Weight Converter
Convert pounds, ounces, stone, kilograms, grams, milligrams and tons in one go using the exact 1959 definitions — with a body-weight table and cooking equivalents.
Weight Converter: with the default inputs, kilograms is 68.038856 kg.
- Grams
- 68,038.8555 g
- Milligrams
- 68,038,855.5 mg
- Metric tons (tonnes)
- 0.068039 t
- Pounds
- 150 lb
- Ounces
- 2,400 oz
- Stone
- 10.714286 st
- US (short) tons
- 0.075 ton
Assumptions
- Ounces and pounds are avoirdupois, not troy.
- 'Ton' is the US short ton (2,000 lb); 't' is the metric tonne.
| From | Equals |
|---|---|
| 1 ounce | 28.3495 g |
| 1 pound | 16 oz = 453.592 g = 0.453592 kg |
| 1 stone | 14 lb = 6.35029 kg |
| 1 US ton (short) | 2,000 lb = 907.185 kg |
| 1 UK ton (long) | 2,240 lb = 1,016.05 kg |
| 1 gram | 0.035274 oz |
| 1 kilogram | 2.20462 lb = 35.274 oz = 0.157473 st |
| 1 metric ton (tonne) | 1,000 kg = 2,204.62 lb = 1.10231 US tons |
| lb | kg | stone |
|---|---|---|
| 100 | 45.4 | 7 st 2 lb |
| 110 | 49.9 | 7 st 12 lb |
| 120 | 54.4 | 8 st 8 lb |
| 130 | 59 | 9 st 4 lb |
| 140 | 63.5 | 10 st 0 lb |
| 150 | 68 | 10 st 10 lb |
| 160 | 72.6 | 11 st 6 lb |
| 170 | 77.1 | 12 st 2 lb |
| 180 | 81.6 | 12 st 12 lb |
| 190 | 86.2 | 13 st 8 lb |
| 200 | 90.7 | 14 st 4 lb |
| 220 | 99.8 | 15 st 10 lb |
| 250 | 113.4 | 17 st 12 lb |
How this is worked out
The formula
1 lb = 0.45359237 kg (exact, by definition since 1959) 1 oz = 1/16 lb = 28.349523125 g 1 st = 14 lb = 6.35029318 kg 1 US ton = 2,000 lb; 1 tonne = 1,000 kg value in unit B = value in kilograms ÷ (kilograms per unit B)
Open How it’s calculated above to see this worked through with your own numbers.
What you enter
- Weight
- A number.in lb · defaults to 150
What you get back
- Kilogramsmain answer
- Grams
- Milligrams
- Metric tons (tonnes)
- Pounds
- Ounces
- Stone
- US (short) tons
What this assumes
- Ounces and pounds are avoirdupois, not troy.
- 'Ton' is the US short ton (2,000 lb); 't' is the metric tonne.
About this calculator
Type a weight in any unit and see it in all the others. The pound has been defined as exactly 0.45359237 kg since 1959, so every conversion here is exact up to display rounding — no "2.2" approximations.
The units
Metric — milligram, gram, kilogram and tonne (metric ton, 1,000 kg) step by powers of ten. The kilogram is the SI base unit, defined since 2019 by fixing the Planck constant.
Avoirdupois (US and UK everyday weights) — 16 ounces to the pound, 14 pounds to the stone (UK body weight), and 2,000 pounds to the US "short" ton. The UK "long" ton is 2,240 lb; shipping and mining still occasionally use it. Troy ounces (31.1035 g), used for precious metals, are not the same as the avoirdupois ounces here.
Mass vs. weight
Strictly, kilograms and pounds measure mass, and "weight" is the force gravity exerts on it. Everyday usage treats them as the same thing and so does this converter; the distinction only matters if you leave the Earth.
Quick mental conversions
- Kilograms to pounds: double it and add 10%. 70 kg → 140 + 14 = 154 lb (exact: 154.3).
- Pounds to kilograms: halve it and take off 10%. 180 lb → 90 − 9 = 81 kg (exact: 81.6).
- Ounces to grams: multiply by 28. Grams to ounces: divide by 28.
- Stone to pounds: multiply by 14. 11 stone is 154 lb.
Body weight
Americans weigh themselves in pounds, Britons and the Irish in stone and pounds ("11 stone 6"), and almost everyone else in kilograms. The table below runs 100–250 lb in all three. Enter stone as a decimal (11 st 6 lb = 11.43 st) or convert the pounds first.
Cooking
Recipes often mix mass and volume. One ounce of flour is 28.35 g; a "cup" is a volume and its weight depends on the ingredient — use the cooking converter for cups-to-grams.
Frequently asked questions
▸How many pounds are in a kilogram?
2.20462 lb. A kilogram is a little more than two pounds and three ounces. To convert kg to lb multiply by 2.2046; to convert lb to kg multiply by 0.4536.
▸How many ounces are in a pound?
16 ounces (avoirdupois). One ounce is 28.35 grams, so a pound is 453.6 g. Troy ounces, used for gold and silver, are heavier at 31.1 g and 12 to the troy pound.
▸How many grams are in an ounce?
28.3495 g. A quarter-ounce is 7.09 g, a half is 14.17 g.
▸How much is a stone in pounds and kilograms?
14 pounds, or 6.35 kg. A weight of 12 stone 4 pounds is 172 lb or 78 kg.
▸What is the difference between a ton and a tonne?
A US (short) ton is 2,000 lb = 907 kg. A metric tonne is 1,000 kg = 2,205 lb. The UK long ton is 2,240 lb = 1,016 kg. This converter's 'ton' is the US short ton.
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