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Finance Calc Kit
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Prorated Salary Calculator

Calculate prorated salary for partial work periods, mid-month starts, part-time hours, or early departures with step-by-step breakdown.

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How to calculate prorated salary for a partial pay period

Prorated salary is the portion of a full pay period you earn when you work only part of that period. Employers use it for mid-month starts, early departures, unpaid leave, and partial months before benefits kick in. This calculator divides your full-period salary by total working days or hours, then multiplies by the units you actually worked.

If you need to scale an annual salary by weekly hours instead of calendar days, use the pro rata salary calculator. For gross pay before deductions, see the gross pay calculator.

Prorated salary formulas

Unit rate=Full-period salaryTotal days or hours in period\text{Unit rate} = \frac{\text{Full-period salary}}{\text{Total days or hours in period}}
Prorated pay=Unit rate×Days or hours worked\text{Prorated pay} = \text{Unit rate} \times \text{Days or hours worked}

Worked example

A monthly salary of $5,000 covers 22 working days. An employee works 15 days after a mid-month start. Unit rate = $5,000 / 22 = $227.27 per day. Prorated pay = $227.27 x 15 = $3,409.09. The unpaid portion is $1,590.91 (31.8% deducted).

Frequently asked questions

When should I use days vs hours for proration?
Use working days when your employer prorates salaried pay by calendar attendance. Use hours when payroll tracks partial periods by actual time worked, such as hourly-equivalent salaried roles.
Does prorated salary include benefits?
Usually not. This tool calculates gross prorated wages only. Health insurance, retirement match, and bonuses may follow separate employer rules.
What if I work more than the period total?
The calculator caps worked units at the full period total. Overtime or extra days beyond the standard period are typically paid at a different rate.
How is prorated salary different from pro rata pay?
Prorated pay adjusts for a partial calendar period (days or hours in one check). Pro rata pay scales a full-time annual salary by your ongoing weekly hours. Both express a fraction of full pay but answer different questions.
Are prorated amounts pre-tax or after-tax?
Prorated figures here are gross pay before tax withholding. Use a paycheck calculator to estimate net take-home.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.