Weight & Mass Converter
Convert between kilograms, pounds, grams, ounces, tonnes and other units of weight and mass.
Convert weight & mass
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Popular weight & mass conversions
Weight & Mass units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the kilogram (kg).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Microgram | µg | SI | = 1e-9 kg |
| Milligram | mg | SI | = 0.000001 kg |
| Gram | g | SI | = 0.001 kg |
| Kilogram | kg | SI | Base unit |
| Tonne (metric ton) | t | SI-accepted | = 1000 kg |
| Carat (metric) | ct | metric | = 0.0002 kg |
| Grain | gr | US customary | = 0.00006479891 kg |
| Ounce | oz | US customary | = 0.028349523125 kg |
| Pound | lb | US customary | = 0.45359237 kg |
| Short ton (US ton) | short tn | US customary | = 907.18474 kg |
| Long ton (UK ton) | long tn | imperial | = 1016.0469088 kg |
Kilogram quick reference
| Kilogram | Milligram | Gram | Tonne (metric ton) |
|---|---|---|---|
| 1 kg | = 1000000 mg | = 1000 g | = 0.001 t |
| 10 kg | = 10000000 mg | = 10000 g | = 0.01 t |
| 100 kg | = 100000000 mg | = 100000 g | = 0.1 t |
| 1000 kg | = 1000000000 mg | = 1000000 g | = 1 t |
Among the 11 weight & mass units on this page, the smallest is the microgram (µg) and the largest is the long ton (uk ton) (long tn).
More weight & mass conversions
- Pound to Ouncelb → oz
- Ounce to Poundoz → lb
- Kilogram to Ouncekg → oz
- Ounce to Kilogramoz → kg
- Tonne (metric ton) to Poundt → lb
- Tonne (metric ton) to Short ton (US ton)t → short tn
- Carat (metric) to Gramct → g
- Pound to Tonne (metric ton)lb → t
- Short ton (US ton) to Tonne (metric ton)short tn → t
- Gram to Carat (metric)g → ct
- Milligram to Grainmg → gr
- Grain to Milligramgr → mg
About weight & mass units
Mass is the amount of matter in an object. The kilogram is the SI base unit and, since 2019, it is defined through the Planck constant.
In everyday language "weight" usually means mass, and that is what this converter handles. The international pound is defined as exactly 0.45359237 kg, so kilogram to pound conversions are exact.
Frequently asked questions
- What is the difference between weight and mass?
- Mass is how much matter an object contains and does not change with location. Weight, in physics, is the force of gravity on that mass and is measured in force units such as newtons. For weight as a force, use the force converter.
- Which ounce does this converter use?
- The avoirdupois ounce, exactly 28.349523125 g, used for food and everyday goods. Precious metals use the troy ounce, which is a different unit.
- What is the difference between a tonne, a short ton and a long ton?
- A tonne (metric ton) is 1000 kg. A short ton (US) is 2000 lb, about 907 kg. A long ton (UK) is 2240 lb, about 1016 kg.
- How many milligrams are in one kilogram?
- One kilogram = 1000000 mg (milligrams).
- How many grams are in one kilogram?
- One kilogram = 1000 g (grams).
- How many tonnes are in one kilogram?
- One kilogram = 0.001 t (tonnes).