The formula
To convert °F to °C, use: °C = (°F − 32) × 5/9
Fahrenheit to Celsius
Convert °F to °C instantly — with the formula, a table, key reference temperatures, and a live calculator.
100 °F equals 37.78 °C.
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Result (°C)
°F to °C table
| °F | °C |
|---|---|
| -40 °F | -40 °C |
| 0 °F | -17.78 °C |
| 14 °F | -10 °C |
| 32 °F | 0 °C |
| 50 °F | 10 °C |
| 68 °F | 20 °C |
| 77 °F | 25 °C |
| 86 °F | 30 °C |
| 98.6 °F | 37 °C |
| 100 °F | 37.78 °C |
| 104 °F | 40 °C |
| 122 °F | 50 °C |
| 212 °F | 100 °C |
°C to °F (reverse)
| °C | °F |
|---|---|
| -40 °C | -40 °F |
| -20 °C | -4 °F |
| -10 °C | 14 °F |
| 0 °C | 32 °F |
| 5 °C | 41 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 40 °C | 104 °F |
| 50 °C | 122 °F |
| 100 °C | 212 °F |
Key temperatures
| Reference point | °F | °C |
|---|---|---|
| Absolute zero | -459.67 °F | -273.15 °C |
| Freezing point of water | 32 °F | 0 °C |
| Comfortable room | 69.8 °F | 21 °C |
| Body temperature | 98.6 °F | 37 °C |
| Hot summer day | 104 °F | 40 °C |
| Boiling point of water | 212 °F | 100 °C |
How it scales
Freezing, body & boiling point
°F (°F)°C (°C)
Reference points in °C
Why temperature conversions need an offset
Unlike length or speed, temperature scales have different zero points. Celsius starts at water's freezing point (0 °C), Kelvin at absolute zero (0 K = −273.15 °C), and Fahrenheit at a historical reference (0 °F ≈ −17.8 °C). That is why a single multiplier is not enough — you also need an offset.
Absolute zero is 0 K = −273.15 °C = −459.67 °F — nothing can be colder. For more pairs, use our temperature conversion hub.
Related conversions
Frequently asked questions
How do I convert °F to °C?
Use the formula °C = (°F − 32) × 5/9. For example, 25 °F equals -3.89 °C.
What is the formula for °F to °C?
The exact conversion formula is: °C = (°F − 32) × 5/9.
What is 0 °F in °C?
0 °F equals -17.78 °C.
What is absolute zero?
Absolute zero is the lowest possible temperature: 0 K = −273.15 °C = −459.67 °F. Nothing can be colder.
Why can't I convert temperatures with a single factor?
Temperature scales have different zero points. Celsius starts at water's freezing point, Kelvin at absolute zero, and Fahrenheit at a historical reference. That is why conversions need an offset, not just a multiplier.
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