How to Calculate Overtime Pay: Formula and Examples

1. Gather the inputs before using a formula

Bring the relevant shifts, unpaid breaks, ordinary-hours threshold, pay period and overtime multiplier into one record. A monthly total alone may hide which workweek generated the additional hours.

Match the dates to the actual pay period. Overnight work, shifts crossing a payroll cutoff and retrospective corrections deserve an explicit note because otherwise two internally correct reports can still cover different time windows.

• Start and finish date-time for every shift
• Unpaid break duration
• Applicable weekly or contractual threshold
• Regular hourly rate or verified pay basis
• Overtime multiplier
• Payroll period boundaries

2. Identify the overtime hours

Calculate net hours for each shift by subtracting non-working breaks, then group those hours according to the rule that actually applies. Some systems use a workweek threshold, while others include daily limits, averaging arrangements, special occupations or collectively agreed rules.

For example, the U.S. Department of Labor explains that the federal FLSA generally requires overtime for covered, non-exempt employees after 40 hours in a workweek at no less than one and one-half times the regular rate. That is a U.S. federal example, not a global default; state law and other jurisdictions can differ.

3. Establish the regular hourly rate

An hourly worker may begin with the agreed hourly rate, subject to the applicable payroll rules. For a salaried worker, do not divide salary by an arbitrary number. The legal regular rate can include or exclude particular forms of compensation and may not equal a simple salary-to-hours conversion.

The U.S. Department of Labor, for example, describes the regular rate as total includable compensation for a workweek divided by total hours worked. Elsewhere, the definition may be different. Use a payslip, contract or payroll explanation to configure the personal estimate.

4. Use a transparent overtime formula

A simple personal estimate is: overtime amount = overtime hours × regular hourly rate × overtime multiplier. If the verified regular rate is 25, the qualifying overtime is 4 hours and the applicable multiplier is 1.5, the gross estimate is 4 × 25 × 1.5 = 150.

Do not merge a night differential, weekend premium, public-holiday rule and overtime premium into one label unless your payroll method genuinely treats them that way. Separate components are easier to audit and compare with a payslip.

5. Avoid the errors that change the result

Time errors usually create larger problems than arithmetic errors. Counting attendance instead of net working time, duplicating an overnight shift or leaving a live timer open can distort every calculation that follows.

The second group of errors concerns pay: mixing gross and net figures, assuming all overtime uses the same multiplier and treating a nominal salary conversion as a legal regular rate. Record the method alongside the number so it remains explainable.

• Counting unpaid breaks as work
• Double-counting a manual and live entry
• Applying one multiplier to every premium type
• Mixing calendar months with payroll periods
• Using net pay as a gross calculation basis
• Assuming one country’s threshold applies everywhere

6. Build a repeatable check in HourTally

HourTally keeps pay type, ordinary schedule and multipliers in the workplace profile, then connects those settings to live or manually entered shifts. Break and overlap checks improve the time record before an earnings estimate is produced.

At period end, review ordinary and overtime earnings separately and compare the hours with the payslip. A PDF, CSV or Excel-compatible export gives you a consistent record of the period and settings used for the estimate.