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Night Hours Calculator

Find how many hours of a shift fall inside the night window (for example 22:00–06:00), the day hours, and the pay with a night premium — overnight shifts handled automatically.

Shift start

Shift end

Night window starts

Night window ends

Regular hourly wage

Night premium

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How it works

night hours = minutes of the shift that fall between the night start and night end (the window may cross midnight) ÷ 60 · day hours = shift hours − night hours · pay = shift hours × rate + night hours × rate × premium %

Many contracts, collective agreements and labor codes pay a premium for night work, defined as hours within a fixed window — commonly 22:00 to 06:00, though 21:00–06:00, 23:00–07:00 and 19:00–06:00 are also used. Only the part of the shift inside the window earns the premium, so a 18:00–02:00 shift has four night hours, not eight. The ILO Night Work Convention (No. 171) defines night work as a period of at least seven consecutive hours including midnight to 05:00. Unpaid breaks are not deducted here; subtract them from whichever part of the shift they fall in.

Worked example

A shift from 18:00 to 02:00 lasts 8 hours. With a 22:00–06:00 night window, the hours from 22:00 to 02:00 are night work: 4.00 h night and 4.00 h day. At $20/h with a 25% night premium the premium is $20.00 and the shift pays $180.00.

Sources: ILO Night Work Convention, 1990 (No. 171)

Frequently asked questions

How do I calculate night hours in a shift?

Count only the part of the shift inside the night window. For 18:00–02:00 with a 22:00–06:00 window, the night hours are 22:00–02:00, which is 4 hours.

What hours count as night work?

It depends on your contract or local law: 22:00–06:00 is common, but some places use 21:00–06:00 or 19:00–06:00. Enter your own window.

How is night premium pay calculated?

Multiply the night hours by your hourly rate and the premium percentage. Four night hours at $20/h with a 25% premium add $20 to the shift.

Does the calculator handle shifts past midnight?

Yes. If the end time is earlier than the start, the shift is treated as ending the next day.

Related calculators

Shift Differential Pay Calculator

Add a night, evening or weekend shift differential to a base wage and see the boosted hourly rate and total pay.

Time Card Calculator with Breaks & Overtime

Turn a clock-in, clock-out and unpaid break into paid hours and pay — splitting daily regular and overtime hours at your chosen threshold and multiplier.

Time Addition Across Midnight Calculator

Add hours and minutes to a clock time and get the correct result when it rolls past midnight — with the day offset and 24-hour form.

Hours Worked Calculator

Calculate hours worked from start and end times minus breaks — one shift or a full weekly timesheet with split and overnight shifts — with daily or weekly overtime, time-clock rounding and gross pay.

Estimates for planning only. Your employment contract, collective agreement and local labor law decide what you are actually owed; check with your employer, payroll team or a qualified adviser before relying on a figure.