Weight Converter
Enter a weight, choose its unit and see it in nine units at once: milligrams, grams, kilograms, metric tonnes, ounces, pounds, stone, US short tons and UK long tons. Every factor is exact, and the three kinds of ton are labeled, because they are not the same size.
Last updated November 4, 2026
Result
1 kilogram = 2.2046226 pounds = 1,000 grams
| Unit | Weight |
|---|---|
| milligrams | 1,000,000 milligrams |
| grams | 1,000 grams |
| kilograms | 1 kilogram |
| metric tonnes | 0.001 metric tonnes |
| ounces | 35.273962 ounces |
Exact definitions: 1 lb = 0.45359237 kg, 1 oz = 1/16 lb, 1 stone = 14 lb. These are units of mass, shown as everyday weight on Earth, not force. Rounded to 8 significant digits.
Show the work
Formula: kilograms = weight x kilograms per unit; target = kilograms / kilograms per target unit
- Entered: 1 kilogram.
- Kilograms first: 1 kg = 1 kg, so 1 x 1 = 1 kg.
- milligrams: 1 kg / 0.000001 (1 mg = 0.000001 kg) = 1,000,000 milligrams.
- grams: 1 kg / 0.001 (1 g = 0.001 kg) = 1,000 grams.
- metric tonnes: 1 kg / 1,000 (1 t = 1,000 kg) = 0.001 metric tonnes.
- ounces: 1 kg / 0.028349523125 (1 oz = 0.028349523125 kg) = 35.273962 ounces.
- pounds: 1 kg / 0.45359237 (1 lb = 0.45359237 kg) = 2.2046226 pounds.
- stone: 1 kg / 6.35029318 (1 st = 6.35029318 kg) = 0.15747304 stone.
- US short tons: 1 kg / 907.18474 (1 US ton = 907.18474 kg) = 0.0011023113 US short tons.
- UK long tons: 1 kg / 1,016.0469088 (1 UK ton = 1,016.0469088 kg) = 0.00098420653 UK long tons.
Result: 1 kilogram = 2.2046226 pounds = 1,000 grams
How weight units convert
1 lb = 0.45359237 kg · 1 oz = 1/16 lb · 1 st = 14 lb · 1 US ton = 2,000 lb · 1 UK ton = 2,240 lb
This converter holds every weight as kilograms. It multiplies your number by the kilograms in your unit, then divides by the kilograms in the unit you want, so any pair of the nine units takes two steps. The metric units are exact powers of ten: 1 kg is 1,000 g and 1 g is 1,000 mg, and a metric tonne is 1,000 kg.
The pound is defined by the 1959 international yard and pound agreement as exactly 0.45359237 kilograms. Everything else in the avoirdupois system comes from the pound: an ounce is one sixteenth of a pound, a stone is 14 pounds, a US short ton is 2,000 pounds and a UK long ton is 2,240 pounds. Because the pound is exact, none of these conversions carries a rounding error until the result is displayed.
See how we calculate for the formulas, sources and review schedule behind every calculator.
Also useful alongside this calculator: Volume Converter and Metric Conversion.
Mass versus weight
Strictly, the kilogram and the pound are units of mass, which is the amount of matter in an object. Weight, in physics, is a force: the pull of gravity on that mass, measured in newtons. A person with a mass of 70 kg has the same mass on the Moon, but weighs about one sixth as much there.
In everyday life, and on every bathroom scale and parcel label, weight means mass measured on Earth, and people quote it in kilograms or pounds. This converter works in that everyday sense. It converts mass units, not forces, so it assumes standard Earth gravity and does not convert to newtons.
Metric, US and UK tons
Three different units are called a ton. The metric tonne is 1,000 kg, which is about 2,204.62 lb. The US short ton is 2,000 lb, or about 907.18 kg. The UK long ton is 2,240 lb, or about 1,016.05 kg. They differ by up to 12%, so check which one a cargo, vehicle or quarry figure uses before converting.
The converter labels them as metric tonnes, US short tons and UK long tons, and the symbols t, US ton and UK ton, so the result is never ambiguous.
Pounds, ounces and stone
Body weight in the United Kingdom and Ireland is often given in stone and pounds. One stone is 14 pounds, so 11 stone is 154 lb, or about 69.85 kg. This converter shows stone as a decimal number, so 154 lb is 11 stone.
Ounces in this tool are avoirdupois ounces, 28.349523125 g each. They are not troy ounces, which are used for gold and silver, and not fluid ounces, which measure volume.
Milligrams and grams
Milligrams matter for medicines, supplements and lab work, and grams for food and postage. A 250 mg tablet is 0.25 g, and a 500 g bag of flour is about 1.1023 lb. Always follow a prescription or label for dosing, and use this tool only to change units.
Precision and rounding
The factors are exact by definition, so the only rounding comes from showing the result. The converter shows up to 8 significant digits, which keeps one milligram in tonnes readable. Round your final answer, not the steps in between.
How to use the Weight Converter
- Enter the weight as a number of 0 or more.
- Choose its unit, and pick the right ton if you are working with tons.
- Read the weight in all nine units, then use Copy, Print or Share.
Worked example
To convert 1 pound, multiply by 0.45359237 to get 0.45359237 kilograms, which is 453.59237 grams. Dividing by the 0.028349523125 kilograms in an ounce gives exactly 16 ounces, and dividing by 6.35029318 kilograms in a stone gives 1/14 of a stone, about 0.0714 st. The table shows five common weights in five units.
| Weight | kg | g | lb | oz | st |
|---|---|---|---|---|---|
| 1 kilogram | 1 | 1,000 | 2.2046 | 35.274 | 0.1575 |
| 1 pound | 0.4536 | 453.59 | 1 | 16 | 0.0714 |
| 1 stone | 6.3503 | 6,350.3 | 14 | 224 | 1 |
| 1 ounce | 0.0283 | 28.35 | 0.0625 | 1 | 0.0045 |
| 250 grams | 0.25 | 250 | 0.5512 | 8.8185 | 0.0394 |
Frequently asked questions
How many pounds are in a kilogram?
One kilogram is about 2.2046226 pounds. Going the other way, one pound is exactly 0.45359237 kilograms.
What is the difference between mass and weight?
Mass is the amount of matter in an object, while weight is the force of gravity on it. This tool converts the everyday mass units on Earth.
How many pounds are in a ton?
A US short ton is 2,000 pounds, a UK long ton is 2,240 pounds, and a metric tonne is about 2,204.62 pounds.
How many pounds are in a stone?
One stone is exactly 14 pounds, which is about 6.35 kilograms. It is mainly used for body weight in the UK and Ireland.
Can I convert a negative weight?
No. A weight is 0 or more, so the converter shows an error for negative values instead of a result.