PTO Accrual Calculator
Calculate how much paid time off you have earned at any point in the year. Supports per-pay-period, monthly, and hourly accrual systems — plus projected year-end balance and day-equivalent conversions.
How PTO Accrual Works
Most US employers grant paid time off through an accrual system — a method that lets employees earn a small portion of their annual PTO with each pay period, each month, or each hour worked. The core formula is simple:
Accrual per period = Annual PTO ÷ Pay periods per year
Accrual per hour = Annual PTO ÷ (52 × 40)
If you receive 120 hours (15 days) of PTO per year on a biweekly payroll, you accrue 4.615 hours every two weeks. On an hourly accrual model, that same benefit works out to roughly 0.058 PTO hours for every hour worked, which the payroll system posts to your balance automatically.
Common PTO Accrual Systems
| System | How it works | Best for |
|---|---|---|
| Lump sum | Full balance granted on Jan 1 or anniversary | Tenured salaried staff |
| Per pay period | Fixed amount added each payroll run | Most salaried workforces |
| Hourly accrual | Earn PTO only on hours actually worked | Hourly, part-time, variable schedules |
| Tenure banded | Accrual rate increases with years of service | Retention-focused orgs |
Example Scenarios
Example 1 — New hire at 15 days PTO: After 13 weeks (one quarter), the employee has accrued 30 PTO hours (about 3.75 days), even though the full 120-hour bank won't appear until year-end.
Example 2 — Unlimited vs accrued: A company switching from 15 days of accrued PTO to an unlimited policy effectively eliminates the payout liability on their books — a common reason employers favor the change, despite employees sometimes taking fewer days under unlimited plans.
Why PTO Tracking Matters
For employers, PTO is a liability on the balance sheet — every unused hour represents a potential future wage payment. For employees, understanding exactly how much time you have earned prevents overdrawing your balance and helps you plan vacations around accrual milestones. HR teams use accrual forecasts to manage coverage during peak vacation seasons and negotiate PTO-cap policies.
Related HR Calculators
- Work hours per year calculator — see your actual annual working hours after PTO and holidays.
- Absenteeism rate calculator — benchmark unplanned time off.
- True employee cost calculator — PTO liability factors into fully-loaded labor cost.
- Salary to hourly conversion — value an hour of PTO in dollars.
- FTE calculator — convert headcount to full-time equivalents.
- All HR calculators
Frequently Asked Questions
How is PTO accrued per pay period calculated?
Divide your annual PTO hours by the number of pay periods in a year. For example, 120 PTO hours ÷ 26 biweekly pay periods = 4.615 hours accrued per pay period.
What is the difference between lump-sum and accrual PTO?
Lump-sum PTO grants your full annual balance on day one of the year (or anniversary). Accrual PTO earns small amounts each pay period, month, or per hour worked. Accrual systems protect employers from paying out unused time if an employee leaves mid-year.
Are employers required to pay out unused PTO?
It depends on state law and company policy. States like California, Colorado, and Montana treat accrued PTO as earned wages that must be paid on separation. Many other states leave it to employer policy. Always check your local labor code.
How many PTO days is standard in the US?
According to the Bureau of Labor Statistics, private-industry workers average about 11 paid vacation days after one year of service, 15 after five years, and 20 after twenty years. Many modern companies now offer 15–25 days at hire, plus separate sick leave.
Can PTO carry over to the next year?
Carryover policy is set by the employer, subject to state law. Some companies allow unlimited carryover, others cap it (for example, 40 hours max), and some use 'use-it-or-lose-it' rules where unused time expires. California prohibits strict use-it-or-lose-it policies.
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