THE EVERYDAY CONVERTER
Metric & imperial
unit converter
Convert a number, type a measurement or paste a whole list. Instant answers, clear formulas and no sign-up.
Length
Decimals and fractions welcome. Even 1 ½.
The same value, a few more ways.
Click a unit to use itGood to know
Smart precision shows up to 10 significant digits. Other settings round to the chosen decimal places. Scientific notation keeps very large and small results readable, including values that would otherwise round to zero. Calculations use the unrounded value. Feet-and-inches, stone-and-pounds and hours-and-minutes answers round the smaller unit to two decimal places.
Number formats: 1,000 means one thousand; 1,5 means one and a half. You can also use 1 000 or 1.000,5.
More than one number?Convert a whole list in one go.Open list converter
Convert a list of measurements
One measurement per line. Use the units below, or add a unit to any line.
Up to 200 lines. Decimals, fractions and mixed units welcome.
Your converted list will appear here.
Everything stays in your browser.
THE ONES YOU REACH FOR
Common unit conversions
Recent conversions 0
Only on this device.
Answers as you type.No calculate button to hunt for.
The detail is your choice.Fractions, precision and clear definitions.
A little tool. All yours.Calculations stay in your browser.
Common conversions, explained
Use these exact relationships for length and mass. Temperature needs an offset as well as a multiplier.
| Conversion | Formula | Example |
|---|---|---|
| Inches to centimetres | inches × 2.54 | 12 in = 30.48 cm |
| Centimetres to inches | centimetres ÷ 2.54 | 25.4 cm = 10 in |
| Feet to metres | feet × 0.3048 | 6 ft = 1.8288 m |
| Kilograms to pounds | kilograms ÷ 0.45359237 | 1 kg ≈ 2.204622622 lb |
| Celsius to Fahrenheit | (°C × 9 ÷ 5) + 32 | 20°C = 68°F |
| Fahrenheit to Celsius | (°F − 32) × 5 ÷ 9 | 68°F = 20°C |
Working with paper or picture frames? Use our A paper size and frame guide to compare A0–A10, calculate mount openings and plan a wall display.
What can I convert?
Length, weight, temperature, area, volume, speed, time, data, pressure, energy, power and angle: 12 categories with 104 labelled units. UK and US liquid measures and decimal and binary data units are kept separate.
Useful details before you convert
Can I enter feet, inches and fractions?
Yes. Try “5 ft 8 in to cm” or “1/2 inch to mm” in the typed conversion box. The first equals 172.72 cm; the second equals 12.7 mm. For a list, enter one measurement per line.
Why are UK and US pints different?
An imperial pint is 568.26125 mL; a US liquid pint is 473.176473 mL. Choose the labelled version. A cup also needs its definition: this tool distinguishes metric cups from US cups.
Does rounding change the calculation?
Precision controls the displayed result. Calculations retain the unrounded value. Smart precision shows up to ten significant digits; very small nonzero results use scientific notation instead of appearing as zero.
Are my measurements saved?
Favourites, recent single conversions and preferences are stored in this browser. List inputs are not saved. Sharing a conversion includes its value and units in the URL, so only share measurements you want others to see.
Definitions: NIST conversion factors and binary data units. Tool reviewed 2 November 2026 by Your Image 2 Canvas.
Preparing a photograph for printing? See our canvas image sizing guide for pixels, resolution and wrap allowances.
Found a problem? Tell us the measurement and units so we can check it.