Number Anvil
All tools

All tools

Temperature converter

Celsius, Fahrenheit, kelvin and Rankine, with the formula for each.

Result

68 °F

°F = °C × 9/5 + 32

How we got this

  1. The formula: °F = °C × 9/5 + 32
  2. Put in 20 °C: the result is 68 °F
The same value in every unit
degrees Celsius20 °C
degrees Fahrenheit68 °F
kelvins293.15 K
degrees Rankine527.67 °R

Worked out on your device. Nothing is sent anywhere.

Common conversions

Degrees Celsius to degrees Fahrenheit
Degrees Celsius (°C)Degrees Fahrenheit (°F)
-40-40
-20-4
-1014
032
1050
2068
2577
3086
3798.6
40104
100212
Degrees Fahrenheit to degrees Celsius
Degrees Fahrenheit (°F)Degrees Celsius (°C)
0≈ -17.77777778
320
5010
6820
72≈ 22.22222222
98.637
100≈ 37.77777778
212100
350≈ 176.6666667
400≈ 204.4444444
450≈ 232.2222222

The definitions

Temperature scales differ in both the size of a degree and where zero is, so converting means multiplying and adding: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level.

Kelvin starts at absolute zero, the coldest anything can be: 0 K is −273.15 °C or −459.67 °F, so K = °C + 273.15. Rankine is the Fahrenheit-sized equivalent, used in some US engineering. Kelvins are written without a degree sign.

Questions

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 (or 1.8) and add 32. 20 °C × 1.8 = 36, plus 32 is 68 °F. A rough version in your head: double it and add 30.

How do I convert Fahrenheit to Celsius?

Subtract 32, then multiply by 5/9. 98.6 °F − 32 = 66.6, and 66.6 × 5/9 = 37 °C, normal body temperature.

At what temperature are Celsius and Fahrenheit the same?

At −40. −40 °C is exactly −40 °F.

What are common oven temperatures in Celsius?

350 °F is about 177 °C (recipes usually say 180 °C), 400 °F is about 204 °C (200 °C) and 450 °F is about 232 °C (230 °C).

Is anything I enter sent anywhere?

No. Conversions are worked out in your browser. The value and units appear in the page address only so you can bookmark or share them.

More calculators