Weight & Mass Converter
Convert between kilograms, pounds, ounces, stones, tonnes and grams.
What the Weight & Mass Converter does
Mass conversion uses fixed ratios. One pound is defined as exactly 0.45359237 kg. Note that a US short ton (2,000 lb) differs from a UK long ton (2,240 lb) and from a metric tonne (1,000 kg).
Formula
Convert to kilogram, then divide by the target unit's factorResult = Value × (from factor ÷ to factor)
Inputs explained
| Input | Unit | Required | Notes |
|---|---|---|---|
| Value | number | Yes | — |
| From | one of 10 options | Yes | — |
| To | one of 10 options | Yes | — |
How to use it
- Choose From and To.
- Enter Value.
- Select Calculate.
Worked example
Convert 70 kilograms to pounds.
- Value
- 70
- From
- Kilogram
- To
- Pound
70 ÷ 0.45359237 = 154.324 lb.
Frequently asked questions
What is the difference between mass and weight?
Mass is the amount of matter; weight is the force gravity exerts on it. In everyday use on Earth the two are used interchangeably.
How many pounds in a stone?
14 pounds. Stones are still commonly used for body weight in the UK and Ireland.