Fahrenheit to Celsius Converter
To convert Fahrenheit to Celsius, use the formula C = (F - 32) × 5/9. For example, 25 Fahrenheit equals -3.888888889 Celsius. Use the calculator above for your value, or check the examples and reference table below.
Formula
C = (F - 32) × 5/9
Use the temperature formula to convert Fahrenheit values to Celsius.
Example Conversions
0 Fahrenheit (F)
-17.77777778 Celsius (C)
1 Fahrenheit (F)
-17.22222222 Celsius (C)
25 Fahrenheit (F)
-3.888888889 Celsius (C)
100 Fahrenheit (F)
37.77777778 Celsius (C)
212 Fahrenheit (F)
100 Celsius (C)
Conversion Table
| Fahrenheit (F) | Celsius (C) |
|---|---|
| 0 | -17.77777778 |
| 1 | -17.22222222 |
| 10 | -12.22222222 |
| 20 | -6.666666667 |
| 25 | -3.888888889 |
| 32 | 0 |
| 37 | 2.777777778 |
| 50 | 10 |
| 75 | 23.88888889 |
| 100 | 37.77777778 |
| 212 | 100 |
| 273.15 | 133.9722222 |
How to Convert Manually
Use these steps to convert Fahrenheit values to Celsius without the calculator.
- Write down the value in Fahrenheit (F) that you want to convert.
- Apply the formula: C = (F - 32) × 5/9.
- For example, converting 10 Fahrenheit gives -12.22222222 Celsius.
- Label the result as Celsius (C).
About Fahrenheit and Celsius
The degree Fahrenheit sets water's freezing point at 32 °F and boiling point at 212 °F, dividing the interval into 180 degrees. The US uses it for weather, cooking, and medicine. The degree Celsius is the SI temperature unit for everyday use, with 0 °C at the freezing point and 100 °C at the boiling point of water at standard pressure. It is offset from the kelvin by exactly 273.15. The two scales are related by the formula C = (F - 32) × 5/9. Fahrenheit is used in US weather forecasts and thermostats and in US oven and recipe temperatures. Celsius is used in weather forecasts outside the US.
Precision and Rounding:Temperature conversions are formula-based, not factor-based, so apply the full formula before rounding. Whole degrees are fine for weather and cooking; lab work, medicine, and HVAC commissioning usually carry one or two decimal places.
See our guide to converting temperature manually for a full walkthrough of the formulas.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Fahrenheit equals-9.444444444Celsius.
15 F -> -9.444444444 C
FAQ
How do I convert Fahrenheit to Celsius?
Use the temperature formula to convert Fahrenheit values to Celsius.
What is the formula for Fahrenheit to Celsius?
The formula is C = (F - 32) × 5/9.
How many Celsius are in 1 Fahrenheit?
1 Fahrenheit equals -17.22222222 Celsius.
Can I convert Celsius back to Fahrenheit?
Yes. 1 Celsius equals 33.8 Fahrenheit, and the related converter can reverse the calculation.
What are common names for Fahrenheit and Celsius?
Fahrenheit is shown as F and may also be searched as fahrenheit, °F. Celsius is shown as C and may also be searched as celsius, centigrade, °C.
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