Overtime & Shift Pay Calculator
See what overtime, night, weekend, or other shift differentials add to a paycheck.
01
Start with the employer’s rule
Shift differential is additional compensation for working a schedule or assignment the employer has chosen to pay at a premium. Night shifts, weekends, holidays, undesirable rotations, and specialized duties are common examples. There is no single universal differential: one employer may add $2 per hour, another may add 10%, and another may pay a fixed amount for completing an eligible shift.
The most useful source is the written pay policy, collective-bargaining agreement, offer letter, or earnings-code description on the pay stub. Check the eligible clock hours, whether partial shifts qualify, whether the premium continues during leave, and whether two premiums can be stacked.
02
Flat amount versus percentage
A flat differential is usually straightforward: eligible hours multiplied by the extra hourly amount. A percentage differential is commonly based on the base rate, but the policy may define another rate. A $24 base rate with a $2 night differential adds $16 across eight eligible hours. A 10% differential on that same base adds $19.20.
Do not assume every hour in a pay period qualifies. A worker who crosses from an evening window into a night window may have separate earnings lines. That is why a calculator estimate should be checked against the employer’s exact time windows.
03
The overtime complication
Under federal wage rules, overtime for a covered, nonexempt employee is generally based on the regular rate—not necessarily the label called base pay. The regular rate can include certain forms of compensation, and the Department of Labor describes it as total included compensation divided by total hours worked in the workweek.
This means a simplified estimate that adds a differential after calculating overtime can understate required overtime in some situations. Use the calculator for planning, then compare the result with the employer’s policy and the Department of Labor rules when the precise legal calculation matters.
WORKED EXAMPLE
Put it into practice
Jordan earns $24 per hour and works four 10-hour night shifts. A $2 differential across all 40 hours adds $80 gross for the week. If Jordan also works six overtime hours, the employer may need to consider eligible differential pay when determining the regular rate used for the overtime premium.
ACTION PLAN
What to do next
- Find the differential earning code on a recent pay stub.
- Confirm the eligible hours and whether premiums stack.
- Enter regular, overtime, and differential hours separately.
- Compare the estimate with one completed pay period.
FAQ
Common questions
Is shift differential required by federal law?
Federal law generally does not require a night or weekend premium by itself, though contracts, state rules, or employer policies may require one.
Does a differential increase retirement or benefit calculations?
That depends on the plan’s definition of eligible compensation. Review the plan document rather than assuming every earnings code counts.
SOURCES
Official references
Sources support the rules and definitions discussed. Examples and planning interpretations are produced by Earn Plan Save.
Educational information only. This guide is not financial, tax, legal, or employment advice. Verify important decisions with official documents and an appropriate qualified professional.