Pro Rata Salary Calculator Australia

How to calculate a pro rata salary

A pro rata salary is the full-time salary scaled to the proportion of full-time work you actually do. The formula is the same whether you are reducing your hours, working fewer days or joining partway through the year:

Pro rata salary = full-time salary × (your proportion of full-time work)

For a part-time role, the proportion is your ordinary hours divided by full-time hours. A 20-hour week against a 38-hour full-time week is 20 ÷ 38 = 0.5263, so a $100,000 full-time salary becomes $52,632. For a part-year contract, divide the months worked by 12. Six months on a $100,000 full-time salary is $50,000.

The calculator also shows the monthly, fortnightly and weekly gross amounts, employer super, estimated take-home pay and pro rata leave. That makes it easier to compare a part-time offer with a full-time one on more than just the headline salary.

Hours, days or months: which basis should you use?

The best basis is the one your employer uses in the contract, because that is the figure that will be applied to your pay. If the contract says “three days per week”, calculating by days avoids arguments about the length of a day. If it says “22.8 hours per week”, use hours.

• Hours per week is the most precise option, especially when your days are different lengths or your roster changes.
• Days per week is convenient for a regular three-day or four-day week. It assumes each day has the same value.
• Months worked is for fixed-term and part-year contracts, such as a six-month parental leave cover role.

Be careful with “full-time equivalent” assumptions. Some employers use 38 hours, some use 37.5 or 40. A salary calculated against 40 hours will be slightly lower than the same salary calculated against 38. Check the baseline in your contract or award before relying on the result.

Leave and entitlements for part-time employees

Part-time employees receive the same minimum entitlements as full-time employees, but on a pro rata basis. Under the National Employment Standards, full-time and part-time employees get four weeks of annual leave based on their ordinary hours, plus10 days of paid personal/carer’s leave per year. A part-time employee working 20 hours a week accrues 80 hours of annual leave and 40 hours of personal leave, because their ordinary week is shorter.

Casual employees are different. They generally do not receive paid annual or personal leave. Instead they are usually paid a casual loading, commonly 25%, which is intended to compensate for the lack of paid leave and other entitlements. A casual role is not simply a pro rata version of a permanent role, so the leave card is hidden when you switch on casual mode.

Public holidays, long service leave, parental leave and redundancy entitlements can also be affected by part-time status. Your award or enterprise agreement may provide more than the NES. Check the applicable document, or use the Fair Work Ombudsman’s leave calculator for a detailed entitlement estimate.

Pro rata salary examples

Gross base salary before tax and employer super. Part-time and part-year patterns can be combined in practice; calculate each proportion separately and multiply them together.

Tax and super on a pro rata salary

A lower gross salary usually means a lower effective tax rate, because Australia’s tax brackets are progressive. The calculator applies the 2026–27 resident rates, the low income tax offset, the 2% Medicare levy and 12% employer super. It assumes no HELP debt, deductions or other income. To add HELP or change residency, use the main Australian salary calculator.

If you are comparing a part-time offer with your current full-time pay, the reverse salary calculatorcan show the gross salary needed to maintain a target take-home amount. If you are paid hourly rather than by salary, thehourly to salary calculator converts your rate into an annual equivalent.