Weight & Mass Converter
Convert between weight and mass units — kilograms, pounds, ounces, grams, tons, stones, carats, and more.
About this calculator
Convert any weight or mass into eleven units at once: kilograms, grams, milligrams, pounds, ounces, metric tons, stones, carats, US short tons, UK long tons and micrograms. Type a value, choose its unit and the grid fills in.
Carats and long tons are rarely offered by simple converters, and they matter for jewellery, shipping and older documents. One carat is 0.2 g and a UK long ton is 1,016.05 kg.
How to use it
- Enter the Value.
- Choose the unit in From.
- Read the grid. Tiny and huge results use scientific notation.
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.