Unit Converter: how to use it (and the conversions behind it)
A short guide to converting between metric and imperial units — how the tool works, the most common conversions, and why it runs entirely in your browser.
Open the Unit Converter →What this tool does
The Unit Converter handles four everyday categories — length, weight, temperature, and volume — and converts instantly between the units in each. It's built on standard conversion factors, so the answers match official definitions.
How to use it
- Open the Unit Converter.
- Pick a category (Length, Weight, Temperature, or Volume).
- Choose the From and To units and type a value.
- Read the result, or press ⇄ to swap the two units.
Common conversions
- 1 metre ≈ 3.281 feet; 1 mile ≈ 1.609 km.
- 1 kilogram ≈ 2.205 pounds; 1 stone ≈ 6.35 kg.
- 1 US cup ≈ 236.6 ml; 1 litre ≈ 33.8 US fl oz.
- 20 °C = 68 °F; water freezes at 0 °C / 32 °F.
How temperature differs
Length, weight, and volume convert by a simple multiplier. Temperature scales have different zero points, so the tool converts through Celsius using the proper formulas (for example, °F = °C × 9/5 + 32) rather than a single factor.
Why a unit converter is useful
- Following recipes written for another country's measurements.
- Reading product specs or travel distances in unfamiliar units.
- Schoolwork, DIY, and shipping weights.
It works offline
All the conversion factors are built into the page, so nothing is uploaded and the converter keeps working without a connection once loaded.
FAQ
How many millilitres in a US cup?
About 236.6 ml — see the Volume category.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32; the tool does it for you.
Is anything uploaded?
No — it runs entirely in your browser.
Ready to try it? Open the Unit Converter →