Fahrenheit to Celsius
Convert fahrenheit to celsius (°F to °C). 68 °F = 20 °C. Use the calculator, formula and conversion table.
How to convert fahrenheit to celsius
Use the scale and offset in this formula. Celsius, Fahrenheit and Kelvin have different zero points.
°C = (°F − 32) × 5 ÷ 9Worked example
68 °F = 20 °C. Change the amount in the calculator above to use your own value.
Units and assumptions
Converts temperature units using their scale factors and offsets. Temperatures below absolute zero are rejected. Oven fan adjustments are a separate calculation.
Calculator results use floating-point arithmetic and are rounded for display. The reference table below uses up to 12 significant digits.
Fahrenheit to Celsius table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 | -40 |
| 0 | -17.7777777778 |
| 32 | 0 |
| 68 | 20 |
| 212 | 100 |
About this conversion
What is the formula for fahrenheit to celsius?
°C = (°F − 32) × 5 ÷ 9. Use the scale and offset in this formula. Celsius, Fahrenheit and Kelvin have different zero points.
How do I convert back to fahrenheit?
Use the celsius to fahrenheit calculator to reverse this conversion. You can also use Swap units in the calculator above.
Can I use a different pair of units?
Choose another unit in the calculator, or open the temperature converter to browse all supported pairs.