Pro-Rated Annual Leave Formula Explained, With Examples
Every pro-rated annual leave result comes from one formula. Once you understand what goes into it, you can sanity-check any figure you are given, whether by an employer, a bank, a teacher or another website.
The formula
Pro-rated leave = (completed months ÷ 12) × full-year entitlement.
What each input means
- Full-year leave entitlement (days): the value you enter in the calculator.
- Completed months of service this year: the value you enter in the calculator.
Example
For example, with these inputs:
- Full-year leave entitlement (days): 14
- Completed months of service this year: 7
the calculator returns:
- Leave earned: 8 days
- Exact pro-rated value: 8.1667 days
How the result changes
The table keeps the other inputs at their example values and changes full-year leave entitlement (days).
| Full-year leave entitlement (days) | Leave earned | Exact pro-rated value |
|---|---|---|
| 14 | 8 days | 8.1667 days |
| 7 | 4 days | 4.0833 days |
| 10.5 | 6 days | 6.125 days |
| 17.5 | 10 days | 10.2083 days |
| 21 | 12.5 days | 12.25 days |
Why it matters
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.
Contribution rates fall as workers get older, to keep older workers employable while their retirement savings continue to grow. The Government has been raising rates for workers above 55 in stages since 2022, with the latest change in January 2026 and another planned for 2027, so figures for senior workers change more often than for younger employees.
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.
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.
Related calculations
- Monthly to Hourly Rate Calculator: Converts a monthly salary into the hourly rate MOM uses for overtime and deductions.
- Daily Rate of Pay Calculator: Finds the daily rate of pay used for public holiday work, rest days and unpaid leave deductions.
- Pro-Rated Salary Calculator: Calculates salary for an incomplete month, such as when you join or leave mid-month.
- Salary Increment Calculator: Shows the new salary after a percentage raise and how much more you earn per year.
Use the Pro-Rated Annual Leave Calculator to plug in your own numbers.
Run your own numbers: Pro-Rated Annual Leave Calculator