What is 20°C in Fahrenheit?
20°C is 68°F. That's a comfortable room temperature.
Temperature conversion
Celsius to Fahrenheit converter calculator
Last updated:
To convert Celsius to Fahrenheit, multiply by 9/5 and add 32: °F = (°C × 9/5) + 32. Water freezes at 0°C = 32°F and boils at 100°C = 212°F at sea level.
Featured celsius to fahrenheit converter answer
Celsius
-40°C
Fahrenheit converter
-40°F (the scales cross here)
Formula: °F = (°C × 9/5) + 32. Open the live calculator to convert any value.
Formula
°F = (°C × 9/5) + 32
The factor 9/5 (or 1.8) converts the size of one Celsius degree into Fahrenheit degrees, because the gap from freezing to boiling is 100 Celsius degrees but 180 Fahrenheit degrees. The +32 shift accounts for the different zero points: 0°C is the freezing point of water, while 0°F was originally calibrated against a brine solution.
Common values
| From | To |
|---|---|
| -40°C | -40°F (the scales cross here) |
| 0°C | 32°F (water freezes) |
| 10°C | 50°F |
| 20°C | 68°F (room temperature) |
| 25°C | 77°F |
| 30°C | 86°F |
| 37°C | 98.6°F (human body) |
| 40°C | 104°F (heatwave) |
| 100°C | 212°F (water boils at sea level) |
| 180°C | 356°F (medium oven) |
Background
Daniel Gabriel Fahrenheit proposed his scale in 1724; Anders Celsius proposed his (originally inverted) in 1742. Most countries adopted Celsius after the SI revisions of the 20th century. The US, Bahamas, Cayman Islands, Liberia, Palau, and a few others remain on Fahrenheit for everyday use.
Common use cases
- Translate weather forecasts between metric and US temperature scales.
- Convert recipe temperatures when cooking from international instructions.
- Check thermostat and HVAC set points without manual calculation.
Frequently asked questions
What is the formula to convert C to F?
°F = (°C × 9/5) + 32, which is the same as °F = (°C × 1.8) + 32.
At what temperature are Celsius and Fahrenheit equal?
At -40°. -40°C and -40°F are exactly the same temperature. This is the only point where the two scales cross.
How do I quickly estimate Celsius to Fahrenheit in my head?
Double the Celsius number and add 30. For 20°C: 20 × 2 + 30 = 70°F (actual 68°F). For 25°C: 50 + 30 = 80°F (actual 77°F). Good enough for weather; use the exact formula for cooking or lab work.
What's a normal human body temperature in Fahrenheit?
37°C is 98.6°F. Healthy body temperature varies from about 36.1°C (97°F) to 37.2°C (99°F) depending on time of day, activity, and the individual.
More temperature conversions
Other pair-specific calculators in the temperature family: