⚖️ Weight & Mass Converter
Convert between kilograms, grams, pounds, ounces, stones and tons. All factors follow the international pound definition (1 lb = 0.45359237 kg exactly, since 1959).
1 mg = 0.001 g
1 milligrams = 0.001 grams
1 × 0.001 = 0.001
1 mg equals 0.001 g, so multiplying by 0.001 converts the value. The result describes the exact same quantity, only the measuring stick changes.
Popular weight & mass conversions
- Kilograms to Pounds (kg → lb)
- Pounds to Kilograms (lb → kg)
- Grams to Ounces (g → oz)
- Ounces to Grams (oz → g)
- Kilograms to Stones (kg → st)
- Stones to Kilograms (st → kg)
- Pounds to Stones (lb → st)
- Stones to Pounds (st → lb)
- Ounces to Pounds (oz → lb)
- Pounds to Ounces (lb → oz)
- Grams to Kilograms (g → kg)
- Kilograms to Grams (kg → g)
- Grams to Pounds (g → lb)
- Pounds to Grams (lb → g)
From the blog
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Cups to mL and Grams: The Baking Conversion Guide That Actually Works
1 US cup = 236.59 mL, but an Australian cup is 250 mL and a Japanese cup 200 mL. The cup-systems table, cups-to-grams for baking, and why weighing wins.
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Kg to Lbs Conversion: Formula, Charts and the 2-Second Mental Trick
1 kg = 2.2046 lbs exactly. The full kg to lbs guide: formula, mental trick, charts for body weight, luggage, gym plates and newborns.
All weight & mass units
| Unit | Symbol | Definition |
|---|---|---|
| Milligram | mg | A milligram (mg) is one thousandth of a gram. It is the standard unit for medication dosages and nutritional micronutrients. |
| Gram | g | A gram (g) is one thousandth of a kilogram. It is the everyday metric unit for cooking ingredients, nutrition labels and postal weights. |
| Kilogram | kg | The kilogram (kg) is the SI base unit of mass, defined since 2019 by fixing the Planck constant. It is the standard unit for body weight and goods in most of the world. |
| Metric ton | t | A metric ton or tonne (t) is 1,000 kilograms (about 2,204.6 pounds). It is used for vehicles, freight and industrial quantities. |
| Ounce | oz | An ounce (oz) is 1/16 of a pound, exactly 28.349523125 grams. It is common for food portions, postal weights and body weight changes in the US. |
| Pound | lb | A pound (lb) is defined as exactly 0.45359237 kilograms. It is the standard body-weight and grocery unit in the United States. |
| Stone | st | A stone (st) equals 14 pounds or exactly 6.35029318 kilograms. Body weight in the United Kingdom and Ireland is customarily given in stones and pounds. |
| US ton | ton (US) | A US ton (short ton) is 2,000 pounds, exactly 907.18474 kilograms. It is the customary ton used in the United States. |
| Carat | ct | A carat (ct) is exactly 200 milligrams. It is the standard unit for gemstone and diamond weights worldwide. |
Frequently asked questions
How do I convert weight & mass units?
Choose your two units in the converter above and type a value, the result updates instantly, entirely in your browser. All 9 weight & mass units on this page are interchangeable, so you can convert in either direction.
Which weight & mass units can I convert here?
This converter supports 9 weight & mass units: Milligram (mg), Gram (g), Kilogram (kg), Metric ton (t) and 5 more. Pick any two to convert between them.
What is the most common weight & mass conversion?
One of the most-used weight & mass conversions is Kilograms to Pounds (kg → lb). Every weight & mass pair we support is linked below, each with its own formula and table.
Is this Weight & Mass Converter free and private?
Yes. It is free with no sign-up, uses the exact internationally defined conversion factors, and computes every result locally in your browser, nothing you type is uploaded, and the page keeps working offline.