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Free celsius to fahrenheit converter with instant bidirectional conversion. Enter C to get F, or enter F to get C. Also includes Kelvin output and helpful reference temperatures for daily weather, cooking, and science use.
Last updated: April 16, 2026
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Temperature Formula
Fahrenheit = (Celsius x 9/5) + 32 and Celsius = (Fahrenheit - 32) x 5/9
Celsius to Fahrenheit
25 C = 77 F
Formula: (25 x 9/5) + 32 = 77.00 F
Kelvin
298.15 K
Rounded F
77 F
Common reference points
Formula
(C x 9/5) + 32
Convert any celsius value to fahrenheit in real time.
Formula
(F - 32) x 5/9
Switch scales accurately for weather, labs, and cooking.
Formula
K = C + 273.15
Useful for scientific and engineering contexts.
Water freezes
0 C = 32 F
Handy checks when validating your conversion result.
Example
-40 C = -40 F
Great for climate, refrigeration, and technical use.
Direction aware
C to F or F to C
Edits in either field automatically drive the calculation.
For 25 C, the equivalent temperature is 77 F.
Input
25 C
Output
77 F
This celsius to fahrenheit converter uses exact linear conversion formulas. Fahrenheit and celsius are two scales with different zero points and different degrees per interval. The calculator applies the correct formula instantly based on the field you edit.
F = (C x 9/5) + 32C = (F - 32) x 5/9K = C + 273.15These equations are mathematically exact and widely used across weather, education, science, and engineering.
Result: 68 F equals 20 C
This is a standard room temperature.
Share it with friends, students, and coworkers who need quick temperature conversions.
Suggested hashtags: #Temperature #Conversion #Celsius #Fahrenheit #Calculator