EngiRef / Temperature conversion
Convert Degrees Fahrenheit to Degrees Celsius (°F to °C)
°C = °F × 0.555555556 - 17.7777778. Convert degrees Fahrenheit to degrees Celsius with the exact formula, a common-values table and a free converter.
Conversion formula
°C = °F × 0.555555556 - 17.7777778
Temperature scales set their zero in different places, so this is an offset conversion, not a ratio. There is no single number you can multiply by: °F 0 is -17.7777778 °C, and doubling the input does not double the result. Apply the multiplier, then the offset, in that order.
°F to °C table
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| 0 °F | -17.7777778 °C |
| 1 °F | -17.2222222 °C |
| 2 °F | -16.6666667 °C |
| 5 °F | -15 °C |
| 10 °F | -12.2222222 °C |
| 20 °F | -6.66666667 °C |
| 50 °F | 10 °C |
| 100 °F | 37.7777778 °C |
Every figure is computed at build time by the site’s own converter from the temperature unit registry. For a value that is not listed, put it into the interactive converter.
Frequently asked questions
What is 1 °F in °C?
1 °F is -17.2222222 °C. Because temperature scales are offset rather than proportional, this figure is not a multiplier: 100 °F is 37.7777778 °C, not 100 times -17.2222222.
What is the formula to convert degrees Fahrenheit to degrees Celsius?
°C = °F × 0.555555556 - 17.7777778. Apply the multiplier first, then the offset. Every value in the table on this page is computed with that formula by the same converter the tool below runs.
How do I convert degrees Celsius back to degrees Fahrenheit?
Use the inverse formula, °F = °C × 1.8 + 32. The °C to °F page carries the same table in that direction.