F to C Calculator
F to C calculator: convert Fahrenheit to Celsius (and Kelvin) instantly, with the formula and a worked example.
Editorial review: Farrow (pseudonym; identity and professional credentials are not disclosed). This page is for educational purposes, not professional advice.
Your inputs
Results update as you type. Nothing you enter leaves your device.
Results
- Kelvin
- 294.26 K
Example with the starting values
These results use the calculator's initial inputs. Change the values above to calculate your own estimate.
Inputs
- Temperature
- 70 °F
Results
- Celsius
- 21.11 °C
- Kelvin
- 294.26 K
How does the F to C Calculator work?
To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9: °C = (°F − 32) × 5/9.
For example, 98.6°F is (98.6 − 32) × 5/9 = 37°C, and 212°F is 100°C. Kelvin is Celsius plus 273.15.
Frequently asked questions
What is 100°F in Celsius?
100°F is about 37.8°C.
How do I convert F to C?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, 70°F is (70 − 32) × 5/9 = 21.1°C.
What is 32°F in Celsius?
32°F is exactly 0°C, the freezing point of water.
Is there a quick mental shortcut?
Subtract 30 and halve it. It is within a couple of degrees for everyday temperatures.
Related calculators
Practice it: Thermo Tune, a free fahrenheit to celsius game.