Weight & Mass Converter
Convert between kilograms, pounds, ounces, grams, tons, stones and more weight units.
About this calculator
Choose a unit to convert from, a unit to convert to and type a value. The Weight Converter returns the result and a full table of the same weight in milligrams, grams, kilograms, tonnes, ounces, pounds, stones and tons.
The ⇄ button swaps the two units so you can check the answer in reverse. Conversions use the exact definitions, including 0.45359237 kg per pound.
How to use it
- Type the Value.
- Choose the From and To units.
- Read the result field and the table under it.
Method
Everything goes through kilograms. 1 pound = 0.45359237 kg exactly, 1 ounce = 28.349523 g, 1 stone = 6.35029318 kg (14 pounds), 1 tonne = 1,000 kg and 1 carat = 0.2 g. Indian trade also uses the quintal (100 kg) and the tola (about 11.66 g, used for gold).
Worked example
Common conversions
| 70 kg | 154.32 lb |
| 150 lb | 68.04 kg |
| 100 g | 3.5274 oz |
| 1 oz | 28.3495 g |
| 1 stone | 6.35029 kg |
Tips and common mistakes
- 1 kg is 2.2046 lb. For a quick estimate, double and add 10%.
- Ounces for weight (avoirdupois) differ from fluid ounces for volume.
- Gold and silver use troy ounces (31.1035 g), not the 28.35 g ounce.
- Stone is used in the UK for body weight: 1 stone is 14 pounds.
- For cooking, weigh in grams where you can. It is more consistent than cups.
Frequently asked questions
How many pounds are in a kilogram?
2.2046226 pounds.
How many grams are in an ounce?
28.3495 grams.
How many kilograms is 150 pounds?
About 68.04 kg.
What is a tonne?
1,000 kilograms, also called a metric ton. A US short ton is 907.185 kg.
How many pounds are in a stone?
14.
Is mass the same as weight?
Strictly no, but in everyday use the units are interchangeable on Earth.