=B1-A1-C1/24

or. if lunchtime is eneterd as # of minutes:

=B1-A1-C1/24/60

<will the formula return 7.5 if the user had a half hour?

No, 8:30 :-)

--
Kind regards,

Niek Otten
Microsoft MVP - Excel

"Kris" wrote in message
...
I need a formula that will calculate some time for me. Here is what I
have.
I have a box where a user types in 8:00 AM meaning they start worked at
8:00
in the morning. They then type in 5:00 PM for when they end work. There
also is a cell that they input their amount of time at lunch, say 1 hour.

I need the formula to subtract 8 Am from 5 PM and then subtract the 1 hour
lunch. So I should get 8 hours.

Also, will the formula return 7.5 if the user had a half hour?