Celsius to Fahrenheit formula
°F = (°C × 9⁄5) + 32
Example: (20°C × 9⁄5) + 32 = 68°F
Celsius to Fahrenheit mental math shortcut
For a quick estimate, double the Celsius temperature and add 30. This is usually close enough for everyday temperatures, although it is not the exact formula. For example, 20°C gives an estimate of 70°F, while the exact conversion is 68°F.
About the Celsius scale
The Celsius scale is widely used for everyday temperatures and scientific measurements. Under standard atmospheric pressure, water freezes at 0°C and boils at 100°C. The Celsius scale is also closely related to Kelvin: one degree Celsius has the same size as one kelvin, but the two scales have different zero points.
About the Fahrenheit scale
The Fahrenheit scale sets the freezing point of water at 32°F and its boiling point at 212°F under standard atmospheric pressure. Fahrenheit is used primarily in the United States, while Celsius is more common in most countries.
Reference table
| Celsius | Fahrenheit |
|---|---|
| −40°C | −40°F (same temperature) |
| 0°C | 32°F (freezing) |
| 20°C | 68°F (room temperature) |
| 37°C | 98.6°F (approximate body temperature) |
| 100°C | 212°F (boiling) |
Need the reverse direction? See Fahrenheit to Celsius.
Frequently asked questions
What is 20°C in Fahrenheit?
20°C is 68°F. Using the formula, (20 × 9/5) + 32 = 68.
Why do Celsius and Fahrenheit meet at −40?
Celsius and Fahrenheit are both linear scales, and −40 is the one temperature where their values are identical: −40°C = −40°F.
What is normal body temperature in Fahrenheit?
98.6°F (37°C) is a traditional reference value for body temperature. Actual body temperature varies between people and can change with time of day, activity, age, and measurement method.