Weight Conversions
Convert mass or weight measurements between all major metric (kg, g), imperial (lb, oz), and compound units (stones and pounds).
The Distinction Between Mass and Weight Conversion
While often used interchangeably in daily life, technically, this is a **Mass Converter**. **Mass** is the amount of matter in an object, which remains constant. **Weight** is the force of gravity on that mass. Since all common weight/mass units are standardized on Earth's gravity, the conversion factors are consistent.
The Base Unit: The Kilogram
The **Kilogram (kg)** is the SI base unit for mass. All conversion factors are derived from the official relationship between the kilogram and the imperial pound: $$ 1 \text{ pound (lb)} = 0.45359237 \text{ kilograms (kg) (exactly)} $$ From this constant, all other conversions are derived, including the Imperial/US ounce, stone, and ton.
Compound Unit Conversion (Stones and Pounds):
Body weight is often measured in **stones and pounds** in the UK and Ireland ($1 \text{ stone} = 14 \text{ pounds}$). This tool correctly handles conversion from a total weight (like KG) into the nearest whole stone and remaining pounds for precision.