Weight & Mass Converter
Mass measures the amount of matter in an object. In daily life it is often called weight. The SI base unit is the kilogram. Common conversions move between metric units (grams, kilograms, tonnes) and US/Imperial units (ounces, pounds, stones, tons).
About weight & mass conversion
Weight & Mass conversion is commonly needed when tracking body weight, shipping parcels, cooking, and dosing in fitness or nutrition. In everyday language 'weight' usually means mass; true weight is a force and is handled in the Force category.
Popular conversions
All weight & mass units
| Unit | Symbol | System |
|---|---|---|
| Kilogram | kg | SI |
| Gram | g | SI |
| Milligram | mg | SI |
| Microgram | µg | SI |
| Metric Ton | t | Metric |
| Pound | lb | Imperial |
| Ounce | oz | Imperial |
| Stone | st | Imperial |
| US Short Ton | ton (US) | US |
| UK Long Ton | ton (UK) | Imperial |
| Carat | ct | Metric |
Frequently asked questions
What is the base unit for weight & mass?
Weight & Mass conversions on this site are calculated against the kilogram (kg).
Which weight & mass units can I convert?
You can convert between 11 units, including kilogram, gram, milligram, microgram, and more.
Where is weight & mass conversion useful?
It is commonly needed when tracking body weight, shipping parcels, cooking, and dosing in fitness or nutrition.
Does this converter mix measurement systems?
The converter supports SI, Metric, Imperial, US units and keeps their exact definitions separate so results stay accurate.