How the Prorated Salary Calculator works
This tool answers the partial-period pay question: if an employee only works part of a pay period — because they started, left, or took unpaid leave mid-period — how much of the normal salary should they receive? It uses the working-day proration method, the standard approach most payroll systems use to prorate salaried pay.
The formula
First, the annual salary is converted into a full-period salary using the number of pay periods per year (52 for weekly, 26 for bi-weekly, 24 for semi-monthly, 12 for monthly). That full-period salary is then divided by the working days in the period to get a daily rate, and the daily rate is multiplied by the days actually worked:
Prorated Pay = (Annual Salary ÷ Pay Periods per Year) ÷ Working Days in Period × Days Worked
The calculator assumes the daily rate is constant across the period and that "working days" means scheduled work days (typically Monday–Friday), not calendar days including weekends.
Worked example
Take a $60,000 annual salary paid monthly, in a month with 22 working days, where the employee worked only 10 of them (for example, they started mid-month). The full monthly salary is $60,000 ÷ 12 = $5,000. The daily rate is $5,000 ÷ 22 ≈ $227.27. Prorated pay for 10 days worked is 10 × $227.27 ≈ $2,272.73, which is 45.5% of the full monthly salary.
Working days vs. calendar days
This calculator uses the working-day method because it ties pay to the days an employee was actually scheduled to work, so weekends and holidays outside the schedule don't distort the daily rate. Some employers instead use a calendar-day method — full period salary ÷ total calendar days in the period × calendar days employed — which produces a slightly different number because it counts every day, weekend or not, the same as a workday. Check your employer's payroll policy to confirm which convention applies to your paycheck.
What moves the result
- Days worked: the direct driver — each additional working day adds one daily rate to the total.
- Working days in the period: a shorter month (fewer scheduled workdays) produces a higher daily rate for the same salary, so the same number of days worked yields more pay in a short period than a long one.
- Pay frequency: switching between weekly, bi-weekly, semi-monthly, and monthly changes the full-period salary used as the starting point, since each frequency splits the annual salary differently.