8am to 4pm Is How Many Hours?
Measure a clock span, including overnight, or add and subtract hh:mm durations. 09:00 to 17:00 is 8:00. A 30-minute break makes it 7:30.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
An 8am to 4pm shift spans exactly 8 hours. This page opens the duration calculator with 08:00 and 16:00 preloaded — the early-start counterpart of the 9-to-5, common in manufacturing, construction, schools, and clinics.
Eight clock hours rarely mean eight paid hours: subtract a 30-minute lunch and the 8-to-4 day is 7.5 worked hours; subtract a full hour and it is 7. Enter your break in minutes and the calculator shows the net duration in hh:mm alongside decimal hours and total minutes.
Need a different shift? Change either time — the tool handles any pair of clock times, even spans that cross midnight, and a second mode adds or subtracts hh:mm durations directly.
Example. 09:00 to 17:00 is 8:00, 480 minutes, 8.00 hours. A 30-minute break makes 7:30, 450 minutes, 7.50 hours. 21:00 to 05:00 is an overnight 8:00.
Limit. Clock times are 00:00–23:59. A break longer than the span is rejected. 09:00 to 09:00 is zero, not 24 hours. Durations can be negative when you subtract.