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Shift Differential Pay Calculator

Enter your base rate, hours, and shift differential to see total pay.

How it is calculated

The tool adds a differential to the base hourly rate and multiplies by the hours worked on that shift. There are two modes. In percent mode (the default) differential rate = base × diff ÷ 100; in fixed per hour mode the differential is the amount you type, in money per hour. Then effective rate = base + differential rate, differential pay = differential rate × hours and total pay = effective rate × hours. The base rate, hours and differential are all required, and the same differential is applied to every hour entered, so enter only the hours of the premium shift. Overtime multipliers, taxes and deductions are not included, and the result is gross pay.

Worked example

Base rate 20 per hour, 40 hours on a night shift, with a 10% differential. Differential rate = 20 × 10 ÷ 100 = 2 per hour. Effective rate = 20 + 2 = $22.00 per hour. Differential pay = 2 × 40 = $80.00, and total pay = 22 × 40 = $880.00. With a flat 2 per hour instead of 10%, the figures are identical, since 10% of 20 is 2.

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Common mistakes

  • Choosing the wrong mode. Typing 2 in percent mode means a 2% differential (0.40 per hour on a base of 20), not 2 per hour.
  • Applying the differential to all hours when only some hours qualify, for example a night premium that applies after 10 p.m.; enter only the qualifying hours, or run the tool twice.
  • Entering the differential as a decimal such as 0.10 in percent mode, which is read as 0.10%.
  • Expecting overtime to be included. If the shift also earns overtime, the overtime multiplier applies separately and is not part of this tool.
  • Reading the total as take-home pay. It is gross pay before tax and deductions.

About this calculator

Shift differential pay is extra compensation added on top of a base hourly rate for working less desirable shifts, typically nights, evenings, or weekends. The differential is either a percentage of the base rate or a flat amount per hour, and you can choose which. It's calculated as extra pay = differential per hour × hours worked on that shift (with a percentage, the differential per hour is the base rate × the percentage), then added to the regular pay for those hours to get the total pay for the shift.

HR departments and payroll managers set and apply differential rates to compensate for the disruption of non-standard hours, and the calculation is used heavily in industries that run around the clock — hospitals, manufacturing plants, call centers and hospitality — where night, weekend or holiday shift workers need to see exactly how much extra their schedule earns them over a standard daytime rate.

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