How to use the weight converter
- Type a number in the left box and choose the unit you are converting from.
- Choose the unit you want to convert to on the right — the answer appears instantly. You can also type in the right-hand box to convert the other way.
- Press ⇄ to swap the units, or Copy result to paste the answer elsewhere. The table underneath shows your value in every weight unit at once.
Results are calculated with exact, internationally agreed conversion factors and shown to up to ten significant figures, so they are suitable for homework, cooking, travel, engineering and shopping alike. Bookmark a conversion by adding ?v=10&from=…&to=… to the page address.
Common weight conversions
| From | To | Multiply by |
|---|---|---|
| Pounds (lb) | Kilograms | 0.45359237 |
| Kilograms | Pounds | 2.20462 |
| Ounces (oz) | Grams | 28.3495 |
| Grams | Ounces | 0.035274 |
| Stones (st) | Kilograms | 6.35029 |
| US tons | Kilograms | 907.185 |
| Metric tons | Pounds | 2,204.62 |
Quick estimate: to turn kilograms into pounds, double the number and add 10%. 70 kg → 140 + 14 = 154 lb (exact: 154.3 lb).
Body weight chart
| Pounds | Kilograms | Stones & pounds |
|---|---|---|
| 120 lb | 54.4 kg | 8 st 8 lb |
| 140 lb | 63.5 kg | 10 st 0 lb |
| 160 lb | 72.6 kg | 11 st 6 lb |
| 180 lb | 81.6 kg | 12 st 12 lb |
| 200 lb | 90.7 kg | 14 st 4 lb |
| 220 lb | 99.8 kg | 15 st 10 lb |
Three kinds of “ton”
- US (short) ton = 2,000 lb = 907.18 kg — used in the United States.
- UK (long) ton = 2,240 lb = 1,016.05 kg — historic British unit.
- Metric ton (tonne) = 1,000 kg = 2,204.6 lb — used worldwide in trade and shipping.
Weight vs mass
Strictly, kilograms and pounds measure mass — the amount of matter — while weight is the force of gravity on that mass. In everyday life, and on scales, the two are treated as the same, and this converter follows that convention.
Shipping and cooking
Couriers bill by the greater of actual and dimensional weight — see the dimensional weight calculator. In the kitchen, 1 oz ≈ 28 g and 1 lb ≈ 454 g; a US “stick” of butter weighs 4 oz (113 g).
Frequently asked questions
How many pounds are in a kilogram?
About 2.20462 lb.
How many grams are in an ounce?
28.3495 grams.
How many pounds are in a stone?
14 pounds (6.35 kg).
Is a ton 1,000 kg?
A metric ton (tonne) is 1,000 kg. A US ton is 2,000 lb (907 kg) and a UK ton is 2,240 lb (1,016 kg).