How to use this calculator
- Enter the start and finish on the first row, leaving other rows empty for a single interval.
- Change the thirty-minute sample deduction to the total unpaid break for that shift.
- Read the worked duration in H:MM and decimal hours, or add more rows to compare several days.
Formula
Net duration = elapsed minutes between endpoints − unpaid break minutes. An earlier finish rolls into the next day. With multiple work segments, add each duration first, then subtract only unpaid minutes not already excluded by segment gaps.
Worked examples
An 8.5-hour interval before deducting its break
Schedule: 8:30 of net worked time. The engine calculates 8:30 (8.50 hours).
Regular: 8:30 (8.50 h); overtime: 0:00 (0.00 h); double time: 0:00 (0.00 h). At $24.00 per hour, estimated gross pay is $204.00.
Elapsed duration versus net duration
An eight-and-a-half-hour span is not necessarily eight-and-a-half hours of work. A half-hour unpaid lunch leaves eight hours, while a paid break would remain inside the total. Decide which intervals should be excluded before entering a deduction. This page uses the shared card engine so a single shift and a longer schedule follow the same arithmetic. Clear unused rows when you need only one duration, then inspect that row rather than a prefilled weekly sum.
Review a duration that crosses midnight
For a shift beginning at 22:00 and ending at 06:00, the end time is interpreted as the following morning. The elapsed span is eight hours before any unpaid deduction. This convenient convention models a single overnight shift, not an interval lasting several calendar days. If your task crosses multiple days, divide it into clearly labeled segments and retain the dates in your own record. Do not infer dates from an AM/PM clock value alone.
Compare a whole span with split segments
One useful check is to calculate the full span minus its known unpaid intervals, then compare it with the sum of the separate worked segments. Those two methods should agree when they describe the same day. If they do not, look for a missing return punch or a deduction entered in both places. The row’s H:MM display is often easier for this comparison than a rounded decimal number, particularly for fifteen- or forty-five-minute breaks.
Frequently asked questions
Can I subtract several breaks?
Yes. Enter their combined unpaid minutes, or record work segments around each break. The latter keeps the intervals visible, while a single deduction is faster when only the total is known.
What happens when breaks exceed the shift?
The engine floors worked time at zero. A zero result is a reason to check the source inputs, not confirmation that an excessive deduction accurately describes the day.
Can I use this for non-work durations?
Yes, the subtraction works for any single overnight or same-day interval. Ignore overtime and pay columns when measuring an activity whose duration is the only result you need.