Converters
Weight Converter
Convert kilograms, pounds, ounces, and stones.
Result
Enter your numbers and press Calculate to see the result.
Calculating…
How weight conversion works
All weights are converted through kilograms using exact definitions — the international pound has been fixed at 0.45359237 kg since 1959, and every other unit derives from it. The only rounding is the precision you pick.
result = value × kilograms(from) ÷ kilograms(to)
Exact factors
| Unit | In kilograms |
|---|---|
| 1 pound (lb) | 0.45359237 kg |
| 1 ounce (oz) | 0.028349523 kg (≈ 28.35 g) |
| 1 stone (st) | 6.35029318 kg (14 lb) |
| 1 metric ton (t) | 1,000 kg |
Worked examples
- 10 kg to pounds — 10 ÷ 0.45359237 = 22.05 lb.
- 165 lb to kilograms — 165 × 0.45359237 = 74.84 kg.
- 12 stone to kilograms — 12 × 6.35 = 76.20 kg.
Mass vs. weight
Strictly speaking, kilograms and pounds measure mass — how much matter an object contains — while weight is the force gravity exerts on that mass. In everyday use the two words are interchangeable because gravity is effectively constant across the Earth's surface, so a converter that maps units through kilograms gives the answer people expect on a bathroom scale or a shipping label.
Quick reference
For fast estimates: 1 kg ≈ 2.2 lb, 1 lb ≈ 454 g, 1 oz ≈ 28 g, and 1 stone = 14 lb ≈ 6.35 kg. So 70 kg is roughly 154 lb or 11 stone. The calculator uses the exact 0.45359237 kg pound definition for precise results, which matters most for recipes, medication, and freight.
Converting body measurements for a health check? The BMI calculator accepts imperial units directly. For all other unit types, see the unit converter.
Weight Converter — frequently asked questions
How do I convert kilograms to pounds?
Multiply by about 2.20462, since a pound is defined as exactly 0.45359237 kg. So 10 kg is roughly 22.05 lb.
What is a stone in weight?
A stone is a British unit equal to 14 pounds, or about 6.35 kg. Body weight in the UK is commonly given in stones and pounds — for example, 11 st 4 lb is about 71.7 kg.
How many ounces are in a pound?
There are 16 ounces in a pound. One ounce is about 28.35 grams.
Is this converting weight or mass?
Strictly speaking these are units of mass, which is what scales report in everyday use. The distinction only matters in physics contexts, where weight is mass times gravity.