Unit Conversion Guide
Published: April 2026 · Updated: April 2026
Converting between weight units is an everyday necessity — whether you're checking your BMI, shipping a package internationally, or following a recipe from another country. Our free online weight converter handles kilograms, pounds, ounces, stones, metric tons, and grams instantly. No formulas to memorize, no rounding errors. Just type, select, and get your answer. This comprehensive guide explains how weight conversions work, provides reference tables, and answers the most common questions.
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A weight converter (also called a mass converter) translates a measurement from one unit of mass or weight to another. While scientists distinguish between mass and weight, in everyday usage the terms are interchangeable. Different regions use different systems: most of the world uses the metric system (grams and kilograms), while the United States relies on US customary units (ounces and pounds), and the United Kingdom commonly uses stones and pounds for body weight.
This diversity creates constant friction. A European athlete weighs themselves in kilograms, but an American audience understands pounds. A manufacturer in China ships products in metric tons, but a US distributor needs short tons. Our converter bridges all these gaps in a single tool.
Type the number you want to convert. The tool accepts whole numbers and decimals — from 0.001 grams to millions of tons.
Pick the unit your value is currently in from the dropdown. Options include grams (g), kilograms (kg), milligrams (mg), pounds (lbs), ounces (oz), stones (st), metric tons (t), and short tons (US tons).
Select what you want to convert to. Results appear immediately with up to 6 decimal places of precision. You can keep switching target units without re-entering your value.
Stop guessing. Convert weights accurately in seconds.
Body weight is tracked in kilograms in most countries, but the US uses pounds and the UK uses stones and pounds. Understanding conversions helps you interpret health data, calculate BMI, and follow fitness programs from international trainers. For example, a doctor's recommendation of "lose 5 kg" is roughly equivalent to losing 11 pounds.
Recipes from the US list ingredients in ounces and pounds, while European recipes use grams and kilograms. A chocolate chip cookie recipe calling for 12 oz of chocolate chips? That's about 340 grams. Getting these conversions right can make or break a dish, especially in baking where precision matters.
International shipping rates depend on weight, and carriers use different units in different regions. A package weighing 2.5 kg ships from Germany, but US customs might require the weight in pounds (5.51 lbs). Accurate conversion prevents unexpected charges and shipping delays.
Material quantities are specified in different units depending on the country of origin. Steel beams might be rated in kilograms per meter internationally, but US projects use pounds per foot. Engineers and architects need reliable conversion to avoid costly mistakes.
Dosage calculations, chemical measurements, and laboratory results all depend on precise weight conversions. A medication dosage of 500 mg needs to be accurately understood regardless of what unit the patient or caregiver is familiar with.
How many pounds are in a kilogram?
One kilogram equals approximately 2.20462 pounds. For a quick mental estimate, you can double the kilogram value and add 10%. For precise results, use our weight converter.
What is a stone in weight?
A stone is a British unit of weight equal to 14 pounds or approximately 6.35 kilograms. It's primarily used in the UK and Ireland for measuring body weight. Someone who weighs "11 stone" weighs 154 pounds or about 69.9 kg.
What's the difference between a metric ton and a short ton?
A metric ton (tonne) equals 1,000 kilograms (about 2,204.6 lbs). A short ton (US ton) equals 2,000 pounds (about 907.2 kg). There's also a long ton (UK ton) of 2,240 pounds, though it's rarely used today. The difference between a metric ton and a short ton is roughly 204 pounds — significant enough to matter in shipping and trade.
How do I convert ounces to grams for cooking?
Multiply ounces by 28.3495 to get grams. For common cooking measurements: 1 oz ≈ 28g, 4 oz ≈ 113g, 8 oz ≈ 227g, 16 oz ≈ 454g. Our converter handles any value with full precision.
Is weight the same as mass?
In physics, mass is the amount of matter in an object (measured in kg), while weight is the force of gravity on that mass (measured in newtons). In everyday language, however, "weight" is used for both. Our converter treats them interchangeably, which is standard practice for non-scientific applications.
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