Celsius to Fahrenheit Converter
Unit ConversionConvert Celsius to Fahrenheit using the standard formula F = C times 9/5 plus 32.
Fahrenheit
Equivalent temperature in Fahrenheit
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Unit Conversion calculators
This calculator converts Celsius to Fahrenheit using the standard formula: multiply the Celsius value by 9/5 (or 1.8), then add 32. Enter any value above for an instant result.
Unlike a simple ratio conversion, Celsius and Fahrenheit have both a different scale AND a different zero point, since 0 degrees Celsius (freezing) equals 32 degrees Fahrenheit, not 0. That offset of 32 is why the formula adds a constant term instead of just multiplying.
A real conversion table covering common temperatures, along with genuinely useful reference points like body temperature and the exact point where both scales agree, is below.
Celsius to Fahrenheit conversion table
This table covers the Celsius values most commonly searched and converted, from below freezing to above the boiling point of water.
| Celsius | Fahrenheit |
|---|---|
| -40°C | -40°F |
| -20°C | -4°F |
| -10°C | 14°F |
| 0°C | 32°F |
| 10°C | 50°F |
| 15°C | 59°F |
| 18°C | 64.4°F |
| 20°C | 68°F |
| 22°C | 71.6°F |
| 25°C | 77°F |
| 30°C | 86°F |
| 35°C | 95°F |
| 37°C | 98.6°F |
| 40°C | 104°F |
| 45°C | 113°F |
| 50°C | 122°F |
| 100°C | 212°F |
The Celsius to Fahrenheit formula
To convert Celsius to Fahrenheit, multiply by 9/5 (1.8), then add 32. For example, 21.5°C × 1.8 = 38.7, then 38.7 + 32 = 70.7°F.
To go the other way, from Fahrenheit back to Celsius, subtract 32 first, then divide by 1.8. For example, (70.7 - 32) ÷ 1.8 = 21.5°C.
Key temperature reference points
A few specific temperatures come up constantly in real conversions, each with genuine significance beyond the arithmetic:
- 0°C = 32°F, the freezing point of water
- 100°C = 212°F, the boiling point of water at sea level
- 37°C ≈ 98.6°F, normal average human body temperature
- 37.8°C ≈ 100°F, a common threshold used to define a fever
- -40°C = -40°F, the one temperature where both scales read the exact same number
- -273.15°C = -459.67°F, absolute zero, the coldest temperature theoretically possible
The -40 crossover point isn't a coincidence: solving the conversion formula for the temperature where Celsius equals Fahrenheit gives exactly -40, since that's the one point where the 1.8x scaling and the +32 offset cancel out to leave the same number on both scales.
Frequently Asked Questions
What is the formula to convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (or 1.8), then add 32.
What is 100 degrees Celsius in Fahrenheit?
100 degrees Celsius equals 212 degrees Fahrenheit, the boiling point of water at sea level.
What is normal human body temperature in Fahrenheit?
Normal average human body temperature is about 37°C, which converts to approximately 98.6°F, though a healthy range varies slightly by person and time of day.
What temperature is considered a fever?
A common threshold is 37.8°C (about 100°F) or above, though the exact definition can vary slightly between medical sources.
Is there a temperature where Celsius and Fahrenheit are the same number?
Yes, exactly -40 degrees. -40°C equals -40°F, the one point where both scales read the identical value.
Is there a quick mental-math shortcut for Celsius to Fahrenheit?
A common approximation is to double the Celsius value and add 30, which gets close for everyday temperatures. It's less accurate than the real formula (multiply by 1.8, add 32), but fast for a rough estimate.
Why does the formula add 32 instead of just multiplying?
Celsius and Fahrenheit don't share the same zero point. 0°C (freezing) equals 32°F, not 0°F, so the formula needs a constant offset in addition to the 9/5 scaling factor to account for that difference.
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