Weight Converter — Free
Runs 100% in your browser — your files never leave your device.
Packages ship in kilograms, produce sells in pounds and ounces, and body weight in much of the British Commonwealth still counts stone. Type any value into one of the seven fields and the rest convert together on the exact international pound.
How it works
- 1
Start from any unit
Kilograms, pounds, stones — the source is your choice.
- 2
Type the number
All six other units recalculate with every keystroke.
- 3
Use the answer
Shipping, cooking, and body-weight figures line up side by side.
About this tool
The pound is defined by the kilogram
Since 1959 one pound avoirdupois equals exactly 0.45359237 kilograms. The ounce is one sixteenth of that, the stone fourteen pounds. Because everything hangs off one exact factor, converting 100 pounds returns the same number on every calculator in the world — this one included.
Weight and mass, briefly
Physics measures mass in kilograms and weight in newtons, but scales, packages, and produce all use "weight" for mass — and so does this converter, because that is the everyday question. The gram, kilogram, and tonne are the same whether gravity agrees or not.
Frequently asked questions
How many pounds is a kilogram?
About 2.2046. For quick estimates, double the kilograms and add a tenth — close enough for luggage and groceries.
Is a stone 14 pounds?
Yes — the UK body-weight stone is exactly 14 pounds, about 6.35 kilograms. It is not used for anything else in daily life.
What is the difference between an ounce and a fluid ounce?
An ounce measures weight; a fluid ounce measures volume. They only match up for water-like liquids, and fluid ounces live on the volume converter.