A weight converter moves a measurement between the metric system (kilograms, grams, tonnes) and the US/imperial system (pounds, ounces, stone). Like length, it works by converting your value into a single base unit — grams — and back out again. The pound is defined exactly as 0.45359237 kg, with 16 ounces to the pound and 14 pounds to the stone, so these conversions are exact and only rounded for display.
Reviewed: June 20, 2026 · Author: Naveen P N, Founder — AI Calculator · Verified against: the 1959 international avoirdupois pound definition, recomputed in code.
How the conversion works
Every unit has a fixed number of grams: a pound is 453.59237 g, an ounce is 28.349523 g, a stone is 6350.293 g. To convert, multiply your value by the "from" unit's grams-per-unit to reach grams, then divide by the "to" unit's grams-per-unit. The single base-unit pivot means one rule covers every pair — kg to lb, oz to g, stone to kg, and so on.
Worked example — 1 kilogram in other units
Scenario: convert 1 kilogram to other mass units.
One kilogram is 1000 grams, 2.20462 pounds or 35.274 ounces. The same rule handles the cases people search for most: 1 pound is 453.592 g (16 oz), 70 kg is 154.324 lb, and 1 stone is exactly 14 pounds or 6.35029 kg. The converter above shows your value in every supported unit at once, so you can read off whichever you need.
Frequently Asked Questions
2.20462 lb, since 1 lb = 0.45359237 kg exactly. 70 kg = 154.324 lb.
÷ 28.3495. 500 g = 17.637 oz. 16 oz = 1 lb = 453.592 g.
6.35029 kg (1 stone = 14 lb). 11 st ≈ 69.85 kg.
Strictly no, but kg/lb are used for both in daily life. This gives mass equivalents.
Yes — 1 lb = 0.45359237 kg, 16 oz/lb, 14 lb/stone, all exact since 1959.