About the Unit Converter
Tezmy's Unit Converter handles the conversions people look up every day: centimetres to inches, kilograms to pounds, Celsius to Fahrenheit, litres to gallons, square metres to square feet, km/h to mph, minutes to hours and megabytes to gigabytes. Pick a category, type a value, and see the answer instantly, plus a table showing the same value in every other unit of that kind. All conversion factors use exact international definitions.
Updated October 2026
How to use the Unit Converter
- 1Pick what you're converting, for example Length or Weight.
- 2Type the value you want to convert.
- 3Choose the From and To units. Use the swap button to flip them.
- 4Read the answer, or check the table for every other unit.
The 8 categories
- Length: mm, cm, m, km, inches, feet, yards, miles.
- Weight: grams, kilograms, ounces, pounds, stones, tonnes.
- Temperature: Celsius, Fahrenheit, Kelvin.
- Volume: ml, litres, teaspoons, cups, pints, gallons (US and UK).
- Area: square metres, square feet, acres, hectares.
- Speed: km/h, mph, m/s, knots.
- Time: seconds to years.
- Data: bytes, KB, MB, GB, TB and their binary KiB, MiB, GiB versions.
Handy conversions to remember
- 1 inch = 2.54 cm exactly, and 1 foot = 30.48 cm.
- 1 kg ≈ 2.205 lb, and 1 lb ≈ 0.454 kg.
- °F = °C × 9/5 + 32, so 37 °C is 98.6 °F.
- 1 mile ≈ 1.609 km, and 100 km/h ≈ 62 mph.
- 1 US gallon ≈ 3.785 litres; 1 UK gallon ≈ 4.546 litres.
See every unit at once
Below the main answer, a table shows your value in every other unit of the same kind. That's handy when you don't know which unit a recipe, form or product page wants, or when comparing sizes and speeds quickly.
Exact, official factors
Conversions use the exact international definitions, like the inch being exactly 2.54 cm. Results are shown with sensible rounding, so they're precise enough for science homework and practical enough for cooking and shopping. Conversions are often part of a bigger task. Work out a share of a total with the Percentage Calculator, check your weight in the right unit with the BMI Calculator, and count the days to a trip with Days Between Dates.
Features
- 8 categories and 70+ units
- Metric, imperial and US units
- Exact international conversion factors
- Instant answers as you type
- See a value in every unit at once
- Works offline once loaded
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 centimetres. So to turn centimetres into inches, divide by 2.54. For example, 30 cm is about 11.81 inches.
How do I convert kilograms to pounds?
Multiply by about 2.20462. One kilogram equals 2.20462 pounds, so 70 kg is about 154.3 lb.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 25 °C × 1.8 + 32 = 77 °F. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F).
What's the difference between a US and a UK gallon?
A US gallon is 3.785 litres while a UK (imperial) gallon is 4.546 litres, about 20% bigger. Both are available in the Volume category.
Why are there KB and KiB?
KB, MB and GB use powers of 1000 (the way drive makers count). KiB, MiB and GiB use powers of 1024 (the way many operating systems count). That's why a “500 GB” drive shows about 465 GiB.
How do I convert my height from cm to feet and inches?
Choose Length, enter your height in cm and read the feet and inches. For example, 170 cm is about 5 ft 7 in.
How many pounds is 70 kg?
70 kg is about 154.3 lb. Type any weight to convert it instantly.
Does it work offline?
Yes. Once the page is loaded, conversions run on your device without an internet connection.
How many ml are in a cup?
A US cup is about 237 ml, while recipes in the UK, Australia and many other countries use a metric cup of 250 ml.