Shift Differential Pay Calculator
Calculate total pay when a portion of the week is worked at a shift differential rate, with both percentage-based and flat-dollar differential types.
Common ranges vary by employer and contract. Use your employer's published differential rather than a rule of thumb.
Shift differential is not federally mandated; the rate comes from employer policy or contract. Per 29 CFR 778.207(b), differentials are included in the regular rate for FLSA overtime purposes, so if this week also crosses 40 hours of work, use the overtime calculator against the differential-inclusive rate.
About this tool
Shift differentials are extra pay for hours worked on a shift the employer considers less desirable, typically nights, weekends, or holidays. Unlike overtime, shift differential is not a federal requirement. It is set by employer policy, collective bargaining agreement, or individual contract. What federal law does say is that shift differentials are part of the regular rate for overtime calculation under FLSA per 29 CFR 778.207(b), so getting the differential math right matters for the overtime math too.
This calculator handles the two structures named in 778.207(b): a percentage of the base rate and a flat-dollar amount per hour. You split the hours worked into regular hours at the base rate and differential hours at the premium rate. The result shows the computed premium rate, regular pay, premium pay, and total.
For complex cases with multiple differential tiers (night plus weekend plus holiday overlay) run the calculator multiple times and sum the outputs. For cases where the differential shift also triggers overtime, see the overtime calculator, which handles the FLSA weekly-and-daily rules separately; the overtime premium applies to the differential-inclusive rate, not the base.
How it works
Percent differential: the premium rate is base × (1 + differential_pct / 100).
Flat-dollar differential: the premium rate is base + differential_dollar.
Total pay equals regular_hours × base + differential_hours × premium_rate.
Shift differential is not governed by a single federal statute. What the FLSA does say in 29 CFR 778.207(b) is: "The Act requires the inclusion in the regular rate of such extra premiums as nightshift differentials (whether they take the form of a percent of the base rate or an addition of so many cents per hour) and premiums paid for hazardous, arduous or dirty work." If an employee works overtime during a differential shift, the 1.5x premium applies to the differential-inclusive rate, not the base. This calculator does not combine the two; use the overtime calculator for that leg and run its math against the premium rate this tool outputs.
Examples
A percentage differential of 10% turns a $20 base into a $22 premium rate. Regular and premium hours split evenly in this example, so the differential adds $40 on top of straight-time pay for those 20 hours.
A flat $3/hr weekend premium, common in union contracts and healthcare settings. Four weekday 8-hour shifts at base plus one 8-hour weekend shift at the premium rate.
A 15% night differential on a week that also crosses 40 total hours. The overtime interaction is not modeled here; real payroll would apply FLSA weekly overtime at 1.5× the differential-inclusive rate to the hours over 40. Run the output through the overtime calculator to complete that math.
When to use
Use this to verify a paycheck that includes a shift differential, to project pay when bidding a schedule with night or weekend shifts, or to sanity-check a collective bargaining proposal that changes the differential rate. For weeks that include both overtime and differential, combine this tool with the overtime calculator by first computing the differential-inclusive regular rate, then running the overtime math against that rate. For holiday pay at separate rates, run this calculator once per rate tier.
Related concepts
- 29 CFR 778.207(b) : Nonovertime premiums, including shift differentials, are part of the regular rate
- 29 CFR 778.108 : Definition of the "regular rate" for FLSA overtime
Frequently asked questions
Is shift differential legally required?
No federal law requires shift differential. It is entirely a matter of employer policy or contract. Some collective bargaining agreements mandate it; most non-union employment does not.
Does the differential count toward overtime?
Yes. Under 29 CFR 778.207(b), shift differentials in both percent and flat-dollar form are part of the regular rate. When an employee works overtime, the 1.5x premium applies to the differential-inclusive rate. This calculator does not combine the two; use the overtime tool alongside.
Can an employer eliminate a shift differential?
Generally yes for at-will employment, going forward. A union contract or explicit employment agreement may restrict changes. Consult counsel for a specific situation.
What's a typical differential size?
It varies by industry and contract. This tool deliberately does not publish a rule-of-thumb range because that would imply more precision than employer-specific policy actually has. Use your employer's published differential, your CBA rate, or a quoted contract rate; ask HR for the specific figure if it is not on your pay stub.
Sources
- 29 CFR 778.207(b) (Nonovertime premiums, FLSA regular rate doctrine)
(primary, accessed Apr 15, 2026)
Verbatim text: 'The Act requires the inclusion in the regular rate of such extra premiums as nightshift differentials (whether they take the form of a percent of the base rate or an addition of so many cents per hour) and premiums paid for hazardous, arduous or dirty work.' Both forms this tool computes are named explicitly.
- 29 CFR Part 778 (FLSA Overtime Compensation)
(primary, accessed Apr 15, 2026)
Parent part; relevant sections for regular-rate math include 778.108 (definition) and 778.115 (two-or-more-rates).
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