Here's the formula:

=IF(OR(ISTEXT(R15),ISTEXT(R16)),0+Q19,(R16+R15)+Q1 9)

R15 = 2, R16 = 8, Q19 = 96

The calculation should be 2 + 8 + 96 = 106, but it's giving me 107.

Here's where I think the error is occurring: the 2 and the 8 are calculated
based off the amount of time between two points during the day; 8 hours of
regular and 2 hours of overtime, or 10 hours of labor. That 10 hours is
calculated as follows:

=IF(ISBLANK(R13),"",(R13-R12)*24) where R13 = 6:30PM and R12 = 8:30 AM

So, if we go back to the first formula, this is where I get lost.
Obviously, somewhere, somehow, Excel is rounding but there's nothing to
round: 8:30AM - 6:30PM is 10 hours, even.

Ideas?

--
Brevity is the soul of wit.