The Shift Differential Pay Calculator estimates additional earnings for hours worked at a premium rate, such as evening, night, weekend, or hazardous shifts. It supports either a percentage premium or a flat dollar premium per hour and shows total shift pay, base pay, and the added differential.
Employers may apply different rules by shift window, job classification, overtime status, union agreement, or location. Enter the premium exactly as defined by the relevant policy and calculate overtime separately unless the policy states how the differential affects the overtime rate.
1. Enter the base rate
Use the ordinary hourly rate before shift premiums.
2. Enter eligible hours
Include only hours that fall within the qualifying shift or category.
3. Choose the premium inputs
Enter a percentage, a flat amount per hour, or both when the policy combines them.
4. Review added pay
The breakdown separates ordinary pay from the shift differential.
5. Check overtime treatment
Confirm whether the differential must be included in an overtime regular-rate calculation.
Premium per hour = Base rate × Percentage premium + Flat premium
Differential pay = Premium per hour × Eligible hours
Total shift pay = Base rate × Eligible hours + Differential pay
Enter the percentage as a percent value, such as 12 for 12%. The model does not automatically calculate overtime.
The result is the total gross pay for the differential-eligible hours under the entered premium structure.
Payroll rules may require different treatment when overtime, multiple premiums, minimum shift payments, or collective agreements apply.
Given: Base rate is $24 per hour, 32 hours qualify, and the night premium is 12% with no flat premium.
Calculation: Premium per hour = $24 × 12% = $2.88. Differential pay = $2.88 × 32 = $92.16. Base pay = $24 × 32 = $768.
Result: Total shift pay is $860.16, equivalent to an effective rate of $26.88 per hour.
Yes. The calculator adds both amounts to the base rate. Use both only when the governing policy actually combines them.
Only if you are calculating the shift differential portion and will handle overtime correctly elsewhere. Overtime rules may require the premium to be included in the regular rate.
Calculate each group of hours separately, then add the totals. Combining unlike premiums into one average can hide payroll errors.
No. It is a gross-pay estimate before payroll taxes, benefits, garnishments, or other deductions.
A shift differential rewards work during specified shifts or conditions. Overtime pay is triggered by hours or legal and contractual thresholds, and the two can interact.