The short answer: to calculate PTO accrual, divide the paid time off an employee earns in a year by the time they work in a year. Per hour worked, that's annual PTO hours ÷ annual work hours. Per paycheck, it's annual PTO hours ÷ number of pay periods. Everything below is just applying that with real numbers.
What is PTO accrual?
PTO accrual means employees earn their paid time off gradually as they work, rather than receiving the whole year's balance up front. Someone might earn a few hours every paycheck, so by mid-year they've banked roughly half their annual allowance. It's the fairer, more common alternative to a lump-sum grant — especially for hourly staff and new hires.
The PTO accrual formula
Start with two numbers: how much PTO the employee gets per year, and the period you're accruing over. Then:
- Per hour worked: annual PTO hours ÷ annual work hours
- Per pay period: annual PTO hours ÷ number of pay periods in the year
A standard full-time year is 2,080 hours (40 hours × 52 weeks). Pay periods depend on your schedule: 52 weekly, 26 biweekly, 24 semi-monthly, or 12 monthly.
How to calculate the accrual rate per hour worked
Use this when PTO should track actual hours — the standard approach for hourly and part-time staff.
Example: a full-time employee gets 10 days (80 hours) of PTO a year.
- 80 PTO hours ÷ 2,080 work hours = 0.0385 hours of PTO per hour worked
- So an 80-hour biweekly paycheck earns 80 × 0.0385 = ~3.08 hours of PTO
- A part-timer who worked 50 hours that period earns 50 × 0.0385 = ~1.92 hours
How to calculate accrual per pay period
Use this for salaried staff, where each paycheck simply adds a fixed amount.
Example: the same 80 hours of annual PTO, paid biweekly (26 periods):
- 80 ÷ 26 = ~3.08 hours per paycheck
- Weekly (52): 80 ÷ 52 = ~1.54 hours
- Semi-monthly (24): 80 ÷ 24 = ~3.33 hours
- Monthly (12): 80 ÷ 12 = ~6.67 hours
For a more generous 15-day (120-hour) policy, just swap the numerator: 120 ÷ 26 = ~4.62 hours biweekly; 20 days (160 hours) = 160 ÷ 26 = ~6.15 hours.
Three rules that keep accrual clean
- Set a cap or carryover rule. Decide the maximum balance an employee can bank, and whether unused time rolls over, is paid out, or is lost at year-end. Without a cap, balances grow into a real liability.
- Decide what hours count. Does PTO accrue on overtime? On other paid leave? Most policies accrue on regular hours only — write it down and apply it consistently.
- Round the same way for everyone. Pick a rounding rule (say, to two decimals or the nearest quarter-hour) and use it across the board so no one's balance drifts.
Frequently asked questions
How many PTO days is two weeks?
For a full-time employee working 8-hour days, two weeks of PTO is 10 working days, or 80 hours. Most companies track PTO in hours rather than days so it works cleanly for part-time and hourly staff too.
How do you calculate a PTO accrual rate per hour worked?
Divide the annual PTO hours by the number of hours worked in a year. For 80 hours (10 days) of PTO and a 2,080-hour work year, that's 80 ÷ 2,080 = 0.0385 hours of PTO earned per hour worked.
What is a typical PTO accrual rate?
Many employers offer 10 to 20 days (80 to 160 hours) of PTO per year, often rising with tenure. On a biweekly schedule that works out to roughly 3.08 to 6.15 hours accrued each pay period.
Does PTO accrue on overtime hours?
That's a policy choice. Many employers accrue PTO only on regular hours up to a set cap and exclude overtime — but you should define it clearly in your policy and apply it the same way for everyone.
The math is simple; keeping every balance right across a whole team, every pay period, is where it gets fiddly. That's what a system is for — accruing automatically, applying your caps and carryover rules, and showing each person their live balance. For the policy decisions behind the numbers, see our guide to building a PTO policy, and if you're setting up people operations from scratch, our employee onboarding checklist and guide to HR software for small businesses cover the rest.
FulcrumGrid HR Suite
Let accruals run themselves
HR Suite accrues PTO automatically on your schedule, applies your caps and carryover rules, and shows every employee their live balance — no spreadsheets, no month-end reconciling.