Quick reference table
Common temperature conversions
| From | To |
|---|---|
| 1 °C | 33.80 °F |
| 1 °F | -17.22222222 °C |
| 1 °C | 274.15 K |
| 1 K | -272.15 °C |
| 1 °F | 255.9277778 K |
How to convert temperature
Celsius is used for everyday temperatures in most of the world, Fahrenheit in the United States, and Kelvin in science, where 0 K is absolute zero. Unlike most units, temperature scales are converted with an offset as well as a multiplier.
Temperature scales are converted through Kelvin. °F = °C × 9/5 + 32, °C = (°F − 32) × 5/9, K = °C + 273.15.
The converter above applies the right formula for the units you choose and shows the result instantly.
Worked examples
Celsius to Fahrenheit
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 °C | -40.00 °F |
| -10 °C | 14.00 °F |
| 0 °C | 32.00 °F |
| 20 °C | 68.00 °F |
| 25 °C | 77.00 °F |
| 37 °C | 98.60 °F |
| 100 °C | 212.00 °F |
| 180 °C | 356.00 °F |
Fahrenheit to Celsius
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 °F | -40.00 °C |
| -10 °F | -23.33333333 °C |
| 0 °F | -17.77777778 °C |
| 20 °F | -6.666666667 °C |
| 25 °F | -3.888888889 °C |
| 37 °F | 2.777777778 °C |
| 100 °F | 37.77777778 °C |
| 180 °F | 82.22222222 °C |
Temperature units explained
| Unit | Symbol |
|---|---|
| Celsius | °C |
| Fahrenheit | °F |
| Kelvin | K |
| Rankine | °R |
| Réaumur | °Ré |
Popular conversions: celsius to fahrenheit, fahrenheit to celsius, c to f.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (1.8) and add 32. For example, 20 °C is 20 × 1.8 + 32 = 68 °F.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value and multiply by 5/9. For example, 98.6 °F is (98.6 − 32) × 5/9 = 37 °C.
At what temperature are Celsius and Fahrenheit equal?
They are equal at −40 degrees: −40 °C is exactly −40 °F.
What is absolute zero?
Absolute zero is 0 K, which is −273.15 °C or about −459.67 °F. It is the lowest temperature that is theoretically possible.
How many °F is 1 °C?
1 °C = 33.80 °F, and 1 °F = -17.22222222 °C.
Does this temperature converter work offline?
Yes. After the page has loaded once, all calculations run in your browser, so it keeps working without an internet connection.