Overtime Pay Calculator Guide: Work Out Extra Pay for Hourly, Shift, and Salaried Workers
Use this practical overtime pay calculator guide to estimate gross overtime earnings, check the figures on a payslip, and identify which details—such as unpaid breaks, shift premiums, weekend rates, or salary status—need to be confirmed in your contract and local employment rules.
Overview
The basic question is simple: how much should I be paid for overtime? The calculation is usually less straightforward because employers may use different workweeks, overtime thresholds, premium rates, and payroll periods. Some workers receive overtime after a set number of weekly hours; others may qualify after a daily threshold, on particular holidays, or under a collective agreement. Some salaried employees are eligible for overtime, while others are treated as exempt under applicable rules.
This guide gives you a repeatable worksheet rather than a single universal answer. It helps you estimate:
- your ordinary hourly rate;
- the overtime rate created by a premium or multiplier;
- gross pay for regular and overtime hours;
- the effect of unpaid breaks, night work, weekends, and holidays; and
- the difference between cash overtime and compensatory time off.
Always separate an estimate from a legal entitlement. Overtime rules vary by country, state, province, territory, industry, contract, and worker classification. Your employer’s written policy and the relevant employment authority should take priority when they differ from this worksheet.
How to estimate overtime pay
Start with the hours that were actually worked and paid. Then apply the appropriate rate to each category of time.
Step 1: Find the regular hourly rate
If you are paid hourly, your regular rate is usually the stated hourly wage before deductions. If you are paid an annual salary, use this estimate:
Estimated hourly rate = annual salary ÷ paid weeks per year ÷ regular hours per week
For example, a salary of 52,000 currency units, paid across 52 weeks, for a 40-hour workweek gives an estimated hourly equivalent of 25:
52,000 ÷ 52 ÷ 40 = 25
This is a comparison figure, not proof that the employee is entitled to overtime. Salary arrangements may include different expected hours, unpaid leave, bonuses, allowances, or legal exemptions.
Step 2: Identify the overtime multiplier
Convert the premium into a multiplier before calculating. A rate described as “time and a half” is 1.5 times the regular rate. Double time is 2.0 times the regular rate. If a policy says overtime is paid at a 25% premium, the multiplier is 1.25.
Overtime hourly rate = regular hourly rate × overtime multiplier
For a regular rate of 18 and a time-and-a-half multiplier, the overtime rate is:
18 × 1.5 = 27 per overtime hour
Step 3: Calculate overtime earnings
Use the number of qualifying overtime hours, not simply every hour shown on a schedule.
Overtime pay = qualifying overtime hours × overtime hourly rate
Then calculate regular pay separately and add the two amounts:
Total gross pay for the period = regular-hours pay + overtime pay + applicable premiums
Gross pay is the amount before income tax, social contributions, pension deductions, insurance, or other payroll withholdings. For a take-home estimate, use a separate salary after tax guide.
Inputs and assumptions
Record these inputs before using an overtime pay calculator. Keeping the assumptions visible makes it easier to explain a discrepancy to payroll.
| Input | What to check |
|---|---|
| Pay basis | Hourly, weekly, monthly, annual salary, commission, or a combination |
| Regular rate | The ordinary rate used for the relevant pay period |
| Qualifying threshold | The weekly, daily, shift, or other threshold in the applicable policy or rule |
| Overtime multiplier | For example, 1.25, 1.5, or 2.0, if applicable |
| Hours worked | Start and finish times, unpaid breaks, training, travel, and required preparation |
| Shift premium | A fixed amount or percentage for night, weekend, holiday, or difficult shifts |
| Pay period | The dates covered by the payslip and the payroll cut-off date |
Unpaid breaks and split shifts
Do not automatically count the entire time between clock-in and clock-out. If a break is genuinely unpaid and you are free from work duties, it may need to be excluded from paid hours. However, the treatment of interrupted breaks, required availability, travel between work locations, training, opening or closing duties, and split shifts can depend on local rules and workplace policy.
Night, weekend, and holiday work
A weekend or night shift is not automatically the same as overtime. It may carry a separate shift differential, or it may qualify for overtime only after a threshold is reached. Check whether the premium is added to the hourly rate or replaces another premium.
For example, if the regular rate is 20 and a night premium is 2 per hour, a policy might calculate overtime from 20 and add the 2 premium, or calculate the overtime multiplier from 22. Those methods produce different results. Use the exact wording in the policy instead of assuming.
Compensatory time
Some workplaces offer time off instead of additional cash. The conversion may not be one hour off for every hour worked, particularly where an overtime premium would otherwise apply. Record the agreement, conversion rate, expiry date, and approval requirements. Do not treat compensatory time as cash pay unless the policy clearly says it is paid out.
Worked examples
Hourly worker with weekly overtime
Assume an employee earns 18 per hour, works 40 regular hours, and works 6 additional qualifying overtime hours at 1.5 times the regular rate.
- Regular pay: 40 × 18 = 720
- Overtime rate: 18 × 1.5 = 27
- Overtime pay: 6 × 27 = 162
- Estimated gross pay: 720 + 162 = 882
This example assumes all 6 extra hours qualify, there are no other premiums, and the stated threshold and multiplier apply to the whole pay period.
Weekend shift with a separate premium
Assume a worker earns 20 per hour, works 8 weekend hours, and receives a 2-per-hour weekend premium. If the written policy says the weekend hours are paid at the regular rate plus the premium, the estimate is:
8 × (20 + 2) = 176
If those same hours also qualify for overtime at 1.5 times the base rate, the result could instead be 8 × (20 × 1.5) + (8 × 2) = 256. Another policy might multiply the premium as well. The arithmetic is clear only after the pay rule is clear.
Salaried worker checking an hourly equivalent
Assume an annual salary of 52,000, 52 paid weeks, and a 40-hour regular week. The estimated hourly equivalent is 25. If 5 qualifying overtime hours are paid at 1.5 times that figure, the estimated overtime amount is:
25 × 1.5 × 5 = 187.50
Before relying on this result, the employee should confirm whether the salary includes overtime, whether the role is overtime-eligible, and which salary components belong in the rate calculation.
When to recalculate
Recalculate overtime whenever an input changes—not only when your hourly wage changes. A new schedule, promotion, salary arrangement, shift pattern, or payroll policy can change the result.
- At the start of a new payroll or tax year: Review thresholds, multipliers, salary assumptions, and workplace policies.
- After a pay increase or role change: Update the regular rate and confirm whether allowances or bonuses affect the calculation.
- When accepting shift work: Ask whether night, weekend, holiday, or on-call premiums stack with overtime.
- After a schedule change: Recount paid hours and unpaid breaks using actual start and finish times.
- When reviewing a payslip: Compare regular hours, overtime hours, rates, premiums, and the pay-period dates separately.
- Before comparing job offers: Compare expected overtime, guaranteed pay, benefits, and schedule reliability rather than relying on the headline salary alone. Our guide to comparing job offers can help organize those figures.
Keep a dated record of schedules, time entries, approvals, payslips, and written policy terms. If the estimate and payslip do not match, ask payroll to show which hours and rate were used. For a possible underpayment or disagreement about entitlement, consult the appropriate employment authority, worker representative, or qualified adviser in your location.
For related planning, use the holiday entitlement calculator guide to review paid time off alongside overtime and total compensation.
