About °F → °C
US thermostats, older oven marks, and some medical thermometers read Fahrenheit. Travelers and chefs convert F to C to match metric instructions.
Subtract 32, then multiply by 5/9 to reach Celsius.
Opposite direction from c-to-f.
Temperature
Fahrenheit to Celsius Converter
US thermostats, older oven marks, and some medical thermometers read Fahrenheit. Travelers and chefs convert F to C to match metric instructions.
How to use this tool
Type Fahrenheit value. Calculate for Celsius.
Formula & methodology
This fahrenheit to celsius converter applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.
C = (F - 32) x 5/9
Tips for accurate results
- 350 F is about 177 C for baking.
- Negative F values are colder than negative C—scales cross at -40.
- Reverse: c-to-f.
- Allow oven preheat time after setting converted temp.
Frequently asked questions
98.6 F in C?
About 37 C.
-40 F equals -40 C?
Yes, an intersection point of the scales.
Free?
Yes.
Room temp?
68 F is about 20 C.
Sources & references
The factors and formulas used by this tool follow these references:
- NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
- BIPM — The International System of Units (SI Brochure, 9th edition)
Last reviewed: September 2026. Found an error? Tell us and we will correct it.
Further reading
Guides that explain the ideas behind this calculator.
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