Celsius to Fahrenheit Converter (°C to °F)
1 celsius = 33.8 fahrenheit. Celsius places 0 degrees at the freezing point of water and 100 degrees at its boiling point; Fahrenheit uses 32 and 212 for the same points.
Result
21 °C = 69.8 °F
How to convert celsius to fahrenheit
Celsius places 0 degrees at the freezing point of water and 100 degrees at its boiling point; Fahrenheit uses 32 and 212 for the same points. The US uses Fahrenheit for weather and cooking, and most other countries use Celsius, so this is one of the most common conversions.
Formula
°F = °C × 9/5 + 32
Worked example
21 °C = 69.8 °F
Celsius to Fahrenheit quick-reference table
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 °C | -40 °F |
| 0 °C | 32 °F |
| 20 °C | 68 °F |
| 37 °C | 98.6 °F |
| 100 °C | 212 °F |
| 180 °C | 356 °F |
Real-life examples
Weather and ovens: 21 C is a comfortable 69.8 F room temperature, 180 C is a 356 F oven and 37 C is normal body temperature at 98.6 F.
Frequently asked questions
What is the formula to convert C to F?
Multiply by 9/5 (1.8) and add 32. For example 20 C x 1.8 + 32 = 68 F.
At what temperature are Celsius and Fahrenheit equal?
At -40 degrees, where -40 C equals -40 F.
What is a quick mental trick?
Double the Celsius figure and add 30: 20 C becomes about 70 F. It is within a degree or two for everyday weather.
What is 1 celsius in fahrenheit?
1 celsius = 33.8 fahrenheit (°C to °F).
What is the formula to convert °C to °F?
°F = °C × 9/5 + 32. For example, 21 °C = 69.8 °F.
How do I convert °F back to °C?
Use the reverse converter: 1 fahrenheit = -17.2222 celsius. Check: 69.8 °F converts back to 21 °C.
Reverse conversion
Need the other direction? Fahrenheit to Celsius converter (°F to °C): 1 fahrenheit = -17.2222 celsius.
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