Mass Converter
The kilogram (kg) is the base mass unit here, so every one of the 7 units below, including milligrams and grams, converts through it. Enter a value, pick your units, and the result updates instantly, all in your browser.
All mass units
| Unit | Symbol | 1 unit in kilograms |
|---|---|---|
| Milligram | mg | 0.000001 |
| Gram | g | 0.001 |
| Kilogram | kg | 1 |
| Metric ton | t | 1000 |
| Ounce | oz | 0.02835 |
| Pound | lb | 0.453592 |
| Stone | st | 6.3503 |
Popular mass converters
The most-searched mass conversions, each with a full decimal table, the derivation of the factor and its sources.
All mass conversions
Mass converters move between metric units like kilograms and grams and imperial units like pounds, ounces and stone. Everything is referenced to the kilogram, the SI base unit of mass.
Frequently asked questions
How many pounds are in a kilogram?
One kilogram equals about 2.20462 pounds. The pound is defined as exactly 0.45359237 kilograms, so the conversion is exact rather than approximate.
What is a stone in kilograms?
One stone equals 14 pounds, which is about 6.35029 kilograms. Stone is still commonly used for body weight in the UK and Ireland.
Is mass the same as weight?
In everyday use the words are interchangeable, and these converters treat them that way. Strictly, mass is the amount of matter and weight is the force gravity exerts on it, but on Earth the numbers line up.