Convert kg, pounds, ounces, grams, stones. Free weight converter.
Weight and mass conversions are essential for cooking, shipping, fitness tracking, and international commerce. This converter supports seven common units: kilograms, grams, milligrams, pounds, ounces, stones, and metric tonnes. It handles the conversions used most frequently in daily life, such as converting recipe ingredients between grams and ounces, tracking body weight across metric and imperial scales, or determining shipping weights for international packages. All conversions use the internationally standard avoirdupois pound (453.592 grams), which is the pound used in everyday commerce in the United States and United Kingdom.
Choose your source unit and target unit, enter a value, and the result appears instantly. The converter stores all units as factors relative to one kilogram. Your input is multiplied by the source factor to get kilograms, then divided by the target factor to get the desired unit. This two-step process ensures accuracy across all unit combinations.
Home cooks convert recipe quantities between grams and ounces. Fitness enthusiasts track body weight in their preferred unit system. International shippers calculate package weights for customs declarations. Pharmacists verify medication dosages in milligrams. Jewelers work with gram and ounce measurements for precious metals. Travelers check luggage weight limits in either kilograms or pounds.
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One kilogram equals approximately 2.20462 pounds. For quick mental math, multiply kilograms by 2.2. To convert pounds to kilograms, divide by 2.2 or multiply by 0.4536 for more precision.
A stone is a unit of weight equal to 14 pounds or approximately 6.35 kilograms. It is commonly used in the United Kingdom and Ireland for expressing body weight. For example, a person weighing 154 pounds would be described as weighing 11 stone in British English.
Mass measures the amount of matter in an object and is constant regardless of location. Weight measures the gravitational force acting on that mass and varies by location. On Earth, the distinction rarely matters for everyday calculations, but in scientific contexts, mass is measured in kilograms while weight is measured in newtons.
One ounce equals approximately 28.35 grams. For cooking, you can round to 28 grams per ounce without significantly affecting recipes. For baking, where precision matters more, use the exact factor of 28.3495 grams per ounce.
A troy ounce equals approximately 31.10 grams, while a regular avoirdupois ounce equals 28.35 grams. Troy ounces are used exclusively for weighing precious metals like gold, silver, and platinum. When you see gold priced per ounce, it always refers to troy ounces.