Convert degree Fahrenheit to degree Celsius
Convert degrees Fahrenheit (°F) to degrees Celsius (°C) instantly.
1 °F =
-17.22222 °C
degrees Celsius
Need the reverse? Convert degree Celsius to degree Fahrenheit →
Formula
°C = (°F − 32) × 5/9
degree Fahrenheit to degree Celsius conversion table
About converting degrees Fahrenheit to degrees Celsius
Fahrenheit to Celsius is needed when a US temperature has to be read in the metric scale used almost everywhere else — weather forecasts, oven settings, and body temperature. Subtract 32 first, then scale by 5/9.
Method & sources
Conversions use exact legal definitions rather than rounded approximations: 1 inch = 2.54 cm and 1 pound = 0.45359237 kg (fixed by the 1959 international yard and pound agreement), 1 mile = 1.609344 km, and 1 US liquid gallon = 3.785411784 litres. Temperatures convert with °F = °C × 9⁄5 + 32 and K = °C + 273.15. Results are rounded only for display.
- NIST Special Publication 811 — Guide for the Use of the SI
- NIST Handbook 44, Appendix C — General Tables of Units of Measurement
Page last updated: October 1, 2026
Frequently asked questions
How many degrees Celsius are in a degree Fahrenheit?
One degree Fahrenheit equals -17.22222 degrees Celsius. So 10 degrees Fahrenheit is -12.22222 degrees Celsius. Use the converter above for any value.
What is the formula to convert degrees Fahrenheit to degrees Celsius?
°C = (°F − 32) × 5/9
Is the degree Fahrenheit-to-degree Celsius conversion exact?
Yes. Temperature scales convert by an exact formula, not an approximation, so the result is precise for any input.
Related conversions
Related tools
These free tools pair well with this page — open them in a new tab to finish your workflow.