How to convert weight and mass
The pound is defined as exactly 0.45359237 kg, so 1 kg ≈ 2.20462 lb. An ounce is 1/16 of a pound (28.3495 g), and a stone is 14 pounds (6.35 kg), which is often used for body weight in the UK. The converter changes your value to kilograms and then to the unit you want, using exact factors.
- Kilograms to pounds: multiply by 2.20462 (70 kg = 154.32 lb).
- Pounds to kilograms: multiply by 0.453592 (150 lb = 68.04 kg).
- Grams to ounces: divide by 28.3495 (100 g = 3.53 oz).
Gold and gems: precious metals use the troy ounce (31.1035 g), not the ordinary ounce. A carat is 200 mg. In India gold is also quoted per tola: 11.6638 g, about 11.66 g. Jewellers often round it to 10 g, so check which one a price uses.
Common weight conversion factors
| Unit | Equals | Reverse |
|---|---|---|
| 1 kilogram | 2.204622622 lb | 1 pound = 0.45359237 kg |
| 1 gram | 0.035273962 oz | 1 ounce = 28.34952313 g |
| 1 stone | 6.35029318 kg | 1 kilogram = 0.1574730444 st |
| 1 tonne (metric ton) | 2,204.622622 lb | 1 pound = 0.0004535924 t |
| 1 tola | 11.6638038 g | 1 gram = 0.0857353242 tola |
| 1 troy ounce | 31.1034768 g | 1 gram = 0.0321507466 oz t |
| 1 carat | 0.2 g | 1 gram = 5 ct |
| 1 milligram | 0.001 g | 1 gram = 1,000 mg |
| 1 quintal | 100 kg | 1 kilogram = 0.01 q |
Weight conversions
Each of these has its own page with the formula, worked examples and a full conversion table:
All weight units on this converter
| Unit | Symbol | 1 unit equals | System |
|---|---|---|---|
| Microgram | µg | 1 × 10⁻⁹ kg | Metric |
| Milligram | mg | 0.000001 kg | Metric |
| Gram | g | 0.001 kg | Metric |
| Kilogram | kg | 1 kg | Metric |
| Quintal | q | 100 kg | Metric |
| Tonne (metric ton) | t | 1,000 kg | Metric |
| Grain | gr | 0.0000647989 kg | Imperial / US |
| Ounce | oz | 0.0283495231 kg | Imperial / US |
| Pound | lb | 0.45359237 kg | Imperial / US |
| Stone | st | 6.35029318 kg | Imperial / US |
| Short ton (US) | US ton | 907.18474 kg | Imperial / US |
| Long ton (UK) | UK ton | 1,016.046909 kg | Imperial / US |
| Troy ounce | oz t | 0.0311034768 kg | Precious metals & gems |
| Pennyweight | dwt | 0.0015551738 kg | Precious metals & gems |
| Carat | ct | 0.0002 kg | Precious metals & gems |
| Tola | tola | 0.0116638038 kg | Indian |
Frequently asked questions
How many pounds are in a kilogram?
1 kilogram = 2.20462262 pounds. To convert kg to lbs, multiply by 2.20462.
What is the difference between weight and mass?
Mass is the amount of matter (measured in kilograms); weight is the force of gravity on it. In everyday use, and on this converter, “weight” means mass.
How many grams is one tola?
One tola is 11.6638038 grams (180 grains). In everyday gold trading it is often rounded to 10 grams, so always check which one a price refers to.
What is a quintal?
A quintal is 100 kilograms. It is widely used in India for crop yields and grain prices.