How to Calculate Pro-Rated Salary in Singapore: A Step-by-Step Guide
Calculates salary for an incomplete month, such as when you join or leave mid-month.
In Singapore, payslip maths decides how much you can save, invest and spend, and CPF takes a sizeable share before the money reaches your bank account. Knowing the numbers in advance makes salary negotiations, job switches and budgeting far less of a guess.
What you need
- Monthly salary (S$)
- Days worked
- Working days in the month
Step by step
- Enter the monthly salary (S$).
- 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.
The 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$1,818.18
A second example
Now change the inputs to:
- Monthly salary (S$): 5,000
- Days worked: 12
- Working days in the month: 22
the calculator returns:
- Pro-rated salary: S$2,727.27
- Deduction vs full month: S$2,272.73
Practical tips
- Overtime eligibility depends on your salary and role under Part IV of the Employment Act, not just your job title.
- CPF rates drop in steps after age 55, so check which age band applies from the month after your birthday.
- First- and second-year PRs contribute at graduated rates unless they opt in to full rates, so their figures will be lower.
- Remember the S$8,000 monthly Ordinary Wage ceiling from January 2026: salary above it does not attract CPF.
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.
Payslips must be itemised, showing basic pay, allowances, overtime, deductions and CPF. Comparing a payslip against an independent calculation is the easiest way to catch mistakes, especially in the first month of a new job, after a pay rise, or when you cross an age band.
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.
Related calculations
- Salary Increment Calculator: Shows the new salary after a percentage raise and how much more you earn per year.
- Pro-Rated Annual Leave Calculator: Calculates leave earned for part of a year.
- Salary Converter (Annual, Monthly, Hourly): Converts an annual package into monthly, weekly, daily and hourly figures.
- CPF OA Interest Calculator: Projects your CPF Ordinary Account balance with the 2.5% floor rate and regular contributions.
Want to skip the arithmetic? The free Pro-Rated Salary Calculator does all of this instantly and updates as you type.
Run your own numbers: Pro-Rated Salary Calculator