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.

Does this work offline and is anything sent to a server?

The conversion runs entirely in your browser, so nothing you type is sent anywhere, and once the page has loaded it keeps working with no connection. There is no sign-up and no limit on how many conversions you make.

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.

Exact, standard factors
100% free
No sign-up, no app
Instant as you type
Works offline after first load

Read the guide: How to Convert Celsius to Fahrenheit

Convert

From

33.8°F

1 °C = 33.8 °F

1 °C in every unit

Celsius1 °C

Fahrenheit33.8 °F

Kelvin274.15 K

How to use it

1
Enter a value

Type the number you want to convert. The result updates as you type, with no button to press.
2
Pick the units

Choose what you are converting from and to. Swap them with one click if you need the reverse.
3
Read or copy

See the exact result, plus a table of your value in every unit. Copy any line 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.
Does this work offline and is anything sent to a server?: The conversion runs entirely in your browser, so nothing you type is sent anywhere, and once the page has loaded it keeps working with no connection. There is no sign-up and no limit on how many conversions you make.