Formula
Overtime minutes = max(0, paid shift minutes − standard hours × 60). Regular minutes = paid shift minutes − overtime minutes.
Work & Payroll
Overtime Calculator
Estimate regular and overtime hours after unpaid breaks and a chosen standard-hour threshold.
Calculator
Working calculator
Live result1h 30m8h 00m regular · 1h 30m overtime
Formula used
Overtime minutes = max(0, paid shift minutes − standard hours × 60). Regular minutes = paid shift minutes − overtime minutes.
This is the method behind the answer, so the result can be checked rather than simply trusted.What-if check
Standard-hour threshold sensitivity
Same paid shift, compared against common daily thresholds. This keeps the arithmetic separate from the workplace rule that decides which threshold applies.
| Standard day | Overtime | Change from current |
|---|---|---|
| 6 hours | 3h 30m | +2h 00m |
| 7.5 hours | 2h 00m | +0h 30m |
| 8 hours | 1h 30m | Current result |
| 10 hours | 0h 00m | -1h 30m |
| 12 hours | 0h 00m | -1h 30m |
Visual proof
Regular vs overtime split
The blue segment is paid time inside the selected standard threshold. The gold segment is paid time above that threshold.
Printable calculation report
Result: 1h 30m. Assumption: The standard threshold is entered by the user and must come from the rule you are checking.
- Start hour
- 8
- Start minute
- 0
- Finish hour
- 18
- Finish minute
- 0
- Unpaid break
- 30
- Standard hours
- 8
- Page/date context
- 2026-05-16 UTC page version
- Page URL
- https://calculationtime.com/calculators/overtime-calculator
Worked example
8:00 to 18:00 is 600 elapsed minutes. Minus 30 minutes break = 570 paid minutes. A standard 8-hour day is 480 minutes, so overtime is 570 − 480 = 90 minutes, or 1 hour and 30 minutes.
Professional note
Master’s Tip: decide the threshold before trusting the result. Daily overtime, weekly overtime, weekend penalties and public-holiday rules can all produce different payroll outcomes from the same raw shift.
Regional and unit assumptions
Defaults assume an 8-hour standard day because it is a common planning threshold. No named payroll standard is claimed; change the threshold to match the workplace, award, contract or local convention you are checking.
Assumptions and limitations
- The standard threshold is entered by the user and must come from the rule you are checking.
- Break minutes are unpaid and deducted before overtime is measured.
- The calculator separates regular minutes from overtime minutes, but it does not apply pay-rate multipliers.
- This is a planning calculator using transparent general arithmetic, not a legal payroll ruling.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Overtime minutes = max(0, paid shift minutes − standard hours × 60). Regular minutes = paid shift minutes − overtime minutes.
Standard or basis
Defaults assume an 8-hour standard day because it is a common planning threshold. No named payroll standard is claimed; change the threshold to match the workplace, award, contract or local convention you are checking.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master's Tip
Master’s Tip: decide the threshold before trusting the result. Daily overtime, weekly overtime, weekend penalties and public-holiday rules can all produce different payroll outcomes from the same raw shift.
Related calculators
Questions
Is overtime calculated before or after breaks?
This calculator deducts unpaid breaks first, then compares paid time with the standard-hours threshold.
What if I worked less than the standard day?
Overtime is zero. The result only counts paid time above the threshold.
Can this calculate overtime pay?
No. It calculates overtime time only. Pay needs the correct base rate, multiplier and governing payroll rule.
Which standard-hours threshold should I use?
Use the threshold from the contract, award, employer policy or local law you are checking. The default 8-hour value is only a planning example.
Can weekly overtime change the answer?
Yes. A shift may have no daily overtime but still contribute to weekly overtime once the full pay period is counted.
Calculation note
Overtime calculations combine simple time arithmetic with workplace rules. This page shows the arithmetic first: paid shift minutes minus a chosen standard threshold. Legal entitlement, rate multipliers and weekly totals belong to the governing rule set, not to a generic calculator.
Overtime starts with paid minutes, not clock span
A ten-hour clock span is not automatically ten paid hours. Unpaid breaks are deducted before this calculator compares the paid total with the selected standard-hours threshold.
The threshold is a rule choice
The same paid shift can produce different overtime totals under a 7.5-hour, 8-hour, 10-hour or weekly threshold. The sensitivity table on this page shows that change so the calculation is not mistaken for a legal decision.
Time and pay are separate questions
This calculator reports overtime duration only. Overtime pay may depend on the base rate, multiplier, day of week, public holidays, industry awards, employment contracts and local payroll law.
Sources and further readingU.S. Department of Labor: Overtime payFair Work Ombudsman: Overtime pay