Time Calculations

[Dgwood90]

I need a formula that will subtract battery run time and show time left.
For example
battery run time = 40 hours
Time running = 25 hours
Time Left = 15 hours
Everything I have tried relates to a 24 hour time.

 

[Bob Phillips]

Just use

=A2-A1

 

[dlw]

Actually, thats' not time as in a clock, those are just numbers, format the
cell :

custom ### "hours"