Shift Differential and Night Pay Calculator

What a shift differential is

A shift differential is extra pay per hour for working undesirable hours - nights, evenings, weekends or holidays. It is set by your employer, union contract or policy, so check yours. The window and amount are therefore inputs here, pre-filled with an example (10:00 pm to 6:00 am), not rules.

The calculator counts only the minutes of your shift that overlap the window, even when the window or the shift crosses midnight. Hours outside the window earn the base rate. The unpaid break is taken from the hours outside the window first, which is the assumption most favorable to the employee; if your policy treats the break differently the number will vary slightly.

Worked example

Percent vs flat differentials

A 10% differential on a $20 base is $2.00 an hour, the same as a flat $2. They diverge when your base rate changes: after a raise to $25 the percent version becomes $2.50 while the flat version stays $2. The calculator accepts either.

For overtime, the Department of Labor says the regular rate includes all remuneration for employment except the payments the law specifically lets employers exclude; shift differentials are not among the exclusions in the DOL's list. That is why the weekly figure above uses a blended regular rate. Your employer's payroll should do the same.

Related checks

• Check how many hours a night shift is with the hours calculator.
• Compare overtime rules in your state with the overtime calculator.
• Estimate your net pay with the paycheck estimator.

Common ways differentials are structured

• Flat amount per hour for hours in a window (the example above): $2.00 for each hour between 10 pm and 6 am.
• Percentage of base pay: 10% on evenings, 15% on nights.
• Whole-shift differential: if most of the shift falls in the window the whole shift gets the premium. This calculator counts only the hours inside the window; for a whole-shift rule, set the window to cover the whole shift.
• Weekend or holiday premium: handled the same way by changing the window.

Because these vary by employer and contract, read your offer letter or policy and enter the numbers it states.

Estimating the yearly value

Checking your pay stub for differentials

A correct stub shows the differential either as a separate earnings line (“night differential”, hours and rate) or as a blended rate. Compare the hours on that line with the hours your shift spent in the window. If you worked 9:00 pm to 5:30 am with a 10:00 pm start for the differential, the shift has 7.5 hours in the window (before any break), not the full 8.5 hours.