Calculate shift differential pay from your base hourly rate, hours and a percent or flat premium, with optional overtime, or solve for the premium rate.

Enter eligible non-overtime hours separately from any optional overtime.

Enter 10 for a 10% differential, or 0 for none.

Overtime model
Blank means 0. All entered overtime must share this same base rate and shift premium.

1.5 = time and a half, a common rule but not universal. It multiplies the combined base + differential rate.

Shift Differential Formula

The following formula is used to calculate the total pay including shift differential:

TP = (BP × HW) + (BP × (DR / 100) × HW)

Variables:

  • TP is the included gross pay for the entered eligible hours, before deductions, excluding overtime and other earnings in this formula ($).
  • BP is the base pay rate ($ per hour)
  • HW is the eligible non-overtime hours receiving the same base rate and shift premium.
  • DR is the differential percentage: enter 10 for 10%, and divide it by 100 in the formula.

For percentage premium DR, the added hourly amount is D = BP × DR/100 and included pay is TP = BP × HW × (1 + DR/100). For a flat hourly premium D, use TP = (BP + D) × HW. To back-solve a premium from known pay for these non-overtime hours only, D = (TP − BP × HW)/HW and DR = 100D/BP. To back-solve base rate, BP = TP/[HW × (1 + DR/100)] for percentage, or BP = TP/HW − D for flat. Base rate and eligible regular hours must be positive; premium 0 is allowed, but a blank required premium is not zero. Known pay below base earnings cannot be explained by a nonnegative premium.

How to Calculate Gross Pay for Several Shift Types

Choose Several shift types for a week or pay period with different premiums at the same base hourly rate. Enter any hours paid at the base rate alone, then enter up to four groups of hours and the premium for each group. A percentage premium of P adds base rate × P/100 per hour. A flat premium adds the entered amount per hour.

Gross pay = base rate × base-only hours + the sum of (base rate + hourly premium) × hours for each shift group. Count each hour once. If your employer combines premiums for the same hours, enter their combined hourly amount as one flat premium. This mode estimates straight-time gross earnings before deductions. It excludes overtime adjustments, taxes, and other earnings.

For example, at $25/hour, 20 base-only hours earn $500, 12 night hours with a 10% premium earn $330, and 8 weekend hours with a $4/hour premium earn $232. Gross pay for the 40 hours is $1,062, including $62 in shift premiums.

What is Shift Differential?

Shift differential is additional pay granted to employees who work hours outside the standard workday. Employers may offer shift differential to incentivize workers to cover less desirable shifts, such as night, weekend, or holiday shifts. A shift premium can be a percentage of base hourly pay or a flat amount per eligible hour; actual entitlement and treatment depend on the applicable policy and wage rules.

How to Calculate Total Pay with Shift Differential?

The following steps outline how to calculate the total pay with shift differential:

  1. First, determine the base pay rate (BP) in dollars per hour.
  2. Next, determine only the eligible non-overtime hours (HW) receiving this same base rate and premium.
  3. Next, determine the differential rate (DR) as a percentage.
  4. Use the formula to calculate the total pay (TP) including shift differential.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Base pay rate (BP) = $15.00 per hour

Eligible non-overtime hours (HW) = 40 hours

Differential rate (DR) = 10%. The added rate is $15 × 10/100 = $1.50 per hour. Included gross pay is $15 × 40 × 1.10 = $660, comprising $600 base earnings and $60 shift premium. An equivalent $1.50 flat premium gives the same result. From $660 known pay and 40 eligible hours, the inverse solves return 10% (or $1.50/hour) premium and $15/hour base.

The optional overtime model is available only when solving included pay: TP = (BP + D) × (H + M × O), where H is eligible regular hours, O is separately entered overtime hours, and M is the multiplier on the entire combined hourly rate. Blank O means 0; the editable default M = 1.5 is a model assumption, not a universal entitlement. Every entered overtime hour must receive this same base and premium, and the applicable policy must use this combined-rate model. For BP = $20, D = $2/hour, H = 32, O = 8 and M = 1.5, pay is $22 × (32 + 1.5 × 8) = $968. Its components are $800 straight-time base, $80 shift premium and $88 additional overtime premium.

This estimate does not determine overtime eligibility, legally included compensation, a weighted regular rate, taxes or all pay for a period. Entering hours does not establish that they legally qualify as overtime. U.S. Department of Labor guidance on shift differentials, the regular rate and workweek overtime rules explains why mixed rates, bonuses, exclusions and other facts can require a separate calculation; applicable local law and contracts may add requirements. Amounts display with a $ sign, but the arithmetic is the same in any currency. Money displays two decimals; subcent rates remain unrounded in the calculation, and actual payroll rounding or minor-unit rules can differ.