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Shift Duration Calculator

Work out shift duration instantly with clear inputs, formula shown and shareable results.

About Shift Duration Calculator

A shift from 22:15 to 06:00 crosses midnight, so the raw subtraction is negative and a day must be added - giving 7.75 gross hours. Deducting a 30 minute unpaid break leaves 7.25 paid hours. Getting the midnight wrap wrong is the single commonest error in night-shift timekeeping.

Formulas

Gross shift

minutes = end - start, adding 1440 if the result is not positive

Paid time

paid = gross - unpaid break

Worked example

With the default values below, Shift Duration Calculator returns Paid Hours of 7.250. Change any input above and every figure here is recalculated in your browser.

Inputs used

Shift start houraccepts 0–23
22
Shift start minuteaccepts 0–59
15
Shift end houraccepts 0–23
6
Unpaid breakminimum 0 min
30 min

Results

Paid Hours
7.250 h
Gross Shift Length
7.750 h
Paid Time As h:mm
7:15
Shift Pattern
Overnight shift crossing midnight

Step by step

  1. 1Values used
  2. 2Gross shift
  3. 3Paid time
  4. 4Paid Hours= 7.250 h
  5. 5Gross Shift Length= 7.750 h
  6. 6Paid Time As h:mm= 7:15
  7. 7Shift Pattern= Overnight shift crossing midnight

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why add a day when the end time is earlier?

Because the shift finished the following morning. Without the adjustment a 22:00 to 06:00 shift would compute as minus 16 hours.

Are rest breaks paid?

It depends on jurisdiction and contract. Short rest breaks are often paid while meal breaks usually are not.

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