Shift Differential Calculator
Night, evening, weekend and holiday pay with FLSA overtime
A shift differential is extra pay per hour for working evenings, nights, weekends or holidays, either a flat amount such as $2.00 or a percentage of the base rate such as 10%. Multiply it by the hours that earn it and add it to base pay; in a week over 40 hours, overtime is owed at 1.5 times the regular rate including the differential. A $20.00 worker with 32 night hours at 10% in a 48-hour week earns $1,109.33, not the $1,104.00 a base-rate overtime calculation gives.
Last updated October 2026
Method: Differential per hour = flat amount, or base rate × percent. Straight-time pay = base rate × all hours + every differential. Regular rate = straight-time pay ÷ total hours (29 CFR 778.207(b) and 778.115). Overtime premium = 0.5 × regular rate × hours over 40 in the workweek (FLSA).
Included: Evening, night, weekend and holiday differentials in dollars or percent, stacking when one hour earns two differentials, weekly overtime on the regular rate, a comparison with base-rate-only overtime and an annual estimate.
Not included: State daily overtime rules, the hospital 8-and-80 system, federal Title 5 overtime rules, bonuses and taxes. Weekend or holiday premiums of time and a half or more stay in the regular rate, which can exceed the legal minimum.
🌙 Your pay and hours this week
Enter how many of those hours earn each differential. Hours can count in more than one row, for example a Saturday night shift earns both the night and the weekend differential.
🌙 Gross pay for the week
🧾 Pay breakdown
| Item | Hours | Rate | Pay |
|---|---|---|---|
| Base pay, all hours | 48 | $20.00 | $960.00 |
Night differential shift rate $22.00 an hour | 32 | +$2.00 | $64.00 |
| Overtime premium (half time) | 8 | +$10.6667 | $85.33 |
| Total for the week | 48 | $23.1111 | $1,109.33 |
Same pattern every week: about $57,685 a year before tax (52 weeks).
⚖️ Overtime and the regular rate
- 1. Straight-time earnings. Base pay plus every differential: $960.00 + $64.00 = $1,024.00.
- 2. Regular rate. Divide by all hours worked: $1,024.00 ÷ 48 = $21.3333.
- 3. Overtime premium. Half the regular rate for each hour over 40: 0.5 × $21.3333 × 8 = $85.33.
- 4. Same answer, other route. 40 × $21.3333 + 8 × $32.00 = $1,109.33.
Shift differential pay: how night and weekend differentials are calculated
A shift differential calculator turns a pay policy such as "plus $2.00 an hour on nights" into a weekly paycheck figure. The arithmetic for a single shift is easy. The part that trips up workers and payroll departments alike is the overtime: once a differential is paid, federal law folds it into the rate on which overtime is calculated.
What a shift differential is
A differential is a premium for working hours most people would rather not work. Common names are second shift or evening (for example 3 p.m. to 11 p.m.), third shift or night (11 p.m. to 7 a.m.), weekend and holiday pay. The amount is either flat, a fixed number of dollars per hour, or a percentage of the base rate. The Fair Labor Standards Act does not require any of it: the Department of Labor calls extra pay for night work a matter of agreement between employer and employee. Hospitals, warehouses, manufacturers, call centers and security firms use differentials to staff the shifts that are hard to fill.
The shift differential formula
Differential per hour = flat amount, or base rate × percent Straight-time pay = base rate × all hours + differential pay Regular rate = straight-time pay ÷ all hours worked Overtime premium = 0.5 × regular rate × hours over 40 Weekly pay = straight-time pay + overtime premium The straight-time pay already includes one full rate for every hour, overtime hours included, so the overtime adds only the extra half. That is the same as paying 40 hours at the regular rate plus the overtime hours at 1.5 times it.
Worked example: three 12-hour night shifts
A nurse earns a $38.00 base rate, a $4.00 night differential and a $2.50 weekend differential. This week she works three 12-hour night shifts, one of them on a Saturday, for 36 hours.
- Base pay: 36 × $38.00 = $1,368.00.
- Night differential: 36 × $4.00 = $144.00.
- Weekend differential: 12 × $2.50 = $30.00, stacked on the Saturday night hours.
- Weekly pay: $1,542.00, an average of $42.83 an hour, about $80,184 a year if every week looks the same.
At 36 hours there is no overtime, but the regular rate is already set: $1,542 ÷ 36 = $42.8333. If she picks up a fourth night, that is the kind of rate the overtime premium is built on.
Worked example: a 48-hour week with overtime
These are the calculator's defaults. A warehouse worker earns $20.00 an hour with a 10% night differential and works 48 hours, 32 of them on nights.
- Straight-time pay: 48 × $20.00 + 32 × $2.00 = $960 + $64 = $1,024.00.
- Regular rate: $1,024 ÷ 48 = $21.3333.
- Overtime premium: 0.5 × $21.3333 × 8 = $85.33.
- Weekly pay: $1,109.33, or 40 × $21.3333 + 8 × $32.00.
Paying overtime on the base rate alone gives a premium of $80.00 and a total of $1,104.00, which is $5.33 short. The nurse from the first example shows how fast the gap grows: a fourth 12-hour night makes 48 hours, straight-time pay of $2,046.00, a regular rate of $42.625 and an overtime premium of $170.50, against $152.00 on the base rate, a shortfall of $18.50 in one week.
Why the differential belongs in the overtime rate
The FLSA requires overtime at one and a half times the regular rate, not the base rate. The Department of Labor defines the regular rate as all pay for the workweek, minus a short list of statutory exclusions, divided by the hours actually worked. Shift differentials are not on that list: 29 CFR 778.207(b) says night shift differentials must be included "whether they take the form of a percent of the base rate or an addition of so many cents per hour." With hours at different rates, 29 CFR 778.115 makes the regular rate the weighted average, which is what the calculator computes. The one alternative, under 29 CFR 778.419, is an agreement made before the work to pay overtime at 1.5 times the rate of the job done during the overtime hours.
Weekend and holiday premiums: the time-and-a-half exception
The FLSA does not require extra pay for Saturdays, Sundays or holidays, unless the hours are overtime. When an employer does pay a premium for those days, 29 CFR 778.203 draws a line at time and a half. A premium of at least 1.5 times the normal rate for the same work may be left out of the regular rate and credited toward the overtime owed. A smaller premium, such as $1.50 an hour for weekends, must be included and cannot be credited. The calculator keeps every premium in the regular rate and flags any weekend or holiday premium of 1.5 times base or more, where the legal minimum can be lower than shown.
Hourly pay at common differentials
The shift rate for typical base rates and differentials, plus a 40-hour night week at 10%:
| Base rate | +$1.00 | +$2.00 | +$3.00 | +10% | +15% | 40 h at +10% |
|---|---|---|---|---|---|---|
| $15.00 | $16.00 | $17.00 | $18.00 | $16.50 | $17.25 | $660.00 |
| $18.00 | $19.00 | $20.00 | $21.00 | $19.80 | $20.70 | $792.00 |
| $20.00 | $21.00 | $22.00 | $23.00 | $22.00 | $23.00 | $880.00 |
| $25.00 | $26.00 | $27.00 | $28.00 | $27.50 | $28.75 | $1,100.00 |
| $30.00 | $31.00 | $32.00 | $33.00 | $33.00 | $34.50 | $1,320.00 |
| $35.00 | $36.00 | $37.00 | $38.00 | $38.50 | $40.25 | $1,540.00 |
| $40.00 | $41.00 | $42.00 | $43.00 | $44.00 | $46.00 | $1,760.00 |
| $50.00 | $51.00 | $52.00 | $53.00 | $55.00 | $57.50 | $2,200.00 |
Overtime on a 50-hour night week: correct versus base-only
Every hour of a 50-hour week worked on nights, computed with the calculator's code. The shortfall column is what a payroll system loses by calculating overtime on the base rate:
| Base + differential | Regular rate | Overtime premium | Base-only premium | Shortfall | Correct weekly pay |
|---|---|---|---|---|---|
| $18.00 + $1.50 | $19.50 | $97.50 | $90.00 | $7.50 | $1,072.50 |
| $20.00 + $2.00 | $22.00 | $110.00 | $100.00 | $10.00 | $1,210.00 |
| $22.00 + 10% | $24.20 | $121.00 | $110.00 | $11.00 | $1,331.00 |
| $28.00 + $3.00 | $31.00 | $155.00 | $140.00 | $15.00 | $1,705.00 |
| $35.00 + 15% | $40.25 | $201.25 | $175.00 | $26.25 | $2,213.75 |
| $42.00 + $5.00 | $47.00 | $235.00 | $210.00 | $25.00 | $2,585.00 |
When every hour carries the same differential, the regular rate is simply the shift rate, and the shortfall is half the differential times the 10 overtime hours, so it grows with both.
Flat dollars or a percentage?
A 10% differential and a $2.00 differential are worth exactly the same at a $20.00 base rate. Below $20.00 the flat amount pays more; above it the percentage pays more, and at $30.00 the 10% is worth $3.00 an hour. A percentage also rises with every raise, while a flat amount stays put until the policy changes. If you are offered a choice, compare both at your expected rate two or three years out.
Night differential for federal employees
Federal premiums are set by law. According to OPM, General Schedule employees get night pay of 10% of their rate of basic pay, including locality pay, for regularly scheduled work between 6 p.m. and 6 a.m., a 25% Sunday premium for regularly scheduled Sunday work, and holiday premium pay equal to their basic rate. Federal Wage System employees get a 7.5% differential when most of a shift falls between 3 p.m. and midnight and 10% when most falls between 11 p.m. and 8 a.m., paid for the entire shift. Using the percent setting, a GS employee with a $30.00 basic rate, 40 night hours and 8 Sunday hours earns $120 in night pay plus $60 in Sunday premium, $1,380.00 for the week. Federal Title 5 overtime follows its own rules, so treat the overtime part here as private-sector FLSA math.
How to use this calculator
- Enter your base hourly rate and the total hours worked in the workweek.
- For each shift type, enter the hours that earn it, the amount, and whether it is dollars per hour or a percent of base.
- Enter the same hours in two rows when your employer stacks differentials, such as weekend nights.
- Read the weekly pay, the regular rate, the overtime premium and the base-only comparison.
Who this calculator is for
Nurses, aides and hospital staff on nights and weekends; warehouse, manufacturing and logistics workers on second or third shift; security officers, call center agents and transit workers; and supervisors or payroll staff who want to check that differentials and overtime are applied the way the FLSA requires.
Key terms
- Base rate: the hourly wage before any differential.
- Shift rate: base rate plus the differential for that shift.
- Regular rate: all straight-time pay for the workweek divided by all hours worked; the basis for overtime.
- Overtime premium: the extra half of the regular rate for each hour over 40.
- Workweek: a fixed, recurring period of 168 hours (seven consecutive 24-hour days) in which overtime is measured.
- Stacking: paying two differentials for the same hour.
What changes your pay, and tips
- The share of hours on the differential: 32 of 48 night hours gives a regular rate of $21.33, all 48 gives $22.00.
- Overtime hours: each hour over 40 adds half the regular rate, so the differential is paid at 1.5 times in effect.
- Check your pay stub: if the overtime rate is exactly 1.5 times your base rate in a week with differentials, ask payroll how the regular rate was figured.
- Get the policy in writing: which hours qualify, whether differentials stack, and whether PTO is paid at the shift rate are all employer choices.
Limitations
The calculator applies the federal 40-hour weekly standard only. State laws can add daily overtime or other rules. Hospitals and residential care facilities may use a 14-day period with overtime after 8 hours in a day and 80 hours in the period by agreement made before the work (29 CFR 778.601), which this tool does not model. Exempt salaried employees are not owed FLSA overtime, and per-shift lump sums need to be converted to an hourly amount before you enter them.
Related calculators
- For plain time-and-a-half and double-time pay, use the Overtime Calculator.
- To total the hours first, use the Timesheet Calculator.
- To turn a shift rate into an annual figure, use the Hourly to Salary Calculator or the Salary to Hourly Calculator.
- For the employer's view, see the Employee Cost Calculator and the Payroll Tax Calculator; to value paid leave, use the PTO Calculator.
Sources
- Electronic Code of Federal Regulations: 29 CFR Part 778, sections 778.104, 778.105, 778.115, 778.203, 778.207, 778.419 and 778.601.
- U.S. Department of Labor: Fact Sheet #56A, Overview of the Regular Rate of Pay; Night Work; Overtime Pay.
- U.S. Office of Personnel Management: Night Pay for General Schedule Employees; Premium Pay (Title 5); Night Shift Differential for Federal Wage System Employees.
⚠️ Common mistakes & edge cases
Paying overtime on the base rate
Leaving the differential out of the regular rate underpays every overtime hour by half the average differential: $5.33 in the 48-hour default week and $18.50 in the nurse's 48-hour week.
Assuming overtime is 1.5 times the night rate
When a week mixes day and night hours, the regular rate is the weighted average, $21.33 in the default example, not the $22.00 night rate. Paying the shift rate during overtime needs an agreement made before the work.
Applying the percentage to the wrong number
A percentage differential is figured on the base rate, not on the overtime rate or on a rate that already includes another differential, unless the policy says otherwise.
Forgetting stacked hours
A Saturday night shift can earn both the night and the weekend differential. Entering the 12 hours only once leaves $30.00 out of the nurse's week.
Dropping per-shift premiums from the regular rate
A flat bonus per night shift is still pay for the hours worked and goes into the regular rate. Divide it by the shift length and enter it as dollars per hour.
Treating a weekend premium below time and a half as creditable
Only premiums of at least 1.5 times the normal rate may be excluded from the regular rate and credited toward overtime. A $1.50 weekend differential is ordinary pay for overtime purposes.
❓ Frequently asked questions
How do I calculate shift differential pay?
Multiply the differential by the hours that earn it and add the result to base pay. A percentage is applied to the base rate first, so 10% of $20.00 is $2.00 an hour, and 32 night hours earn $64 on top of base pay for all hours. In a week over 40 hours, overtime is then figured on the regular rate that includes the differential.
Is shift differential included in overtime pay?
Yes, for nonexempt workers covered by the FLSA. 29 CFR 778.207(b) requires night shift differentials to be included in the regular rate, whether they are a percentage or a fixed amount per hour, and overtime is owed at 1.5 times that regular rate, not 1.5 times the base rate.
How is overtime calculated with a night differential?
Add base pay for all hours and all differential pay, divide by total hours to get the regular rate, then add half the regular rate for each hour over 40. For $20.00 an hour, 48 hours and 32 night hours at $2.00: $1,024 divided by 48 is $21.3333, the premium is $85.33 and the week pays $1,109.33.
Is a shift differential required by law?
Not under federal law. The Department of Labor says the FLSA does not require extra pay for night work, or for weekends and holidays unless the hours are overtime. Differentials come from employer policy or a union contract, but once paid they must be counted in the regular rate.
What is the night differential for federal employees?
General Schedule employees get night pay of 10% of basic pay, including locality pay, for regularly scheduled work between 6 p.m. and 6 a.m., plus a 25% Sunday premium and holiday premium pay equal to their basic rate. Federal Wage System employees get 7.5% or 10% for the whole shift, depending on when most of its hours fall.
Is a 10% differential better than $2 an hour?
At a $20.00 base they are identical. Below $20.00 the flat $2.00 pays more; above it the 10% pays more, so at $30.00 the percentage is worth $3.00 an hour. A percentage also grows with every raise, while a flat amount stays the same until the policy changes.
Do weekend and holiday premiums count toward overtime?
Usually yes, like any differential. The exception under 29 CFR 778.203 is a premium for Saturdays, Sundays, holidays or regular days of rest of at least time and a half: the employer may leave it out of the regular rate and credit it toward overtime. A $1.50 weekend differential must be included.
Is shift differential taxed differently?
No. It is part of your regular wages, so federal income tax, Social Security and Medicare are withheld on it like base pay. A large differential can raise the withholding on that paycheck, but your actual tax depends on total income for the year.
Do night and weekend differentials stack?
Only if the employer's policy says so, but many pay both when an hour qualifies twice, such as a Saturday night. Enter the same hours in both rows to model it: a $4.00 night and a $2.50 weekend differential make $6.50 an hour above base, and both belong in the regular rate.
💡 Good to know
Optional to pay, mandatory to count
No federal law requires a night differential, but once an employer pays one, it must be part of the regular rate for any week over 40 hours. That is the single rule this calculator is built around.
The workweek is fixed, not the pay period
Overtime is measured in each fixed 7-day workweek (29 CFR 778.104). A 36-hour week and a 44-hour week cannot be averaged into an 80-hour biweekly period to avoid overtime, except under the hospital 8-and-80 agreement.
Small differentials add up over a year
A $2.00 night differential on 32 hours a week is $64 a week, or $3,328 over 52 weeks, before any overtime effect. Over a career on nights that is a meaningful share of income.
Related Calculators
Overtime Calculator
Calculate overtime pay at time-and-a-half
Timesheet Calculator
Total weekly work hours and pay from a timesheet
Hourly to Salary Calculator
Convert an hourly wage to annual salary and back
Salary to Hourly Calculator
Convert an annual salary to an hourly, weekly and monthly rate
Employee Cost Calculator
True cost of an employee including payroll taxes
PTO Calculator
PTO accrual per pay period and payout value