Convert weight and mass measurements between kilograms, pounds, ounces, grams, stones, and milligrams instantly.
Weight and mass conversions are essential for cooking recipes, shipping packages, scientific laboratory experiments, and tracking body weight. Our free online Weight Converter allows you to translate values between milligrams, grams, kilograms, ounces, pounds, and stones instantly in real time.
The tool uses precise scientific conversion factors (such as 1 kilogram = 2.20462 pounds, and 1 stone = 14 pounds) to perform scaling. Simply select your starting unit, enter your value, and select your target unit to get the calculated result with high decimal precision.
To convert kilograms to pounds, multiply the kilogram value by 2.20462. For example, 70 kg is approximately 154.32 lbs. To convert pounds to kilograms, multiply the pounds value by 0.453592.
The stone (st) is a British unit of weight equal to exactly 14 pounds (approx. 6.35 kilograms). It is commonly used in the UK and Ireland to express body weight.
There are approximately 28.35 grams in one standard ounce (avoirdupois ounce). In troy ounces (used for precious metals), there are approximately 31.10 grams.
Mass is the amount of matter in an object and remains constant everywhere. Weight is the force exerted on that mass by gravity, which changes depending on the gravitational pull (e.g., an object weighs less on the moon than on earth).