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Time Duration Calculator

Find how much time there is between two times, or two dates and times.

Clock format

Duration

0 hrs 0 min

Decimal hours
0.00
Total minutes
0
h:mm
0:00
Total seconds
0

    Examples

    Two times on the same day

    A driver logs on at 8:47 AM and off at 5:12 PM. 8:47 AM to 4:47 PM is 8 hours, plus 25 minutes to 5:12 PM: 8 hrs 25 min, or 8.42 decimal hours.

    Several days, across a clock change

    An on-call shift runs from Friday, March 6, 2026 at 6:00 PM to Monday, March 9 at 7:30 AM. On the calendar that’s 2 days 13 hours 30 minutes. But U.S. clocks sprang forward on Sunday, March 8, so an hour was skipped: the real time on duty is 2 days 12 hrs 30 min (60.5 hours). With Include dates ticked, the calculator measures this for your time zone and adds a note.

    Common shift lengths

    Durations for typical work shifts, including two overnight ones.

    ShiftDurationDecimalLess 30-min lunch
    6:00 AM – 2:30 PM8 h 30 min8.508.00 h
    7:00 AM – 3:00 PM8 h8.007.50 h
    7:00 AM – 3:30 PM8 h 30 min8.508.00 h
    8:00 AM – 4:30 PM8 h 30 min8.508.00 h
    8:00 AM – 5:00 PM9 h9.008.50 h
    8:30 AM – 5:00 PM8 h 30 min8.508.00 h
    9:00 AM – 5:00 PM8 h8.007.50 h
    9:00 AM – 5:30 PM8 h 30 min8.508.00 h
    3:00 PM – 11:00 PM8 h8.007.50 h
    11:00 PM – 7:00 AM8 h8.007.50 h
    7:00 PM – 7:00 AM12 h12.0011.50 h

    How the duration is measured

    duration = end − start

    Without dates, both times are counted from midnight. If the end is earlier than the start, the span must have crossed midnight, so a day is added: 11:15 PM to 1:40 AM is 2 hours 25 minutes. That covers anything up to 24 hours.

    With dates, the calculator measures the real time that passed between the two moments in your device’s time zone, which is why daylight-saving changes are counted correctly. An unpaid break, if entered, is taken off the total.

    Frequently asked questions

    How do I work out the time between two times by hand?
    Subtract the start from the end, borrowing an hour as 60 minutes when the minutes don’t go. For 9:50 AM to 2:15 PM: 14:15 − 9:50 = 13:75 − 9:50 = 4 hours 25 minutes.
    How many hours are there between 8 AM and 5 PM?
    Nine: 4 hours to noon and 5 hours after. With a 1-hour unpaid lunch, that’s 8 hours of work.
    How do I calculate the time between two times in Excel?
    With the times in A2 and B2, use =(B2-A2)*24 for decimal hours, or =B2-A2 formatted as [h]:mm. If the span can cross midnight, use =MOD(B2-A2,1)*24. Google Sheets uses the same formulas.