This time duration calculator finds the elapsed time between two clock readings. Choose Same or Next yourself, then read the result as accumulated hours and minutes, decimal hours, total minutes, or total .
How to calculate time duration
Treat each clock reading as after midnight. The calculator adds the selected offset to the end, subtracts the start, and derives every displayed format from that elapsed- total.
Same keeps both readings on one date. Next moves the end reading to the following date.
Turn on precision when the source readings include . When it is off, both readings use whole-minute precision.
Use accumulated time for schedules, decimal hours for numeric records, or total for exact follow-on arithmetic.
Time duration examples
- Turn on precision for these examples.
- With 09:00:00 as the start, 17:00:00 as the end, and Same selected, the result is 8 0 0 , 8.0000 h, and 480 min.
- With 23:30:00 as the start, 00:10:00 as the end, and Next selected, the result is 0 40 0 , 0.6667 h, and 40 min.
Same-day and overnight time spans
Same requires the end clock reading to be no earlier than the start. If it is earlier, the calculator asks you to select Next instead of silently changing the date. Equal readings mean zero elapsed time on Same and one full on Next .
Hours, minutes, and decimal hours
All result formats come from the same elapsed- total. Decimal hours divide that total by 3,600 /h, while total minutes divide it by 60 /min. Accumulated hours do not wrap into a , and the calculator does not apply payroll rounding.
When to use a different time calculator
This clock-only tool does not model calendar dates, time zones, daylight-saving changes, leap , or spans beyond the next . A work-hours calculator is the better fit when unpaid breaks or more than one work interval change the total. A clock-out calculator starts with a desired paid duration and solves for the finishing . The decimal-hours calculator converts an existing duration in either direction without asking for clock readings. For adding or subtracting a duration from one clock reading, use the Time Calculator. This page compares entered readings; it does not run a stopwatch or live timer.
Use the Date Calculator to add or subtract calendar units or count the calendar dates between two dates. Calendar-date arithmetic keeps month-end and endpoint rules separate from clock durations.
When a weekly work schedule and closure dates determine which dates count, use the Business Days Calculator. It counts eligible calendar dates without turning them into paid work hours.
When a report needs an label, the Week Number Calculator returns the , number and weekday, and converts that identity back to a calendar date.