Shift Differential Calculator
Premium rate = base rate + differential (or base × (1 + percent)). Total pay = regular hours × base rate + shift hours × premium rate. $20 with a $2 night differential: 30 regular + 10 night hours pays $820.
How to use this shift differential calculator
- Enter your base hourly rate.
- Choose how the differential is paid: a flat amount per hour (for example $2) or a percentage of your base rate (for example 10%).
- Enter the hours you work at the base rate and the hours you work on the premium shift, such as nights or weekends.
- If you work more than the weekly overtime limit, the calculator adds overtime based on your blended rate. You can change the threshold and multiplier.
How do you calculate shift differential pay?
For a flat differential: premium rate = base rate + differential. At $20 an hour with a $2 night differential, night hours pay $22. For a percentage: premium rate = base rate × (1 + percent ÷ 100). A 10% differential on $20 also gives $22. Total pay = regular hours × base rate + premium hours × premium rate.
Example: 30 regular hours and 10 night hours at $20 with a $2 differential pay 30 × $20 + 10 × $22 = $820, which is $20 more than the same hours without the differential.
Flat or percentage differential?
- Flat amounts are simple to audit and the same for everyone on the shift.
- Percentages stay proportional as base pay rises, so a higher-paid worker gets a bigger premium.
- Typical sizes. Many employers pay roughly $1 to $3 an hour or 5% to 15%, but it varies by industry and how hard the shift is to staff.
Differential on a $20 base rate
Extra pay if all 40 hours in a week are on the premium shift:
| Differential | Premium rate | Extra per 40 hours | Extra per year (52 weeks) |
|---|---|---|---|
| $20 | $21.00 | $40.00 | $2,080.00 |
| $20 | $22.00 | $80.00 | $4,160.00 |
| $20 | $23.00 | $120.00 | $6,240.00 |
| $20 + 5% | $21.00 | $40.00 | $2,080.00 |
| $20 + 10% | $22.00 | $80.00 | $4,160.00 |
| $20 + 15% | $23.00 | $120.00 | $6,240.00 |
How does shift differential affect overtime?
In the US, overtime is based on the regular rate, which includes shift differentials. If you work 30 regular hours at $20 and 20 night hours at $22 (50 hours), your blended rate is ($600 + $440) ÷ 50 = $20.80. The 10 overtime hours get an extra half-time premium on that blended rate: 0.5 × $20.80 × 10 = $104, so the week pays $1,040 + $104 = $1,144. Using only the base rate would understate overtime. The calculator does this automatically when your total hours pass the weekly threshold.
Is a shift differential the same as overtime or holiday pay?
No. A differential pays extra for the time of day or day of week. Overtime pays extra for hours beyond a weekly limit. Holiday pay and weekend premiums may be separate additions that can stack with a differential under your employer's policy or contract.
Do employers have to pay a shift differential?
Federal law does not require it. It is a benefit set by the employer, a union contract or a state or local rule, so it depends on your workplace. Ask your employer or check your offer letter or handbook.
Is a shift differential taxed?
Yes. It is part of your wages and is taxed like regular pay. The calculator shows gross pay before tax.
What your employer may do differently
Policies vary more than the maths does. Some employers pay the premium only for hours after a set time, such as after 7 p.m., so a shift that starts in the afternoon earns it for only part of the night. A night shift on a weekend may carry two premiums that add together, or only the larger one. Union contracts often spell this out. On a pay stub, check two things: that the premium was paid only on the qualifying hours, and that overtime was calculated on the blended rate, not the base rate.
Shift Differential Calculator FAQ
How do you calculate shift differential pay?
Add the differential to your base rate for the hours on that shift, or multiply the base rate by 1 plus the percentage. Then multiply by the shift hours and add your regular hours.
What is a typical shift differential?
Many employers pay about $1 to $3 more per hour or 5% to 15% more, but it varies widely by industry and employer.
Is a shift differential the same as overtime?
No. A differential pays extra for the time of day or day of week. Overtime pays extra for hours beyond a weekly limit.
Does shift differential count toward overtime?
In the US it is generally part of the regular rate used to calculate overtime, so overtime on those hours can be higher than on the base rate.
Do employers have to pay a shift differential?
Federal law does not require it. It is an employer or contract benefit, so check your policy.
Are shift differentials taxed?
Yes. They are part of your wages and are taxed like regular pay.
Should a differential be a flat amount or a percentage?
A flat amount is simple to audit. A percentage stays proportional as base pay rises. Both are common.
What if I work two premium shifts at once?
It depends on the employer. Premiums may add together or the larger may apply. Check your policy or contract.
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Last updated: November 11, 2026 · How we check this calculator