Calculators & Converters
Weight Converter
The Weight Converter changes a mass value from one unit into another, covering everyday units like kilograms, grams, pounds, ounces and stone as well as larger units such as metric and US tonnes. It's handy for cooking and baking, tracking fitness or body weight goals, shipping and postage calculations, or converting product specs listed in an unfamiliar unit.
All the maths happens directly in your browser, so figures update the instant you type or change a unit, without any data being uploaded or a server call in between. You can trust the tool to work quickly and to keep whatever numbers you enter on your own device.
How to Use the Weight Converter
- Open the Weight Converter tool.
- Enter the weight or mass value you have.
- Select the starting unit and the unit you want to convert it to.
- View the converted figure, which recalculates instantly as you make changes.
Frequently Asked Questions
What units does the Weight Converter support?
It covers common metric units such as milligrams, grams, kilograms and tonnes, plus imperial and US customary units like ounces, pounds and stone.
Is the conversion precise enough for cooking or shipping?
The tool uses standard defined conversion factors and calculates to several decimal places, which is generally precise enough for kitchen recipes or estimating shipping weight, though official shipments should confirm figures with your carrier's own scale.
Does it round the results?
Results are shown with sensible decimal precision for readability, but the underlying calculation is not rounded until it's displayed, so you can adjust inputs for finer detail if needed.