Weight Converter
Convert everyday weight and mass units including grams, kilograms, ounces, pounds and stone. Useful for UK conversions like kg to stone, stone to kg, pounds to kg and grams to ounces.
Weight converter calculator
Enter a weight, choose the starting unit and choose the unit you want to convert to. The calculator also shows a UK-friendly stone and pounds equivalent.
Popular weight conversions
Use these quick buttons for common UK metric and imperial weight conversions.
How weight conversion works
Weight conversions use a fixed conversion factor. This calculator converts the original value into grams first, then converts grams into the unit you selected.
converted weight = original weight × conversion factorFor example, one pound is 0.45359237 kilograms, and one stone is exactly 14 pounds.
pounds = kilograms × 2.2046226218
kilograms = pounds ÷ 2.2046226218
stone = pounds ÷ 14Common weight formulas
| Conversion | Formula | Example |
|---|---|---|
| kg to pounds | kg × 2.2046226218 | 10 kg = 22.05 lb |
| pounds to kg | lb ÷ 2.2046226218 | 150 lb = 68.04 kg |
| kg to stone | kg ÷ 6.35029318 | 70 kg = 11.02 st |
| stone to kg | st × 6.35029318 | 12 st = 76.20 kg |
| grams to ounces | g ÷ 28.349523125 | 500 g = 17.64 oz |
| ounces to grams | oz × 28.349523125 | 8 oz = 226.80 g |
UK weight notes
In the UK, both metric and imperial weight units are common in everyday life. Food packaging and most retail weights usually use grams or kilograms, while body weight is often discussed in stone and pounds.
- Food and parcels: grams and kilograms are usually the practical default.
- Body weight: stone and pounds are still common in conversation.
- Older recipes and imported products: ounces and pounds may appear.
- Medical and fitness tools: kilograms are usually easier for calculations.
Rounding converted weights
Converted weights can produce long decimals. Round based on the job: a recipe may need grams, a parcel weight may need one or two decimals, and body weight is often shown as stone plus pounds.
FAQs
How do I convert kg to stone?
Divide kilograms by 6.35029318. For example, 70 kg is about 11.02 stone, or roughly 11 stone 0.3 pounds.
How many pounds are in a stone?
There are 14 pounds in one stone.
How do I convert pounds to kilograms?
Divide pounds by 2.2046226218. For example, 150 lb is about 68.04 kg.
Should I use kg or stone?
Use kilograms for calculations, forms and many health tools. Use stone and pounds when you want a familiar UK body-weight format.