller than the source unit. If you convert kilograms to grams, the number should get larger because grams are smaller units. If you convert grams to kilograms, the number should get smaller because kilograms are larger units. If you convert pounds to ounces, the number should get larger because ounces are smaller. This simple direction check catches many unit mistakes.

When Exactness Matters

Some conversions are casual. If you are discussing a 5 kg bag of rice, saying it is about 11 lb is usually fine. Other conversions have real consequences. Luggage weight can trigger fees. Shipping weight can affect cost and customs paperwork. Ingredient weight can change a recipe. Medication education examples can become unsafe if a unit is misread. Precious metal weights can affect price.

When exactness matters, identify the source unit, write it down, and convert with enough precision. Do not rely on memory alone. Do not switch between rounded values and exact values without noticing. If a document has a required rounding rule, follow that rule rather than a generic rule from another context.

For official or regulated work, use the calculator as a checking aid, not as the only authority. Certified scales, official conversion standards, industry documents, customs rules, and local regulations may control how weights must be declared. This is especially important for trade units, bulk goods, pharmaceuticals, and precious metals.

For learning and everyday planning, the converter is intentionally transparent. The formula line makes it easier to see why the answer appears, which helps you avoid blind copying. If you understand that 1 lb is 453.59237 g and 1 kg is 1000 g, then a pounds-to-kilograms answer near half the pound value makes sense.

FAQ

Final Guidance

Use this easy weight converter when you want a fast, readable conversion between the units most people meet in daily life. Type the value, choose the source unit, choose the target unit, and check the formula line if you need to understand the calculation. For most practical tasks, that is enough.

When a conversion affects money, safety, official reporting, or regulated trade, slow down and verify the unit definition. The difference between pounds and kilograms, ounces and fluid ounces, or metric tons and US short tons can be much larger than it looks at first glance.

The strongest habit is to write the unit every time you write the number. A value like 25 is meaningless until it becomes 25 g, 25 kg, 25 lb, or 25 oz. Clear units make clear calculations, and clear calculations prevent the most common weight conversion errors.