Feature summary (what you would like to be able to do and where):
Just like on Wikipedia there often exist sections named "See also", it would be neat to reference related functions.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
The function named Convert C to F is directly related to the function named Convert F to C

Benefits (why should this be implemented?):

Linking both of these functions would help user having to deal with both units, or landing to this page by mistake when they wanted the other function.
It would also simply help to discover other functions related to the one being consulted.