Math
Fahrenheit to Celsius Converter
Switch degrees from one scale to another without mistakes
Type a temperature and pick its unit: we convert Fahrenheit to Celsius and Kelvin, or the other way around, instantly.
The key idea
Converting to Celsius is not just dividing: you subtract 32 first
The Fahrenheit scale has a different zero: at normal pressure, water freezes at 32 °F and boils at 212 °F. That is why 32 °F is 0 °C, not 32 °C, and halving the degrees is not enough. The exact formula is °C = (°F − 32) × 5/9, so 77 °F is 25 °C.
How it is calculated
°C = (°F − 32) × 5/9 °F = °C × 9/5 + 32 K = °C + 273.15
Quick mental trick from °C to °F: double it and add 30 (approximate). 20 °C → about 70 °F (exact: 68 °F). From °F to °C, do the reverse: subtract 30 and halve.
Worked example
77 °F = (77 − 32) × 5/9 = 25 °C = 298.15 K. A 100.4 °F fever is 38 °C.
Official sources
- NIST Special Publication 811: Guide for the Use of the International System of Units · kelvin and degree Celsius
Typical cases
Fahrenheit to Celsius chart
Common temperatures in °F and their equivalent in °C, from freezing to body temperature and boiling water.
| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40.00 °C |
| 0 °F | -17.78 °C |
| 32 °F | 0.00 °C |
| 40 °F | 4.44 °C |
| 50 °F | 10.00 °C |
| 60 °F | 15.56 °C |
| 65 °F | 18.33 °C |
| 68 °F | 20.00 °C |
| 70 °F | 21.11 °C |
| 72 °F | 22.22 °C |
| 75 °F | 23.89 °C |
| 80 °F | 26.67 °C |
| 90 °F | 32.22 °C |
| 98.6 °F | 37.00 °C |
| 100 °F | 37.78 °C |
| 212 °F | 100.00 °C |
Save or share this table as an image Typical cases
Oven temperatures: Celsius to Fahrenheit
For recipes written in °C: the oven setting in °F.
| Celsius | Fahrenheit |
|---|---|
| 100 °C | 212.00 °F |
| 120 °C | 248.00 °F |
| 140 °C | 284.00 °F |
| 150 °C | 302.00 °F |
| 160 °C | 320.00 °F |
| 170 °C | 338.00 °F |
| 175 °C | 347.00 °F |
| 180 °C | 356.00 °F |
| 190 °C | 374.00 °F |
| 200 °C | 392.00 °F |
| 220 °C | 428.00 °F |
| 230 °C | 446.00 °F |
| 250 °C | 482.00 °F |
Save or share this table as an image Common questions
Frequently asked questions
How do I convert Fahrenheit to Celsius?
Subtract 32 and multiply by 5/9: °C = (°F − 32) × 5/9. For example, 77 °F is 25 °C and 100 °F is 37.78 °C.
How do I convert Celsius to Fahrenheit?
Multiply by 1.8 and add 32: °F = °C × 1.8 + 32. For example, 25 °C is 77 °F.
At what temperature are Fahrenheit and Celsius the same?
At −40 degrees: −40 °F is exactly −40 °C. It is the only point where both scales read the same.
What is 350 °F in Celsius?
About 176.67 °C; on an oven dial in Celsius, the closest setting is usually 175 or 180 °C. Other common oven settings: 375 °F is 190.56 °C and 400 °F is 204.44 °C.
What is Kelvin?
It is the SI unit of temperature, and its zero is absolute zero, −273.15 °C or −459.67 °F. It is written K, without “degrees”: 32 °F is 273.15 K.
What is 98.6 °F in Celsius?
It is exactly 37 °C. If a thermometer or a leaflet from another country says 38 °C, that is 100.4 °F.
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