Weight Converter
Kilograms, pounds, stones, and ounces — all of them at once.
By opening this website or using its tools, you agree to our Terms and Privacy Policy.
Decimals and fractions both work — 1.5 or 1 1/2.
1 kg = 2.204623 lb
1 kg in every other unit
- Milligram (mg)1,000,000
- Gram (g)1,000
- Tonne (metric ton) (t)
Exactly 1000 kg. Distinct from both the US short ton and the UK long ton below.
0.001 - Grain (gr)15,432.36
- Ounce (oz)35.27396
- Pound (lb)2.204623
- Stone (st)
14 lb. Still the everyday unit for body weight in the UK and Ireland.
0.157473 - Short ton (US) (ton)
2000 lb.
0.001102311 - Long ton (UK) (long ton)
2240 lb — about 12% heavier than the short ton.
0.0009842065 - Troy ounce (ozt)
The unit gold and silver are priced in. About 10% heavier than the ordinary ounce.
32.15075 - Pennyweight (dwt)643.0149
- Carat (metric) (ct)
A gemstone’s mass — exactly 200 mg. Not karat, which is gold purity out of 24.
5,000
Your file never leaves your browser during processing
How it works
To convert a weight, enter the amount above and choose the unit it is in — the answer appears in your chosen unit and in every other unit at the same time, worked out in your browser rather than on a server.
Each unit is defined by its exact size in kilograms and every conversion goes through that base, so the constants are written down once and each pair is derived rather than stored. The pound has been defined as exactly 0.45359237 kilograms since the international agreement of 1959, which makes an ounce exactly 28.349523125 grams — these are definitions, so the conversions carry no rounding error of their own.
Strictly, everything on this page is a mass rather than a weight. Weight is the force gravity exerts on a mass and would change on the Moon; the number on your bathroom scale would not, because the scale is calibrated for Earth. The distinction only matters in physics problems and off-planet, so the page is titled with the word people use — but it is worth knowing which quantity is actually being converted.
Three units on the list are regularly mixed up. The tonne is exactly 1,000 kg; the US short ton is 2,000 lb (907 kg); the UK long ton is 2,240 lb (1,016 kg) — all three are called "a ton" in conversation and they differ by up to 12%. The troy ounce, used for gold and silver, is about 10% heavier than the ordinary avoirdupois ounce, so a "1 oz" gold coin is 31.1 g rather than 28.3 g. And carat is a gemstone mass of exactly 200 mg, which is a different thing entirely from karat, the measure of gold purity out of 24.
The stone is included because it remains the everyday unit for body weight in the UK and Ireland: 14 pounds, so 11 st 4 lb is 158 lb or 71.7 kg.
Kilograms to pounds
One kilogram is 2.2046226 pounds. The rough mental conversion — double it and add 10% — is accurate to about 1%, which is close enough for luggage and wrong enough for a recipe.
| Kilograms | Pounds |
|---|---|
| 1 kg | 2.20462 lb |
| 5 kg | 11.0231 lb |
| 10 kg | 22.0462 lb |
| 20 kg | 44.0925 lb |
| 50 kg | 110.231 lb |
| 60 kg | 132.277 lb |
| 70 kg | 154.324 lb |
| 80 kg | 176.37 lb |
| 90 kg | 198.416 lb |
| 100 kg | 220.462 lb |
Stone to kilograms
A stone is 14 pounds, or 6.35029318 kg. To convert a body weight written as stones and pounds, convert the pounds to a fraction of a stone first — 11 st 4 lb is 11.2857 st.
| Stone | Kilograms |
|---|---|
| 7 st | 44.4521 kg |
| 8 st | 50.8023 kg |
| 9 st | 57.1526 kg |
| 10 st | 63.5029 kg |
| 11 st | 69.8532 kg |
| 12 st | 76.2035 kg |
| 13 st | 82.5538 kg |
| 14 st | 88.9041 kg |
| 15 st | 95.2544 kg |
| 20 st | 127.006 kg |
Grams to ounces
One ounce is 28.349523125 grams exactly. Recipes written in ounces round this to 28 g, which drifts by about 1% — negligible for most cooking and not for baking.
| Grams | Ounces |
|---|---|
| 10 g | 0.35274 oz |
| 25 g | 0.881849 oz |
| 50 g | 1.7637 oz |
| 100 g | 3.5274 oz |
| 200 g | 7.05479 oz |
| 250 g | 8.81849 oz |
| 500 g | 17.637 oz |
| 1,000 g | 35.274 oz |
FAQ
How many pounds are in a kilogram?
2.2046226 pounds. The pound is defined as exactly 0.45359237 kg, so the conversion is exact rather than measured — the decimal simply does not terminate.
How do I convert stones and pounds to kilograms?
Multiply the stones by 6.35029318 and the pounds by 0.45359237, then add. 12 st 6 lb is 76.20 + 2.72 = 78.93 kg.
Is a troy ounce the same as an ounce?
No. A troy ounce is 31.1034768 g against the ordinary ounce’s 28.349523125 g — about 10% heavier. Gold, silver, and platinum are priced per troy ounce, so using the wrong one misprices a holding by a tenth.
What is the difference between a ton and a tonne?
A tonne is exactly 1,000 kg. A US short ton is 907.18 kg and a UK long ton is 1,016.05 kg. All three are on the list above, named apart, because "ton" alone is ambiguous.
Is this converting weight or mass?
Mass. Weight is technically a force and depends on local gravity; mass does not. Every everyday use of "weight" — scales, shipping, recipes, body weight — is really a mass, which is what this converts.