The unit converter works like this: it converts instantly between length, weight, volume, area, speed, temperature, time, data-size and pressure units as you type, using exact conversion factors. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the Unit Converter
Enter or paste the source value.
Confirm the source and target units or formats.
Read the converted result, which updates live as you type.
Copy the output when you are happy with it.
Features
Convert length, weight, volume units online free
Instant result, no page reload
Works in any modern browser, desktop or mobile
Free with no signup
Common mistakes to avoid
Selecting a near-neighbor unit instead of the intended one
Forgetting whether a value is a rate or a total
Examples
Input
Result
5 miles
8.04672 km · 8,801.15 yards · 26,400 feet
Best used for
Converting recipes between metric and imperial
Engineering drawings with mixed unit systems
Travel distance and speed conversions
Science homework and lab work
Privacy
Conversion runs locally in your browser tab.
Frequently asked questions
Are the factors exact?
Yes for units with legal definitions (metre, kg, litre); US customary units use their exact equivalents (1 inch = 25.4 mm by international agreement since 1959).
Why does temperature need special handling?
Fahrenheit and Celsius scales have different zero points, so they convert by formula (°C × 9/5 + 32), not by multiplication - the tool handles this automatically.
Why do unit conversions update as I type?
Every keystroke re-runs the conversion chain from the source unit to the target through exact factors, so you can watch the target settle without pressing anything.
Related tools
Length Converter - Convert meters to feet, inches, miles, kilometers