Instantly convert between kilograms, grams, milligrams, metric tons, pounds, ounces, stone, US & UK tons, carats and grains. Get live results, a full conversion table, batch conversion for multiple values, and the exact formulas used.
This calculator converts weight and mass instantly between kilograms, grams, milligrams, metric tons, pounds, ounces, stone, US tons (short), UK tons (long), carats and grains, using internationally accepted conversion constants. Results update live as you type, and the table below shows the same value converted into every supported unit at once.
Your entered value converted into every supported weight unit. Click a row to set it as your target unit.
| Unit | Symbol | Converted Value |
|---|
Convert a whole list of weights at once. Enter one value per line — useful for shipping manifests, recipe scaling, or lab data sheets.
Result = (Value × From-Unit Factor) ÷ To-Unit Factor
Every weight unit is converted through a common base unit, the kilogram (the SI base unit for mass). Each unit has a fixed factor representing how many kilograms it equals. To convert between any two units, the calculator first converts your value into kilograms, then converts that result into the target unit.
Example: kg → lb
10 kg × 2.204623 = 22.0462 lb
Example: oz → g
5 oz × 28.349523 = 141.7476 g
Common weight conversions people search for most often:
| Conversion | Result |
|---|---|
| 1 Kilogram | 2.20462 Pounds |
| 1 Pound | 0.453592 Kilograms |
| 1 Gram | 0.035274 Ounces |
| 1 Ounce | 28.3495 Grams |
| 1 Stone | 6.35029 Kilograms / 14 Pounds |
| 1 Kilogram | 0.157473 Stone |
| 1 Metric Ton | 1,000 Kilograms |
| 1 US Ton (short) | 907.185 Kilograms |
| 1 UK Ton (long) | 1,016.05 Kilograms |
| 1 Carat | 0.2 Grams |
| 1 Grain | 0.0648 Grams |
| Unit | Symbol | System | Common Use | Equals (kg) |
|---|
In everyday language, "weight" and "mass" are used interchangeably, and that's exactly how this calculator treats them — converting kilograms, pounds, grams and similar units as measures of how much matter an object contains.
In physics, however, the two are distinct. Mass is the amount of matter in an object and stays constant everywhere in the universe. Weight is the force gravity exerts on that mass, measured in Newtons, and it changes depending on gravitational pull — an object weighs less on the Moon than on Earth even though its mass is unchanged.
Units like the kilogram and pound are technically units of mass, but they are colloquially called "weight" in trade, cooking, medicine, and fitness — which is the convention this converter follows.
Most of the world uses the metric system (kilograms, grams) for weight, while the United States primarily uses the imperial/US customary system (pounds, ounces). The United Kingdom uses a mix of both, with stone still common for body weight.
Type the weight you want to convert into the value field.
Select the unit you're converting from and the unit you want to convert to.
The converted value updates instantly as you type or change units.
View your value converted into all 11 supported weight units at once, or convert a whole list with the batch tool.
From kilograms to pounds and carats to grains, get accurate conversions in seconds — plus batch conversion for entire lists. Explore our full library of free conversion calculators.