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Celsius ↔ Fahrenheit
Forward applies °F = °C×9/5+32. Reverse solves for Celsius. Values below 0 K are rejected.
Limitation: Point-temperature conversion only.
How to Convert °C and °F
Pick a direction and enter a temperature point. The worksheet blocks physically impossible values.
Choose °C → °F or °F → °C.
Point temperatures
These formulas convert temperature points, not temperature intervals (a 1°C rise is a 1.8°F rise).
What the Result Means
Forward applies °F = °C×9/5+32. Reverse solves for Celsius. Values below 0 K are rejected.
Worked Examples
Freezing
Inputs
Result
0×9/5+32 = 32.
Boiling reverse
Inputs
Result
(212−32)×5/9 = 100.
Check the other direction
Flip to reverse and paste the output to confirm you land back near the original value.
Frequently Asked Questions
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Documented exact or standard factors with reverse mode.
Formula
C → F
C × 9/5 + 32
F → C
(F − 32) × 5/9
Scientific Background
Assumptions: ITS-style linear relation between Celsius and Fahrenheit points. Limitations: no Kelvin UI on this pair page.
Sources & review
Celsius to Fahrenheit Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
August 2, 2026
Reference
nist.gov
https://www.nist.gov/pml/owm/si-units-temperatureFree Calculator Hub methodology
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