Temperature Converter
Convert temperature between Celsius, Fahrenheit and Kelvin, both ways, instantly and exactly. Type a value and read it in all three scales. A free temperature converter that runs in your browser, with no sign-up.
Read a temperature in the scale you understand. Enter a figure in Celsius, Fahrenheit or Kelvin and the other two update at once, so you can make sense of a foreign forecast, set an oven from a recipe written in the other system, or switch to Kelvin for science work. It handles C to F, F to C and Kelvin all in one place.
- Exact, standard factors
- 100% free
- No sign-up, no app
- Instant as you type
- Works offline after first load
1 °C in every unit
How to use it
- 1
Enter a temperature
Type a value into any scale, such as 20°C or 68°F.
- 2
Pick the scale
Choose which scale you entered. The tool fills in the other two automatically.
- 3
Compare all three
See Celsius, Fahrenheit and Kelvin side by side, and copy the one you need.
When it comes in handy
Weather and travel
Make sense of a forecast in the scale you are not used to, Celsius or Fahrenheit.
Cooking and ovens
Convert an oven temperature between Celsius and Fahrenheit so a recipe comes out right.
Science and study
Switch to Kelvin for physics and chemistry work where absolute temperature is needed.
Instant, exact & 100% in your browser
The conversion runs right here in your browser using exact, standard factors. Nothing you type is sent to a server, there is no sign-up and no limit, and once the page has loaded it keeps working even with no connection.
Frequently asked questions
- How do I convert Celsius to Fahrenheit?
- Multiply the Celsius temperature by 9, divide by 5, then add 32. So 20°C becomes 20 × 9 ÷ 5 + 32 = 68°F. To go the other way, subtract 32 first, then multiply by 5 and divide by 9. The converter does this for you and shows all three scales at once.
- What temperature is the same in Celsius and Fahrenheit?
- Minus 40 degrees is the same in both scales: −40°C equals −40°F. It is the one point where the two scales cross, which is a handy fact to remember and a quick way to sanity-check a conversion.
- What is Kelvin and when is it used?
- Kelvin is the absolute temperature scale, starting at absolute zero, the coldest possible temperature. It uses the same size of degree as Celsius, so a change of one kelvin equals a change of one degree Celsius; 0°C is 273.15 K. It is the standard scale in science.
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