How to Calculate PTO Accrual for Part-Time Employees
The simplest fair method is to accrue PTO per hour worked. Full-timers and part-timers then earn at the same rate, and nobody has to prorate anything by hand.
The formula
Accrual rate = annual PTO hours ÷ annual hours for a full-time employee
For 10 days (80 hours) on a 40-hour week: 80 ÷ 2,080 = 0.0385 hours of PTO per hour worked. Keep at least four decimals so rounding doesn't drift over a year.
Worked examples at 0.0385
| Schedule | Hours/year | PTO earned/year | Per weekly paycheck |
|---|---|---|---|
| 20 h/week | 1,040 | 40.0 h | 0.77 h |
| 25 h/week | 1,300 | 50.0 h | 0.96 h |
| 30 h/week | 1,560 | 60.0 h | 1.15 h |
| 40 h/week | 2,080 | 80.0 h | 1.54 h |
(Annual figures use the unrounded rate, 80/2,080.)
Check the state minimum first
Federal law doesn't require paid vacation or sick leave for most private employers, but many states and cities require paid sick leave. A common minimum is 1 hour per 30 hours worked (0.0333 per hour), and some states use 1 per 40. If your PTO policy is meant to satisfy a sick-leave law, its accrual rate, caps, carryover, and waiting periods have to meet that law for every employee, part-time included. Our state guides note the paid-leave rules we checked in 10 states.
Decide these in writing
- Do overtime hours accrue PTO? Either answer is fine; just write it down.
- Balance cap and carryover. Some states restrict "use it or lose it" for vacation.
- Payout at termination. Several states, such as California, treat earned vacation as wages that must be paid out.
- Waiting period before PTO can be used. Accrual usually starts on day one.
FAQ
How do you calculate PTO for a part-time employee?
Divide the annual PTO hours a full-timer gets by full-time annual hours (for example, 80 ÷ 2,080 = 0.0385), then multiply by the hours the part-timer actually works each pay period.
Is PTO required by law for part-time employees?
Federal law doesn't require it for most private employers, but many states and cities require paid sick leave that part-time employees earn too, often 1 hour for every 30 hours worked.