Temperature
Fahrenheit back to Celsius
Undo the offset first, then undo the scaling. This ordering is what makes round-tripping exact.
The Formula
C = (F - 32) x 5/9
Undo the offset first, then undo the scaling. This ordering is what makes round-tripping exact.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| F | Reading in degrees Fahrenheit | — | Subtract 32 before multiplying, never after. |
What Each Symbol Means
F
Reading in degrees Fahrenheit
Subtract 32 before multiplying, never after.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to convert celsius to fahrenheit page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Convert Celsius To Fahrenheit, filed under Unit Conversion. Every number the guide produces comes from substituting into this one line.