A weight converter is a free online tool that instantly converts any measurement of weight or mass between all major metric and imperial units — kilograms, pounds, ounces, grams, stones, milligrams, metric tons, short tons, long tons, and more — with complete accuracy and no manual arithmetic required.
The internationally standardised exact conversion between the avoirdupois pound and the kilogram — fixed in 1959:
1 pound = 0.45359237 kilograms exactly
All other imperial-to-metric weight conversions are derived from this single anchor:
| From | To | Multiply By |
|---|---|---|
| Kilograms (kg) | Pounds (lb) | × 2.20462 |
| Pounds (lb) | Kilograms (kg) | × 0.453592 |
| Kilograms (kg) | Ounces (oz) | × 35.27396 |
| Ounces (oz) | Grams (g) | × 28.34952 |
| Grams (g) | Ounces (oz) | × 0.035274 |
| Stones (st) | Kilograms (kg) | × 6.350293 |
| Kilograms (kg) | Stones (st) | × 0.157473 |
| Stones (st) | Pounds (lb) | × 14 |
| Troy ounces | Grams (g) | × 31.10348 |
| Carats (ct) | Grams (g) | × 0.2 |
| Kilograms | Pounds | Stones & Pounds |
|---|---|---|
| 50 kg | 110.2 lb | 7 st 12.2 lb |
| 60 kg | 132.3 lb | 9 st 6.3 lb |
| 70 kg | 154.3 lb | 11 st 0.3 lb |
| 75 kg | 165.3 lb | 11 st 9.3 lb |
| 80 kg | 176.4 lb | 12 st 8.4 lb |
| 90 kg | 198.4 lb | 14 st 2.4 lb |
| 100 kg | 220.5 lb | 15 st 10.5 lb |
| 120 kg | 264.6 lb | 18 st 12.6 lb |
The stone is a unit of weight used almost exclusively in the United Kingdom and Ireland for expressing human body weight in everyday speech. It is not used in any other country and is not part of either the metric system or the formal US customary system.
Definition: 1 stone = 14 pounds = 6.35029 kilograms
A British person who weighs 76 kilograms would typically say they weigh "12 stone" in everyday conversation — or more precisely "11 stone 13 pounds" (since 76 kg = 167.55 lb = 11 st 13.55 lb).
| Ton Type | Pounds | Kilograms | Compared to Metric Ton |
|---|---|---|---|
| Short ton (US) | 2,000 lb | 907.185 kg | 9.3% lighter |
| Metric ton (tonne) | 2,204.623 lb | 1,000.000 kg | Baseline |
| Long ton (UK) | 2,240 lb | 1,016.047 kg | 1.6% heavier |
Used for all everyday commercial weight — food, body weight, freight. 16 ounces = 1 pound, 14 pounds = 1 stone, 2,000 pounds = 1 short ton.
Used exclusively for precious metals (gold, silver, platinum). 1 troy ounce = 31.1035 grams (heavier than the avoirdupois ounce of 28.3495 grams). 1 troy pound = 373.242 grams (lighter than the avoirdupois pound of 453.592 grams — because a troy pound contains only 12 troy ounces while an avoirdupois pound contains 16 smaller ounces).
| Grams | Ounces | Common Equivalent |
|---|---|---|
| 28g | 1 oz | Standard serving reference |
| 100g | 3.527 oz | Common nutrition label size |
| 113g | 4 oz (¼ lb) | Quarter pound burger |
| 227g | 8 oz (½ lb) | Half pound |
| 250g | 8.818 oz | Common recipe measurement |
| 454g | 16 oz (1 lb) | One pound |
| 500g | 17.637 oz | Half kilogram |
| 1000g | 35.274 oz (2.205 lb) | One kilogram |
Yes. This online weight converter is 100% free with no registration, no subscription, and no payment required. Convert as many measurements as you need, as often as you need them.
One kilogram equals exactly 2.20462 pounds. Equivalently, one pound equals exactly 0.45359237 kilograms — the internationally standardised exact conversion factor fixed in 1959. For quick mental estimation: 1 kg ≈ 2.2 lb and 1 lb ≈ 0.45 kg.
One avoirdupois ounce equals exactly 28.349523125 grams. One troy ounce — used for precious metals — equals 31.1034768 grams. When a recipe calls for ounces, it always means avoirdupois ounces (28.35g). When gold or silver prices quote "per ounce," they always mean troy ounces (31.10g).
One stone equals exactly 14 pounds or 6.35029318 kilograms. To convert stones to kilograms, multiply the number of stones by 6.35029. The stone is used almost exclusively in the United Kingdom and Ireland for expressing human body weight in everyday speech.
A short ton (the American ton) equals 2,000 pounds or 907.185 kilograms. A metric ton (tonne) equals exactly 1,000 kilograms or 2,204.623 pounds. A metric ton is approximately 10% heavier than a short ton. A long ton (the British ton) equals 2,240 pounds or 1,016.047 kilograms.
The most useful mental math shortcut: divide pounds by 2.2 to get kilograms. For example, 154 pounds ÷ 2.2 = 70 kg. For the reverse, multiply kilograms by 2.2: 70 kg × 2.2 = 154 pounds. This gives a result accurate to within about 0.09%.
A troy ounce (31.1035g) is the unit used for trading precious metals — gold, silver, platinum, palladium. It is approximately 10% heavier than the avoirdupois ounce (28.3495g) used for everyday weights. When you see the price of gold quoted per ounce, it is always per troy ounce.
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