Weight Converter

Convert weight and mass between metric and imperial units, milligrams, grams, kilograms, metric tons, ounces, pounds, and stones. Calculates in your browser.

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About weight conversions

Enter a value and choose the units to convert between. Each weight unit is defined against a single base unit, so any pair lines up consistently, the table shows your value in every weight unit at once.

What this does

A weight converter changes a mass from one unit to another, metric units like milligrams, grams, kilograms, and metric tons, and imperial units like ounces, pounds, and stones.

How to use it

  1. Enter a value and pick its unit.
  2. Choose the unit to convert to.
  3. Read the converted result instantly.
  4. Swap the units to reverse the conversion.

How it works

Each value is converted to kilograms first and then to the target unit. The pound is defined as exactly 0.45359237 kg, so kilogram–pound conversions are exact. These are mass units, used the way kitchen and shipping scales work.

lb = kg ÷ 0.45359237

Example

1 kilogram is about 2.205 pounds, and 100 grams is about 3.527 ounces. One stone is 14 pounds.

Sources & methodology

Last updated .

Frequently asked questions

How many pounds are in a kilogram?

About 2.2046 pounds. One pound is defined as exactly 0.45359237 kilograms.

Does this measure weight or mass?

These are mass units. In everyday use the two terms are used interchangeably, which is how most kitchen and shipping scales work.

Is my data stored?

No. Everything is calculated locally in your browser.