Toolkit Shelf

Everyday Calculators

Time Duration Calculator

Use this time duration calculator to find hours and minutes between two times, subtract breaks, and estimate pay from an hourly rate.

Reviewed May 25, 2026EstimateFormula shown

Live calculator

Time duration

Net duration8h 0m

8h 30m before breaks.

Decimal hours8

Useful for timesheets, billing, and payroll estimates.

Estimated pay$200.00

Decimal hours multiplied by the hourly rate.

Formula

Time duration formula

Net duration = end time - start time - break time

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

How to use

Steps

  1. Enter the start time.
  2. Enter the end time.
  3. Add unpaid break minutes if needed.
  4. Use the decimal hours result for billing, payroll, or timesheets.

Example

Sample calculation

Start time9:00 AM
End time5:30 PM
Break30 minutes
Net duration8h 0m

Calculator use

Best for

  • Quick net duration from start time, end time and break minutes.
  • Quick everyday math with the result and formula in one place.
  • Shopping, date, time, unit, school, or household comparisons.
  • A fast check before moving the numbers into a spreadsheet.

Before relying on it

Check first

  • Entering start time, end time and break minutes from different time periods or scenarios.
  • Mixing units, dates, or original values across the same calculation.
  • Rounding early and then using the rounded number in another step.
  • Copying a result without checking whether the inputs match the real-world question.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions.

4 hoursHalf shift

Common for part-time work blocks and appointment windows.

8 hoursFull shift

A common baseline for workday and timesheet math.

12+ hoursLong day

Check overtime, break rules, or fatigue-sensitive schedules.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

Net duration = end time - start time - break time

Inputs used

Start time, End time, Break minutes, Hourly rate

Limitations

Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.

Last reviewed

May 25, 2026

Cite this page

Toolkit Shelf. Time Duration Calculator. Retrieved May 25, 2026, from https://toolkitshelf.com/tools/time-duration-calculator

FAQ

Common questions

How do I calculate hours between two times?

Subtract the start time from the end time. This calculator also subtracts break minutes and shows decimal hours.

Can this calculate overnight shifts?

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

Why use decimal hours?

Decimal hours are useful for timesheets, invoices, payroll estimates, and hourly billing.