Weight converter (mass)
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Convert to the base unit (kilogram): 1 × 0.45359237 = 0.45359237.
- Divide by the size of the target unit: 0.45359237 ÷ 1 = 0.45359237 kg.
| Unit | Equals |
|---|---|
| kilogram (kg) | 1 kg = 1 kilograms |
| gram (g) | 1 g = 0.001 kilograms |
| milligram (mg) | 1 mg = 0.000001 kilograms |
| tonne (metric ton) (t) | 1 t = 1,000 kilograms |
| pound (lb) | 1 lb = 0.45359237 kilograms |
| ounce (oz) | 1 oz = 0.02834952313 kilograms |
| stone (st) | 1 st = 6.35029318 kilograms |
| short ton (US) (short ton) | 1 short ton = 907.18474 kilograms |
| long ton (UK) (long ton) | 1 long ton = 1,016.046909 kilograms |
How to use it
The kilogram is the base. The pound is exactly 0.45359237 kg, the ounce is one sixteenth of a pound (0.028349523125 kg), a stone is 14 pounds, a US short ton is 2,000 pounds and a UK long ton is 2,240 pounds.
Strictly, kilograms and pounds measure mass, while weight is the force of gravity on it; everyday scales and recipes use the words interchangeably, and so does this page.
Frequently asked questions
How many kilograms are in a pound?
1 lb = 0.45359237 kg exactly.
How many ounces are in a pound?
16 ounces.
How many pounds are in a stone?
14 pounds.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.