Fahrenheit to Celsius
Temperature scales do not share a zero point, so they convert by formula rather than by a single factor.
Converter
Fahrenheit to Celsius at a glance
18 rows| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.88888889 °C |
| -10 °F | -23.33333333 °C |
| 0 °F | -17.77777778 °C |
| 5 °F | -15 °C |
| 10 °F | -12.22222222 °C |
| 15 °F | -9.444444444 °C |
| 20 °F | -6.666666667 °C |
| 25 °F | -3.888888889 °C |
| 30 °F | -1.111111111 °C |
| 35 °F | 1.666666667 °C |
| 37 °F | 2.777777778 °C |
| 40 °F | 4.444444444 °C |
| 50 °F | 10 °C |
| 75 °F | 23.88888889 °C |
| 100 °F | 37.77777778 °C |
| 150 °F | 65.55555556 °C |
| 200 °F | 93.33333333 °C |
Quick pairs
tap to loadHow the fahrenheit to celsius conversion works
Celsius, Fahrenheit and Kelvin are the everyday three; the rest are historical scales still met in old texts.
Temperature scales have different zero points, so a single multiplier is not enough. To go from Fahrenheit to Celsius, multiply by 0.5555555556, then minus 17.77777778:
Celsius = Fahrenheit × 0.5555555556 - 17.77777778
Reverse the operations to convert the other way: subtract first, then divide.
Questions
What is the formula for Fahrenheit to Celsius?
Multiply the Fahrenheit reading by 0.5555555556, then subtract 17.77777778.
Which units does this temperature converter cover?
8 units in total, all referenced to the kelvin. They include kelvin, celsius, fahrenheit, rankine, réaumur, delisle and more. Pick any pair from the two dropdown lists.
How precise are the results?
Every conversion is computed in your browser at double precision from the factors listed on this page, which follow the SI definitions and the exact international agreements for imperial and US customary units. Use the Decimals control to round the display without changing the underlying value.
Does anything I type leave my device?
No. The converter is plain JavaScript running locally, with no server round-trip, and the page keeps working offline once loaded.