What are constants for in Excel?
Constants are fixed values, so they never change. They are used
in formulas where you know a particular value does not change. If
you have a formula that is always going to multiply something by 2,
then the 2 is a fixed value and can be entered into the formula as
a constant, while the other value will be a cell reference, so it
can have a variable value, like in the following formula.
=H5 * 2