FORMULAS, SHAPES, TIME, AND NUMBER TOOLS
Calculate the net duration between decimal 24-hour start and end times, including an overnight period and an optional break.
Your result
Enter your values and choose Calculate. Your inputs stay on this device.
Duration = end − start, adding 24 hours when the interval crosses midnight, then subtracting the break.
One continuous interval only. Decimal 9.5 means 09:30; time zones, dates, attendance policy, and paid-break rules are excluded.
This duration tool handles a single same-day or overnight interval and keeps any deducted break explicit.
Find elapsed time between two clock readings, including an overnight interval when selected.
Build a reliable scenario
Time Duration Calculator helps you check a specific math & geometry question with figures that apply to you. Calculate the net duration between decimal 24-hour start and end times, including an overnight period and an optional break. Find elapsed time between two clock readings, including an overnight interval when selected. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.
Prepare Start time in 24-hour decimal, End time in 24-hour decimal and Break to subtract. Review the formula and assumptions shown for this time duration calculator. Enter start and end as 24-hour decimal values and an unpaid break if relevant. Calculate and read gross and net hours separately. Use an official attendance record for payroll, legal, or institutional purposes. Keep units, dates, currency, and time periods consistent.
The stated method is: Duration = end − start, adding 24 hours when the interval crosses midnight, then subtracting the break. Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.
One continuous interval only. Decimal 9.5 means 09:30; time zones, dates, attendance policy, and paid-break rules are excluded. Check the input and rounding, then calculate again.
Source and update
Last reviewed: 2026-08-22
This tool performs the stated formula locally in your browser using the values you enter.
This duration tool handles a single same-day or overnight interval and keeps any deducted break explicit.
Read gross and net hours separately. The result changes whenever an input or assumption changes.
Use an official attendance record for payroll, legal, or institutional purposes.
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