Weight Converter

Use this free weight converter to change a weight between micrograms, milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and US and UK tons. Type a number in either box and the other one follows as you type, with the same weight in the main units shown underneath. You can type stone and pounds (11 st 4 lb) or pounds and ounces (5 lb 8 oz), and get a weight such as 12 st 8.37 lb. Pick how many decimals to round to, swap the two units with one click, and copy a link to your conversion. Charts list the most searched values for kg to lbs, lbs to kg, grams to ounces, ounces to pounds and stone, plus body weights in stone and pounds and the answers to how many ounces are in a pound. It is free and instant, and your numbers stay in your browser.

How to convert kg to pounds

Divide the kilograms by 0.45359237, which is the same as multiplying by 2.2046226. A pound is defined as exactly 0.45359237 kg, so the answer is exact.

For 5 kg: 5 × 2.2046226 = 11.0231 lb. For 80 kg: 176.3698 lb. A quick estimate is to double the kilograms and add a tenth of the result.

How to convert pounds to kg

Multiply the pounds by 0.45359237: kg = pounds × 0.45359237. For 150 lb: 150 × 0.45359237 = 68.0389 kg. For 1 lb it is 0.4536 kg, or 453.59237 grams.

Stone and pounds (body weight)

A stone is 14 pounds, which is 6.35029318 kg. It is used for body weight in the UK and Ireland. To change kilograms to stone and pounds, turn them into pounds first, then divide by 14: the whole part is the stone and the rest is the pounds. For 80 kg: 176.37 lb ÷ 14 = 12 stone with 8.37 lb left, so 80 kg is 12 st 8.37 lb. Going back, 10 stone is 10 × 6.35029318 = 63.5029 kg. You can type a weight as 11 st 4 lb, and choose "Stone and pounds" in either list to see the answer that way.

Ounces and grams

An ounce is one sixteenth of a pound, which is 28.349523125 grams. To change ounces to grams, multiply by 28.3495: 8 oz is 226.796 g. To change grams to ounces, divide by 28.3495: 100 g is 3.5274 oz, and 500 g is 17.637 oz.

How many ounces are in a pound?

There are 16 ounces in a pound, and 14 pounds in a stone. The "How Many in a …?" table above lists these and more, such as how many grams are in a pound (453.59237).

Tons and tonnes

Three different units are called a ton. The US (short) ton is 2,000 pounds, which is 907.18474 kg. The UK (long) ton is 2,240 pounds, or 1,016.0469 kg. The metric tonne is 1,000 kg, or 2,204.62 pounds. Check which one is meant before you convert.

Micrograms, milligrams and grams

There are 1,000 micrograms (µg or mcg) in a milligram, 1,000 milligrams in a gram and 1,000 grams in a kilogram. This converter is for everyday sums. Do not use it to work out a medicine dose: ask a doctor or a pharmacist.

Weight and mass

Strictly, mass is how much matter an object has, measured in kilograms, and weight is the force of gravity pulling on it. In everyday life, and on a kitchen or bathroom scale, people use "weight" for mass, and that is what this converter changes between units.

Why a pound is exactly 0.45359237 kg

Since the international agreement of 1959, the pound has been defined as exactly 0.45359237 kg. Because of that, every conversion between pounds, ounces, stone and the metric units is exact, and the converter shows as many digits as you ask for.