Fahrenheit to Celsius converter
Convert Fahrenheit (°F) to Celsius (°C). Calculate a value, check the formula and compare common measurements.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same temperature quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Multiplying Celsius or Fahrenheit by a scale factor without applying the offset.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the temperature measurement guide · Calculation checks, sources and review limits
How do I convert Fahrenheit to Celsius?
Enter the value in Fahrenheit to find the same temperature quantity in Celsius. The number changes to match the unit; the underlying quantity stays the same. Check the definitions below when a unit has more than one convention.
Common uses
- Interpret a temperature reading in another scale.
- Compare values stated in Celsius, Fahrenheit, Kelvin or Rankine.
How it works
For the displayed direction, 1 °F equals -17.2222222222 °C. The engine converts through the shared temperature base quantity. Temperature scales use offsets and scaling. Absolute temperature cannot be below zero kelvin. Use the scale-specific transformation, rather than multiplying by a constant. Keep full precision until the final result; displayed answers use up to 12 significant digits.
Worked example
10 °F converts to -12.2222222222 °C. For the reverse direction, swap the units and enter -12.2222222222 °C; the result is approximately 10 °F.
FAQ
How do I convert °F to °C?
target = convert source via kelvin (offset and scale)
Which definition is used?
Temperature scales use offsets and scaling. Absolute temperature cannot be below zero kelvin.
Common values
Use “Swap units” above for the reverse conversion. Values below are rounded to six significant digits.
| Fahrenheit | Celsius |
|---|---|
| 1 | -17.2222 |
| 5 | -15 |
| 10 | -12.2222 |
| 20 | -6.66667 |
| 30 | -1.11111 |
| 50 | 10 |
| 100 | 37.7778 |