Weight Converter
Convert kilograms, pounds, ounces, stones and tonnes instantly.
| Milligrammg | 1,000,000 | |
| Gramg | 1,000 | |
| Kilogramkg | 1 | |
| Tonne (metric)t | 0.001 | |
| Ounceoz | 35.274 | |
| Poundlb | 2.2046 | |
| Stonest | 0.1575 | |
| Short ton (US)ton | 0.0011 | |
| Long ton (UK)long ton | 0.001 |
All conversions go through the kilogram using exact internationally agreed factors; only the display is rounded.
About Weight Converter
Recipes, shipping labels, gym equipment and medical records all use different mass units, and getting one wrong can range from an inedible cake to a genuinely serious error.
This converter handles every common metric and imperial mass unit at once with exact factors, including the three different definitions of a ton.
How Weight Converter works in your browser
All units are converted through the kilogram using exact definitions — one pound is exactly 0.45359237 kg and one stone is fourteen pounds. The three meanings of "ton" are kept separate: the metric tonne of 1000 kg, the US short ton of 2000 lb and the UK long ton of 2240 lb.
Every supported unit updates at once from a single input, so you never need to chain conversions and accumulate rounding.
When to use it
- Converting recipe quantities between grams, ounces and pounds.
- Reading body weight given in stones and pounds.
- Checking shipping weights on a label that uses a different system.
Frequently asked questions
How many pounds are in a kilogram?
About 2.20462. One pound is defined as exactly 0.45359237 kg, so 70 kg is roughly 154.3 lb.
How do I convert grams to ounces?
Divide by 28.349523125. One ounce is exactly that many grams, so 100 g is about 3.53 oz.
Is weight the same as mass?
Strictly no - mass is intrinsic while weight is a force - but in everyday use these units all measure mass.
Which ton is used?
All three: the metric tonne of 1000 kg, the US short ton of 2000 lb and the UK long ton of 2240 lb.
What is a stone?
Fourteen pounds, still commonly used for body weight in the UK and Ireland.