How to use this calculator
Add a night, weekend or special-shift percentage to base pay. Enter your values into the fields above. Your result and individual components update immediately without leaving this page.
The formula
Base pay = hourly rate × eligible hours. Differential = base pay × premium percentage ÷ 100. Total eligible-shift earnings = base pay + differential.
Worked example
Eight eligible hours at $21/h produce $168 base pay. A 12% differential adds $20.16, for $188.16 total.
Frequently asked questions
Is a shift differential overtime?
Not necessarily. Shift premiums and overtime are different concepts, and the way they interact depends on your pay rules.
Can I enter a fixed dollar bonus?
This version calculates percentage-based differentials. For a fixed bonus, multiply the extra dollars per hour by eligible hours separately.
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Important: This calculator provides arithmetic estimates, not employment, tax or legal advice. Check local rules and your own agreement before relying on a payroll figure.