Weight Converter

The Weight Converter is a free online weight converter that switches between kilograms, pounds, grams, ounces, stones, milligrams and metric tons instantly. It's built for anyone who needs to move between measurement systems without doing the arithmetic by hand — home cooks following a recipe written in ounces, travelers checking airline baggage limits given in kilograms, gym-goers tracking body weight recorded in stones, and shoppers comparing product weights listed in grams against a milligram-dosed supplement label. Type a value once and switch units as many times as you like without losing precision.

Common searches this tool answers directly include how many pounds are in a kilogram, what a package labeled in grams weighs in ounces, and how a stone-based body weight translates to kilograms for a doctor's chart. Because kg to lbs, pounds to kg and grams to ounces are all handled in one input, you can switch the source and target units freely instead of remembering a separate formula for each pair.

Every conversion uses the exact international avoirdupois definition — 1 pound = 0.45359237 kilograms exactly — rather than a rounded shortcut like 2.2 or 0.454. Ounces follow from the same standard (1 pound = 16 ounces, so 1 ounce = 28.349523125 grams), stones are defined as 14 pounds (1 stone = 6.35029318 kg), and milligrams and metric tons follow the standard metric scale (1,000 mg = 1 g, 1 metric ton = 1,000 kg). Using the exact legal definitions means a recipe conversion is just as trustworthy as one used for a shipping manifest or a lab measurement.

The conversion happens instantly as you type, and the swap button lets you reverse direction with one click. As with every tool on this site, all math runs locally in your browser — nothing you enter is transmitted or stored anywhere — so it works offline once the page has loaded and stays private by design.