Shift Calculator
Work out a shift, including the overnight ones
One shift at a time: length, paid hours after breaks, whether it crosses midnight, and where it sits in a rotating pattern.
Questions people ask
The things that come up about shift calculators, answered plainly.
How long is a 12-hour shift after breaks?
Usually 11 or 11.5 paid hours, depending on the break rule. The page applies the statutory minimum for your jurisdiction if you pick one, or whatever you enter.
How does a 4-on-4-off rotation average out?
To 42 hours a week on twelve-hour shifts — more than a standard week, which is why those rotations usually build in extra rest days over a longer cycle. The page shows the average for each pattern.
Related tools
Timesheets, shifts, overtime and billable hours, added up correctly.
Work Hours CalculatorStart, finish, break — for one shift or a whole week. Totals in hours and minutes and in decimal hours, with overnight shifts handled and nothing sent anywhere.
Rotation Schedule CalculatorA round-robin rota from a list of names and a shift length — day by day, with handovers marked and each person's total shown so the split is visibly fair.
Overtime CalculatorHours split into regular, time-and-a-half and double time on the rule you pick, with the pay for each band and the total.
Timesheet CalculatorSeven rows, start and finish and break in each, totals per day and for the week — in hours and minutes and in decimal — copyable in one click.