Peppermint said:
How can I tell Excel NOT to round up when it calculates?
Your words are ambiguous since, for example, Excel does
__not__ round "up" automatically.
I suggest that you post some specific examples; that is,
what cells or numbers are involved in the calculation, and
what result would like to see. Be sure to include some
"corner cases" so that your intent it clear.
Generally, you can force Excel to round the result down,
up or to the nearest decimal place. Use the Help to read
about ROUNDDOWN(), ROUNDUP() and ROUND(). If
those do mean your needs, take a look at some functions
in the See Also list.