How to calculate pro-rata leave
A complete guide to calculating leave entitlements for part-time employees in Australia. Learn all three formulas, see worked examples, and understand which entitlements are pro-rated.
Written by
Georgia Morgan
General information only – not legal advice
This guide provides general information about calculating pro-rata leave entitlements for part-time employees in Australia. It does not constitute legal, HR, or professional advice and should not be relied on as a substitute for advice specific to your business, workforce, or circumstances.
What is pro-rata leave?
Pro-rata means "in proportion". For leave entitlements, it means part-time employees and short-tenure staff receive a proportional share of the full-time entitlement based on their hours or time worked. A 0.5 FTE employee (half the full-time hours) receives exactly half the annual leave, personal leave, and long service leave a full-timer earns.
Leave accrual happens progressively throughout the year — not in a lump sum — so pro-rata also applies when an employee hasn't completed a full year. Use annual leave management processes to track balances accurately.
0.5 FTE
= 50% of full-time entitlements
2 weeks
annual leave for a 19 hr/week employee
Hours
always track in hours, not days
Not all leave types are pro-rated. Compassionate leave (2 days per occasion) and community service leave apply in full regardless of hours. See the entitlements table below.
Pro-rata leave formulas
Three methods — use whichever fits your situation. All produce the same result for a standard part-timer.
Formula 1 — hours-based (most common)
Example: (152 hrs ÷ 38 hrs) × 20 hrs = 80 hours annual leave (~2.1 weeks)
Formula 2 — time-based (part-year service)
Example: (6 months ÷ 12) × 4 weeks = 2 weeks annual leave
Formula 3 — FTE shorthand (quickest)
Example: 4 weeks × 0.5 FTE = 2 weeks annual leave
Which leave entitlements are pro-rated?
Most NES leave types are pro-rated for part-time employees. See our full leave entitlements guide for detailed calculations on each type.
| Leave type | Full-time amount | Pro-rata? | Notes |
|---|---|---|---|
| Annual leave | 4 weeks (152 hours / 20 days) | Yes | Based on ordinary hours worked |
| Personal/carer's leave | 10 days (76 hours) | Yes | Accumulates progressively |
| Long service leave | Varies by state (typically 8.67 weeks) | Yes | After qualifying period — see LSL guide |
| Compassionate leave | 2 days per occasion | No | Full entitlement per occasion (hours adjust to shift length) |
| Public holidays | Day off if normally worked | Special rules | Paid if would have worked that day |
Pro-rata leave worked examples
See how the formulas apply across common part-time scenarios.
Annual leave — 0.5 FTE (19 hrs/week)
Hours formula: (152 hrs ÷ 38 hrs) × 19 hrs = 76 hours
FTE shorthand: 4 weeks × 0.5 FTE = 2 weeks
Part-timer working 19 hours/week gets 2 weeks annual leave (76 hours)
Personal/carer's leave — 0.6 FTE (22.8 hrs/week)
Hours formula: (76 hrs ÷ 38 hrs) × 22.8 hrs = 45.6 hours
FTE shorthand: 10 days × 0.6 FTE = 6 days
Part-timer working 22.8 hours/week gets 6 days (45.6 hours)
Annual leave — 0.8 FTE (30.4 hrs/week)
Hours formula: (152 hrs ÷ 38 hrs) × 30.4 hrs = 121.6 hours
FTE shorthand: 4 weeks × 0.8 FTE = 3.2 weeks
Part-timer working 30.4 hours/week gets 3.2 weeks (121.6 hours)
Part-year service — started July 1, leaving December 31
Hours formula: (6 months ÷ 12) × 4 weeks = 2 weeks
FTE shorthand: 0.5 year × 4 weeks = 2 weeks
Full-time employee who worked exactly 6 months of the year
How to calculate pro-rata leave in 6 steps
Follow this process for any part-time employee.
Determine full-time equivalent hours
Identify what constitutes full-time hours for your industry and award.
Tips
- Standard full-time is usually 38 hours per week
- Some awards define full-time as 35 or 40 hours
- Check your specific award for the correct figure
- This is your baseline for all pro-rata calculations
Calculate the employee's ordinary hours
Determine the part-time employee's contracted ordinary hours per week.
Tips
- Use the hours specified in their employment contract
- For variable hours, use the average over a representative period
- Don't include overtime in ordinary hours
- Document the agreed ordinary hours clearly
Calculate the FTE fraction
Divide the employee's hours by full-time hours to get their FTE (Full-Time Equivalent).
Tips
- Formula: Employee hours ÷ Full-time hours = FTE
- Example: 19 hours ÷ 38 hours = 0.5 FTE
- Express as decimal (0.5) or percentage (50%)
- This fraction applies to all pro-rata entitlements
Apply the pro-rata calculation
Multiply the full-time entitlement by the FTE fraction to get the pro-rata entitlement.
Tips
- Annual leave: 4 weeks × FTE = pro-rata weeks
- Personal/carer's leave: 10 days × FTE = pro-rata days
- Can also calculate in hours for precision
- Round up — never down
Convert to hours if needed
For part-timers with variable daily hours, express leave in hours rather than days.
Tips
- A "day" of leave equals their ordinary hours for that day
- Example: 4-hour workday = 4 hours of leave used
- Track balances in hours for accuracy
- Helps when shifts vary in length
Document and track accurately
Maintain accurate records of entitlements, accruals, and usage.
Tips
- Use leave management software for automatic calculations
- Review if hours change (e.g., increased to more hours)
- Provide employees access to their balance
- Recalculate if employment type changes
Common pro-rata leave mistakes to avoid
These errors lead to underpayment, Fair Work complaints, and unhappy employees.
Using the wrong full-time hours baseline
Risk: Miscalculated FTE and incorrect entitlements for all leave types.
Solution: Check your Modern Award — full-time may be 35, 38, or 40 hours depending on your industry.
Rounding down instead of up
Risk: Underpayment — employees are short-changed leave hours.
Solution: Always round up to the nearest half-day or hour. The AI Overview explicitly notes: never round down.
Tracking in days for variable-hour staff
Risk: Inaccurate leave deductions when shifts vary in length.
Solution: Track in hours. A "day" of leave = the hours the employee would have worked that day.
Not recalculating when hours change
Risk: Future accruals are based on outdated hours, creating compliance risk.
Solution: Update the FTE whenever contracted hours are permanently changed.
Applying pro-rata to non-pro-rata entitlements
Risk: Underpaying compassionate leave or mishandling public holiday pay.
Solution: Compassionate leave (2 days per occasion) is not pro-rated by number of days — only by hours in the working day.
Official sources and tools
Use these to verify entitlements and check award-specific rules.
Simplify pro-rata calculations
RosterElf automatically calculates pro-rata leave entitlements for part-time and casual employees. Built for Australian small businesses.
Related guides
More resources for leave calculations and payroll compliance.
Frequently asked questions
- Multiply the full-time leave entitlement by the employee's FTE fraction: Full-time entitlement × (Employee hours ÷ Full-time hours). For example, a part-timer working 20 of 38 full-time hours has an FTE of 0.526, so 4 weeks × 0.526 = 2.1 weeks annual leave. You can also use the Fair Work PACT Leave Calculator at www.fairwork.gov.au/pay-and-wages/pay-calculator for precise figures based on your award.
- The standard formula is: (Full-time leave entitlement ÷ Full-time hours per week) × Employee's ordinary hours per week = Pro-rata entitlement. For part-year service use: (Months employed ÷ 12) × Annual entitlement. Always track the result in hours for variable-hour employees to avoid rounding errors.
- Annual leave is 4 weeks (152 hours for a 38-hour week) for a full-time employee. For a part-timer: (152 hours ÷ 38 hours) × weekly hours = pro-rata hours. Or simply: 4 weeks × (employee hours ÷ 38). Example: 20 hrs/week → 4 × (20/38) = 2.1 weeks, or (152/38) × 20 = 80 hours of annual leave per year.
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