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Time Duration Calculator

Use this time duration calculator to find the hours and minutes between two clock times, with an optional break.

Primary answer
Net duration
Inputs to verify
Start time, End time, and Break
Use type
Use as a direct calculation check.
Keyword intent
time duration calculator

Calculator

Time Duration Calculator

Calculates net duration from start time, end time, break. Defaults are filled in so you can review a working example before changing inputs.

Use 24-hour time.

If end time is earlier, the calculator treats it as next day.

min

Break minutes subtracted from the duration.

Result

Result reflects the current submitted inputs.

  • Risk A
  • Reviewed 2026-05-26
  • 1 sources
Net duration7 h 15 min
Net hours7.25 hours
Before break7 h 45 min
  • Times are clock times without time zones.
  • Break time cannot exceed gross duration.

Accuracy notes

Risk level
A
Reviewed
2026-05-26
Sources
1
Primary result
Net duration

Formula logic is kept in a pure calculator module with fixtures, source notes, and page-visible assumptions.

Categories

What the result means

Net duration is the usable span after break minutes are removed. The decimal-hour value is the same duration converted for payroll sheets, invoices, study logs, or summaries, while the hours-and-minutes result is easier to read directly.

Net durationDisplayed as duration.
Net hoursDisplayed as decimal in hours.
Before breakDisplayed as duration.

Use the result this way

  1. Start with Net duration, then use supporting outputs for context.
  2. Verify Start time, End time, and Break before copying the result.
  3. Check the formula, example, and assumptions before reusing the answer.

User job

How to use this calculator

Use Time Duration Calculator when you need net duration, then use net hours and before break to check the context for calendar planning, work logs, schedules, eligibility checks, and duration comparisons.

Best for

  • Turning dates or clock times into a clear interval
  • Checking whether a deadline or duration is plausible
  • Reviewing a default example before entering your own start time and end time.

Check before relying

  • Confirm calendar convention, time zone, overnight handling, and whether endpoints should be included.
  • Times are clock times without time zones.
  • Break time cannot exceed gross duration.
  • Source context: International Organization for Standardization, reviewed 2026-05-26.

Next useful step

  • Hours CalculatorUse next when your task shifts from Time Duration Calculator to Hours Calculator.
  • Date CalculatorUse next when your task shifts from Time Duration Calculator to Date Calculator.
  • Age CalculatorUse next when your task shifts from Time Duration Calculator to Age Calculator.

Formula

Gross minutes = end time - start time, plus 24 hours for overnight spans. Net minutes = gross minutes - break minutes.

  • Gross minutes = end time - start time, plus 24 hours for overnight spans. Net minutes = gross minutes - break minutes.
  • Enter Start time and End time using 24-hour time. Break minutes must be zero or greater and cannot exceed the gross duration.
  • Last reviewed: 2026-05-26.

Inputs

Enter Start time and End time using 24-hour time. Break minutes must be zero or greater and cannot exceed the gross duration.

Start timeUse 24-hour time.
End timeIf end time is earlier, the calculator treats it as next day.
BreakBreak minutes subtracted from the duration.

Example

From 09:30 to 17:15 is 7 hours 45 minutes. Subtracting a 30-minute break gives 7 hours 15 minutes.

FAQ

Can this calculate overnight duration?

Yes. If the end time is earlier than the start time, the calculator treats the end as next day.

How do I enter 7:30 PM?

Use 24-hour format and enter 19:30. Keeping every time in the same notation prevents AM/PM conversion mistakes.

Can break time be longer than the shift?

No. Break minutes cannot exceed the gross time between start and end because that would create a negative net duration.

Why is decimal hours useful?

Decimal hours are useful for timesheets and summaries. For example, 7 hours 15 minutes is 7.25 hours.

What should I verify before using time duration calculator?

Verify start time, end time, and break, the displayed formula, and the worked example before copying the result into another document or decision.

What is the main output of time duration calculator?

Net duration is the first value to read. Use the supporting outputs and assumptions to understand why it changed.

Sources

Last reviewed: 2026-05-26

  • Reviewed 2026-05-26
    ISO 8601 time notationInternational Organization for Standardization. Time input uses 24-hour clock notation.