Weight Converters

One pound is exactly 0.45359237 kilograms — a number fixed by international agreement, not rounded. One stone is 14 pounds, which works out to about 6.35029 kg, and a kilogram is roughly 2.20462 pounds. Those three anchors cover the vast majority of everyday conversions, from reading a British body-weight in stone to following a gym program written in pounds when your scale shows kilograms.

Technically, mass and weight are different things — mass is the amount of matter, weight is the gravitational force on it — but in everyday use the distinction rarely matters. The factors people need are the same either way. The 8 converters here handle the full range: small amounts in grams and milligrams for cooking or pharmacy, everyday quantities in pounds and ounces, and body-weight figures in kilograms and stone. Every converter runs in both directions.

Each result uses the exact factor rather than a truncated approximation. Start with the popular pairs below, or scroll through the full list to find the units you need.