Weight is measured in units such as g, kg, t, oz, lb, st. Pick a source and target unit above, enter a value, and the result appears instantly — free and entirely in your browser. Below you'll find the most common individual conversions as dedicated pages.
Which weight units are there?
- Gram (g) — The gram (g) is one thousandth of a kilogram, the everyday metric unit for food portions, ingredients and small items.
- Kilogram (kg) — The kilogram (kg) is the SI base unit of mass and the standard unit for body weight and groceries in most of the world.
- Tonne (t) — The tonne (t), or metric ton, equals 1,000 kilograms. It is used for vehicles, cargo and bulk materials.
- Ounce (oz) — The ounce (oz) is an imperial mass unit equal to about 28.35 g. It is used for food, mail and ingredients in the US and UK.
- Pound (lb) — The pound (lb) equals 16 ounces or exactly 0.45359237 kg. It is the imperial unit for body weight and groceries in the US and UK.
- Stone (st) — The stone (st) equals 14 pounds or about 6.35 kg. It is used mainly in the UK and Ireland for body weight.
Key facts about weight
The metric world weighs in grams and kilograms; the US and UK also use ounces, pounds and stones. Recipes, body weight and shipping constantly require converting between them.
The pound is defined as exactly 0.45359237 kg (1959), so 1 kg = 2.2046 lb. An ounce is about 28.35 g, and a UK stone is 14 lb (about 6.35 kg).
How to use the weight converter
- Pick the source unit and enter the weight value.
- Pick the target unit — the result appears instantly.
- Use the swap button to reverse the direction.
Everything runs locally in your browser — no uploads, no waiting, no limits, and it even works offline.