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Free fahrenheit to celsius converter with instant bidirectional conversion. Enter F to get C, or enter C to get F. Includes Kelvin output and practical reference temperatures for weather, cooking, and science.
Last updated: April 16, 2026
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Temperature Formula
Celsius = (Fahrenheit - 32) x 5/9 and Fahrenheit = (Celsius x 9/5) + 32
Fahrenheit to Celsius
68 F = 20 C
Formula: (68 - 32) x 5/9 = 20.00 C
Kelvin
293.15 K
Rounded C
20 C
Common reference points
Formula
(F - 32) x 5/9
Convert any fahrenheit value to celsius in real time.
Formula
(C x 9/5) + 32
Reverse conversion for full flexibility.
Formula
K = C + 273.15
Useful for science and engineering contexts.
Water freezes
32 F = 0 C
Fast sanity checks for your conversion output.
Example
-40 F = -40 C
Great for weather and technical calculations.
Direction aware
F to C or C to F
Edit either field and get immediate converted values.
For 68 F, the equivalent temperature is 20 C.
Input
68 F
Output
20 C
This fahrenheit to celsius converter uses exact linear conversion formulas. Fahrenheit and celsius are two scales with different zero points and degree step sizes. The calculator applies the correct formula based on the field you edit.
C = (F - 32) x 5/9F = (C x 9/5) + 32K = C + 273.15These equations are mathematically exact and are used globally in weather, education, science, and engineering.
Result: 77 F equals 25 C
Warm day conditions in many regions.
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