Shift Differential Overtime Calculator
Standard Formula
Base Rate = Hourly Wage + Shift Differential; Overtime Rate = Base Rate × 1.5
Shift differentials must be included in the regular rate before computing the 1.5× overtime rate.
How Shift Differential Overtime Calculator Works?
The Shift Differential Overtime Calculator works by adding the shift differential to the base rate first and then multiplying the total by 1.5.
1Enter the base rate
Type the regular hourly wage, $24.00 by default.
2Enter the differential
Type the extra dollars per hour for the shift, $3.50 by default.
3Enter overtime hours on the shift
Add overtime hours worked on the differential shift.
4Read the overtime rate
($24.00 + $3.50) × 1.5 returns $41.25 per hour, $5.25 more than overtime on the base rate alone.
Shift Differential Overtime Calculator Formula
The Shift Differential Overtime Calculator formula is Overtime Rate = (Base Rate + Shift Differential) × 1.5.
Effective base rate
Effective Rate = Base Rate + Differential
Overtime rate
OT Rate = Effective Rate × 1.5
Differential boost on overtime
Boost = Differential × 1.5
- Base Rate
- Hourly wage without premiums.
- Differential
- Extra $/hr for evening, night, weekend or hazard shifts.
- OT Rate
- Hourly overtime rate on the differential shift.
Worked example: 10% night differential
Base $30.00 with a 10% differential = $3.00. Effective Rate = $33.00.
OT Rate = $33.00 × 1.5 = $49.50 per hour. Without the differential, overtime would be $45.00.
Shift Differential Overtime Calculator Conversion Table
The Shift Differential Overtime Calculator conversion table shows overtime rates at a $24.00 base wage for 7 differential amounts.
| Differential | Effective Base Rate | OT Rate (1.5×) | OT Boost per Hour | 8 OT Hours Pay |
|---|---|---|---|---|
| $0.00 | $24.00 | $36.00 | $0.00 | $288.00 |
| $1.00 | $25.00 | $37.50 | $1.50 | $300.00 |
| $1.50 | $25.50 | $38.25 | $2.25 | $306.00 |
| $2.00 | $26.00 | $39.00 | $3.00 | $312.00 |
| $2.50 | $26.50 | $39.75 | $3.75 | $318.00 |
| $3.50 | $27.50 | $41.25 | $5.25 | $330.00 |
| $5.00 | $29.00 | $43.50 | $7.50 | $348.00 |
What is Shift Differential Overtime Calculator?
A Shift Differential Overtime Calculator is a tool that includes evening, night or weekend differentials in the overtime rate.
Shift differentials are part of the regular rate under 29 CFR § 778.207(b). An employer that pays overtime at 1.5× the base wage only, and ignores the differential, underpays every overtime hour worked on that shift.
A worker who earns a differential on some hours of the week needs a weighted regular rate. The calculator covers the common case where all overtime hours fall on the differential shift.
What are the uses of Shift Differential Overtime Calculator?
There are 4 main uses of the Shift Differential Overtime Calculator.
Night shift paychecks
Healthcare and factory workers confirm overtime that includes the night premium.
Payroll code checks
Administrators verify that differential pay codes feed the regular rate.
Shift bids
Workers compare day overtime with night overtime.
Back pay reviews
Employers quantify past overtime that left out differentials.