Convert length, weight, temperature, area, volume, and speed between metric and imperial units instantly.
Students, travellers, cooks, and engineers converting everyday measurements.
Pick a category
Choose length, weight, temperature, area, volume, or speed.
Select the units
Choose the unit to convert from and the unit to convert to; use the swap button to reverse the direction.
Enter a value
Type your value and read the converted result instantly.
Converting between units from memory is where small, costly mistakes creep in — a recipe in cups when you only have scales, a distance in miles when your car shows kilometres, a temperature in Fahrenheit when you think in Celsius. The conversion factors are easy to half-remember and easy to apply the wrong way round, and temperature is especially tricky because it needs an offset, not a simple multiplication. This converter removes the guesswork across the everyday categories — length, weight, temperature, area, volume, and speed. Pick a category, choose the units to convert from and to (with a swap button to reverse them), and the result updates instantly. It uses precise SI conversion factors for accuracy, and handles temperature with the correct offset formulas for Celsius, Fahrenheit, and Kelvin rather than treating them as simple ratios. Everything runs in your browser, with no limits and no sign-up.
Travel
Convert miles to kilometres, or Fahrenheit to Celsius, when you’re somewhere that uses the other system.
Cooking & baking
Switch recipe amounts between cups, millilitres, grams, and ounces.
Study & work
Convert science and engineering units accurately for homework, labs, and reports.
DIY & home
Move between feet/inches and metres/centimetres for measuring and building.
Fitness & health
Convert weights between kilograms and pounds, or distances between miles and kilometres.
They use standard SI conversion factors and are accurate to six decimal places.
Yes. Temperature uses proper offset formulas (e.g. °F = °C × 9/5 + 32), not simple ratios, for Celsius, Fahrenheit, and Kelvin.
Length, weight/mass, temperature, area, volume, and speed, each with the common metric and imperial units.
Yes — the swap button flips the "from" and "to" units instantly.
Where units differ (such as US vs imperial gallons), they are listed separately so you pick the correct one.
No. All conversions run in your browser.
The conversion maths is fully client-side, so it keeps working without sending anything to a server.
Yes — completely free, with no limits or sign-up.