How to Calculate PTO Accrual for Part-Time Employees
Updated June 6, 2026
Part-time PTO is usually accrued pro-rata — earned in proportion to hours worked. Here's the simple formula, a couple of worked examples, and how to automate it so balances are always right.
The pro-rata accrual formula
The fairest method is accrual-per-hour-worked: decide how much PTO a full-time employee earns, divide by full-time hours to get a rate, then multiply by the part-timer's actual hours. This way someone working half the hours earns half the PTO automatically.
Accrual rate = annual full-time PTO hours ÷ annual full-time hours. PTO earned = accrual rate × hours the part-timer works.
Worked examples
Say full-time is 2,080 hours/year with 80 hours (10 days) of PTO — a rate of about 0.0385 PTO hours per hour worked.
| Hours worked | PTO earned |
|---|---|
| 20 hrs/week (~1,040/yr) | ~40 hrs (5 days) |
| 25 hrs/week (~1,300/yr) | ~50 hrs (6.25 days) |
| 1 pay period (40 hrs) | ~1.54 hrs |
Automate it (don't do it by hand)
Per-hour accrual is exactly the kind of thing that drifts in a spreadsheet. Use the free calculator for a quick figure, or let Orvella accrue per-hour automatically so every part-timer's balance stays accurate.
Orvella accrues part-time PTO per hour worked automatically — no spreadsheets, no drift, always auditable.
Frequently asked questions
How is part-time PTO usually calculated?
Pro-rata by hours worked: full-time PTO ÷ full-time hours gives an accrual rate, multiplied by the part-timer's actual hours. Half the hours, half the PTO.
Do part-time employees get the same PTO as full-time?
Typically not the same total — they accrue proportionally to hours worked, which keeps it fair across schedules.
Can Orvella do this automatically?
Yes — Orvella supports per-hour accrual, so part-time balances calculate themselves and stay auditable.