Night Differential Calculator
Updated August 2026 · Free · No sign-up
Calculate night differential pay — percentage or flat-rate premiums for night hours — including the federal GS 10% night differential rules, per-shift and annual earnings, and how nights stack with overtime.
Quick answer: Night differential = base rate × premium % (or + flat amount) × night hours. A $30/hour nurse with a 12% night differential earns $33.60/hour — $268.80 per 8-hour night and about $7,500 extra per year full-time. Federal GS employees get a statutory 10% for regularly scheduled work between 6 PM and 6 AM.
How Night Differential Works
Night differential compensates the hours society least wants to work — typically a percentage premium (5-15%) or a flat hourly add ($1-$8) applied only to hours inside the employer's defined night window. No US federal law requires it for private workers — it's policy, union contract, or (for federal employees) statute. The window definition decides real money: an evening shift ending 11 PM may earn nothing under a "10 PM-6 AM" window, everything under a "6 PM-6 AM" one.
Worked Examples
Example 1 — hospital nights. $30 base, 12% differential, 8-hour nights: $33.60/hour → $268.80/shift; five nights weekly ≈ $7,488/year above day-shift pay.
Example 2 — flat rate warehouse. $19 base + $1.75 nights, 10-hour shifts with 8 hours in-window: 8 × $1.75 = $14/shift extra — the flat structure pays the same regardless of your base, proportionally better for junior staff.
Example 3 — federal GS. A GS employee regularly scheduled 10 PM-6 AM: statutory 10% on those hours — and, unusually, GS night differential continues during paid leave for regularly scheduled night work. Wage-grade (FWS) federal workers instead get 7.5% (2nd shift) or 10% (3rd shift) on the whole shift.
Typical Night Differentials
| Sector | Typical premium | Common window |
|---|---|---|
| Healthcare (nursing) | 10-15% or $3-$8/hr | 7 PM-7 AM or 11 PM-7 AM |
| Manufacturing 3rd shift | 10-15% or $1-$3/hr | 10 PM-6 AM |
| Warehouse/logistics | $1-$2.50/hr flat | 6 PM/10 PM starts |
| Federal GS | 10% statutory | 6 PM-6 AM (majority-of-hours rules) |
| Federal wage grade (FWS) | 7.5% / 10% whole-shift | 2nd / 3rd shift |
| Philippines (BPO — law) | 10% minimum statutory | 10 PM-6 AM |
Nights + Overtime: The Stacking Rule
Under the FLSA, overtime is 1.5× the regular rate including the night differential — never base pay alone. The $30/12% nurse working overtime on nights earns 1.5 × $33.60 = $50.40/hour, not $45. Systems that compute OT on base rate systematically underpay night crews — the most common wage error in 24/7 operations. Check any suspicious stub against the overtime calculator using your differential-inclusive rate, and the broader premium landscape in the shift differential calculator.
Federal Rules Worth Knowing Precisely
- GS (5 CFR 550.121): 10% of basic pay for regularly scheduled work between 6 PM and 6 AM; if a majority of a regularly scheduled shift's hours fall in the window, the differential covers the qualifying hours. Irregular/occasional night work doesn't qualify — scheduling is everything.
- Leave continuation: GS night differential continues during paid leave when night work is part of the regular schedule — rare generosity worth confirming with HR.
- FWS: 7.5% for shifts with majority hours 3 PM-midnight; 10% for majority hours 11 PM-8 AM — applied to the entire shift, not just window hours.
- Not taxable-special: all differentials are ordinary wages — normal withholding applies.
Valuing a Night Job Honestly
Annualize before deciding: this calculator's projection line shows the differential's yearly value — set it against sleep disruption (the research on chronic night work and health is serious), family logistics, and the exit problem (differentials vanish when you move to days; they never compound into base like a raise). Negotiation notes: quote sector norms from the table; ask whether PTO is paid at the differential rate for permanent night staff (unions win this; individuals rarely ask); and get the window definition in writing — "nights" without hours is a dispute pending.
Frequently Asked Questions
How is night differential calculated?
Base rate × premium percentage (or + flat amount) × the hours falling inside the employer's night window. $30 with a 12% differential pays $33.60 for each night hour.
What is a typical night shift differential?
5-15% of base pay or $1-$8/hour flat — healthcare highest (10-15%), manufacturing third shifts 10-15%, warehousing commonly $1-$2.50 flat.
Is night differential required by law?
Not for US private employers — it is policy or union contract. Federal GS employees have a statutory 10%; the Philippines mandates 10% for night work nationally.
What is the federal GS night differential?
10% of basic pay for regularly scheduled work between 6 PM and 6 AM (5 CFR 550.121) — and it continues during paid leave for regular night schedules. FWS shifts pay 7.5%/10% whole-shift.
Does night differential count toward overtime?
Yes — FLSA overtime uses the regular rate including differentials: 1.5 × your night rate, not 1.5 × base. OT computed on base pay alone underpays night workers.
How much is night differential worth per year?
A 12% differential on $30/hour, five nights weekly, is roughly $7,500/year. Enter your shifts above for the projection.
What hours count as night shift?
Whatever window the policy defines — commonly 10 PM-6 AM or 11 PM-7 AM (6 PM-6 AM federal). Only in-window hours earn percentage differentials; some schemes pay whole-shift once a majority qualifies.
Is night differential paid on PTO or holidays?
Usually only if policy or contract says so — federal GS regular night schedules are the notable yes. Holiday-plus-night stacking follows your holiday premium rules.
Is night differential taxed differently?
No — ordinary wages, ordinary withholding.
Can I negotiate a night differential?
Yes, especially where staffing nights is hard: cite sector norms (10-15% healthcare), define the window precisely, and ask for PTO at the differential rate if nights are permanent.
✓ Formula verified • Last updated: August 20, 2026