Calculation details
Planning estimate only. Pay, overtime, holidays, and working-time rules vary by employer and jurisdiction.
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Use this result
Share the current inputs or ask ChatGPT to explain the calculation in context.
What does this calculator estimate?
40 hours at $20/hour with a 10 percent night differential pays $800 x 1.10 = $880. Shift premium = base pay x differential percent.
- Shift premium = base pay x differential percent.
- Night and weekend differentials typically run 5-15 percent (Wikipedia).
- Overtime is computed on the base rate, then the differential is added.
How shift differentials work
Employers pay a premium — often 10–15% — for shifts most workers avoid: nights, weekends, and holidays. The calculator applies the differential to regular hours and stacks overtime on top.
Limitations to watch for
Differential policies vary widely: some apply the premium to the whole shift, others only after a certain hour. The tool applies it to regular hours; overtime then uses the base rate multiplier.
How to use it in practice
Enter the differential from your offer or collective agreement. Use the total to compare day vs night schedules and to budget. Confirm whether the premium applies to overtime hours in your workplace.
['Enter hours and the base rate.', 'Enter the differential % and any overtime hours.', 'Read the premium and total pay.']
What a shift differential is
A shift differential is extra pay for working less-desirable hours — nights, weekends, or holidays — added as a percentage of the base rate or as a flat per-hour amount. A 10 percent differential on a $20 base pays $22 for those hours. The calculator models both percentage and flat structures.
How differentials combine with overtime
When differential hours push you over the overtime threshold, the premium applies to the adjusted rate: base $20 plus 10 percent differential is $22, and time-and-a-half on that is $33. Employers differ on whether the differential is included in the overtime rate — federal law generally requires it for nonexempt workers. The calculator models the combined rate explicitly.
Weekend and holiday premiums
Many employers pay a higher differential for Sundays and holidays, sometimes double time. The calculator lets you set different differentials per shift type so a Saturday night shift and a Sunday holiday shift produce different pay for the same hours.
Is a differential worth the trade?
The math is only half the decision: a $2-per-hour differential on a 40-hour week adds $80, about $3,200 a year, but nights also carry health, childcare, and commute costs. The calculator shows the pay difference; the lifestyle cost is a separate calculation.
A worked example
An RN earning $38 base with a $4 night differential works 36 hours: $42 × 36 = $1,512, versus $1,368 at base — a $144 difference for the week. If a 12-hour shift crosses midnight, the hours split between differential rates, which the calculator handles when you enter shift-specific rates.
How this calculator works
Formula
Shift premium = base pay × differential %. Total = (regular hours × rate × (1 + differential)) + overtime hours × rate × overtime multiplier.
Worked example
40 hours at $20/hr with a 10% night differential: $800 × 1.10 = $880.
Assumptions to verify
- The differential applies to regular hours.
- Overtime uses the base rate × multiplier.
- The premium reflects the employer's policy.
Frequently asked questions
What is a shift differential?
Extra pay for working undesirable shifts — typically 10–15% more for nights, weekends, or holidays.
How do I calculate it?
Base pay × differential %: 40 hrs at $20 with 10% = $800 × 1.10 = $880.
Do I get the differential on overtime?
Depends on the policy — many employers pay OT at the base rate multiplier without stacking the differential. Check your agreement.
Who gets shift differentials?
Healthcare, manufacturing, security, and other 24/7 industries commonly pay them.
Is it the same as overtime?
No — overtime is for hours beyond the threshold; a differential is a premium for the shift time itself.
What shifts qualify?
Nights, weekends, and holidays — the exact definition is set by the employer.
How do I compare shifts?
Run both schedules through the calculator — a 10% differential can outweigh a slightly higher base rate elsewhere.
Does the differential count toward overtime?
For nonexempt workers, the premium generally applies to the adjusted rate — the calculator models it.
How much is typical?
Common differentials run 5–15% for nights and higher for Sundays and holidays.
Is a differential worth the night shift?
The pay math is clear; health, childcare, and commute costs are the rest of the decision.
Cite this tool
BoringToolsKit. “Shift Differential Calculator.” boringtoolskit.com/shift-differential-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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