Pro-Rated Salary Calculator
Calculates salary for an incomplete month, such as when you join or leave mid-month.
Result
- Pro-rated salary
- S$2,181.82
- Deduction vs full month
- S$1,818.18
How to use the pro-rated salary calculator
- Enter the monthly salary (S$).
- Enter the days worked.
- Enter the working days in the month.
- The results update as you type, or press Calculate.
- Read the pro-rated salary first, then the supporting figures below it.
Formula
Pro-rated salary = monthly salary × days worked ÷ working days in that month.
Worked example
For example, with these inputs:
- Monthly salary (S$): 4,000
- Days worked: 12
- Working days in the month: 22
the calculator returns:
- Pro-rated salary: S$2,181.82
- Deduction vs full month: S$1,818.18
Background
The Employment Act sets out how hourly and daily rates are calculated for overtime, public holiday work and salary deductions. These formulas use the monthly basic rate of pay rather than gross salary, which is why the numbers can look lower than a simple division of your salary by hours worked.
CPF distinguishes between ordinary wages, which are paid for work in the month such as basic salary and fixed allowances, and additional wages, such as annual bonuses and leave encashment. Ordinary wages are capped at S$8,000 a month from January 2026, while additional wages are capped by an annual ceiling of S$102,000 minus the ordinary wages already subject to CPF in the year.
Frequently asked questions
How does the pro-rated salary calculator work?
It applies this formula: Pro-rated salary = monthly salary × days worked ÷ working days in that month.
Are these figures exact?
They follow the published CPF and MOM formulas, but your employer's payroll may round slightly differently or include allowances in a different way. Your payslip is the final reference.