Weight & Mass Converter
Convert between kilograms, pounds, grams, ounces, tonnes, and more weight units instantly.
About this calculator
Weight & Mass Converter lists a value in kilograms, grams, milligrams, tonnes, pounds, ounces, stones and micrograms at once. Enter the number, pick its unit, and read across.
It is the quickest way to move between metric and imperial for body weight, luggage limits, recipes and shipping. The factors use the exact definition of the pound, so 1 lb is 0.45359237 kg, not a rounded 0.4536.
How to use it
- Type the Value.
- Choose the From Unit.
- Read the other units in the list.
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
1 kilogram in other units
| Grams | 1,000 |
| Milligrams | 1,000,000 |
| Pounds | 2.204623 |
| Ounces | 35.27396 |
| Stones | 0.157473 |
| Tonnes | 0.001 |
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.