Multiply eligible shift hours by the premium per hour. For a percentage premium, first multiply the base hourly rate by the differential percentage. Add that premium to ordinary gross pay.
Compare a flat premium with a percentage
There is no single rate to assume for every night or weekend shift. Use the amount and eligible hours specified for your scenario. The table compares two hypothetical policies, not market averages or required rates.
Base hourly rate
10% premium per eligible hour
Flat $2 premium per eligible hour
Extra pay for 12 eligible hours: 10% / flat
$20
$2
$2
$24 / $24
$24
$2.40
$2
$28.80 / $24
$30
$3
$2
$36 / $24
When only part of a shift earns the premium
Suppose a shift runs from 18:00 to 02:00, the specified premium window begins at 22:00, and a 30-minute unpaid break falls entirely inside that window. Paid hours are 7.5, while premium-eligible hours are 3.5. At a hypothetical $24 base rate and $2 differential, straight-time earnings are 7.5 × $24 + 3.5 × $2 = $187 before other adjustments. A break before 22:00 would instead leave four premium-eligible hours.
At a $24 base rate with a 12% night differential, the premium is $2.88 per eligible hour. The night-shift rate is therefore $26.88 before other premiums.
Flat-dollar differentials
A flat $2 premium adds $2 for each eligible hour regardless of the base rate. Twenty-four eligible hours add $48 to gross pay.
Mixed weeks
Separate ordinary and differential-eligible hours instead of applying the premium to the whole week. This is especially important when only part of an overnight shift falls inside the premium window.
Include premiums in the regular-rate estimate
This tool models the shift differential in the weighted regular rate. It adds the straight-time earnings for all hours, divides by total hours, and then adds a half-time premium for the entered overtime hours. Other payments and special rules may change the applicable rate.
Separate the premium from the base pay
Suppose you work 40 hours at a $24 base rate and 12 of those hours qualify for a $3 differential. Base earnings are $960; the eligible premium adds $36, giving $996 before other adjustments. The premium is not $3 multiplied by all 40 hours, and it is not another 12 hours of base pay. Enter total hours once, then identify the subset that earns the premium. Use a separate record when different eligible hours have different premiums; one blended input can hide which rule was applied.
Try it with your numbers
Estimate extra pay from night, evening, weekend or other premium hours.
Ten percent of $20 is $2 extra per eligible hour. Twelve eligible hours add $24 in straight-time premium earnings. The percentage applies to the entered base rate.
Is shift differential the same as overtime?
No. A differential applies to eligible shift hours, while overtime is a separate calculation. The tool allows the same hour to qualify for both without counting it twice as time worked.
Does this calculate take-home pay?
No. It estimates gross pay before taxes, benefits and other deductions. It also excludes bonuses and other pay components not entered in the model.
Can premium hours exceed total hours?
Not in this single-premium model. Enter only the subset of total hours receiving the premium. Overlapping premiums at different rates require a separate calculation.
Should I add differential hours to total hours?
No. They are a subset of the total. If you worked 40 hours and 12 qualified for a premium, enter 40 total and 12 eligible.
A shift differential rewards eligible hours on a particular shift. Overtime treatment depends on the applicable hours and pay rules. They can apply to the same period, but adding two percentages to a base wage without checking the regular-rate calculation can give the wrong amount.
First identify differential-eligible hours with the shift-differential calculator. Once you have established the applicable regular rate and overtime hours, use the overtime calculator’s pay breakdown. Its extra-premium figure is already included in total overtime earnings; do not add it twice.