PTO Calculator: How to Calculate PTO Accrual by Hand

To calculate PTO accrual, divide the annual PTO hours an employee earns by the hours they work in a year, or by the number of pay periods. For example, 80 hours of PTO for a full-time employee working 2,080 hours accrues about 0.0385 hours per hour worked, or about 3.08 hours per biweekly paycheck.

Key takeaways

  • Pick one accrual method (per hour worked, per pay period or annual lump sum) and apply it consistently.
  • Convert days to hours before calculating, using the employee's standard workday.
  • Caps, carryover and payout rules change balances as much as the accrual rate does.
  • State law, not federal law, decides most PTO payout and forfeiture questions.

What are the basic PTO formulas?

Per hour worked

Accrual rate = annual PTO hours / annual hours worked

A full-time schedule of 40 hours a week for 52 weeks is 2,080 hours. If the policy grants 120 hours (15 eight-hour days), the rate is 120 / 2,080 = 0.0577 hours per hour worked. An employee who works 86 hours in a pay period earns 86 x 0.0577 = 4.96 hours.

Per pay period

Accrual per period = annual PTO hours / pay periods per year

Weekly payroll has 52 periods, biweekly has 26, semimonthly has 24 and monthly has 12. This method is simpler for salaried staff whose hours do not vary.

Annual lump sum (front-loading)

The full year's PTO is granted at once, often on January 1 or the hire anniversary. No accrual math is needed, but you need rules for mid-year hires and for employees who leave after using more than they would have earned.

PTO accrual quick-reference table

These figures assume a full-time, 2,080-hour year. Rates are rounded to two or four decimal places; keep more precision in your system to avoid rounding drift over a year.

Annual PTOPer hour workedWeekly (52)Biweekly (26)Semimonthly (24)Monthly (12)
40 hours (5 days)0.01920.771.541.673.33
80 hours (10 days)0.03851.543.083.336.67
120 hours (15 days)0.05772.314.625.0010.00
160 hours (20 days)0.07693.086.156.6713.33
200 hours (25 days)0.09623.857.698.3316.67

How do you calculate PTO for part-time and variable-hour employees?

The per-hour-worked method handles part-time and variable schedules automatically: the employee earns at the same rate as full-time staff, but on fewer hours. A part-time employee on the 80-hour policy who works 1,040 hours in a year earns 1,040 x 0.0385 = about 40 hours.

If you use per-pay-period accrual, prorate by FTE instead: annual PTO x FTE / pay periods. A 0.6 FTE employee on a 120-hour biweekly policy earns 120 x 0.6 / 26 = 2.77 hours per paycheck.

Decide whether overtime hours earn PTO. Many policies accrue only on regular hours, and a related question is whether PTO hours count toward overtime; we cover that in whether PTO, vacation and sick time count toward overtime.

How do caps, carryover and payout work?

Accrual caps

A cap stops accrual when the balance reaches a set number of hours. Accrual resumes once the employee uses time and drops below the cap. Example: a cap of 1.5 times the annual grant (180 hours on a 120-hour policy).

Carryover limits

A carryover rule limits how much unused time moves into the next year. Be careful: some states treat earned vacation as wages. California's Labor Commissioner, for instance, states that use-it-or-lose-it policies that forfeit earned vacation are illegal there, though reasonable accrual caps are allowed.

Payout value

Payout = unused hours x current hourly rate. For salaried staff, the hourly rate is annual salary / 2,080. An employee with 36 unused hours at $28.50 an hour has a payout value of $1,026. The US Department of Labor notes that the FLSA does not require payment for time not worked, such as vacations, so payout requirements come from state law and your own policy. California, for example, requires earned, unused vacation to be paid in the final paycheck.

Common calculation mistakes

  • Mixing days and hours in the same policy.
  • Rounding each period's accrual to whole numbers, which shortchanges or overpays over time.
  • Forgetting to stop accrual during unpaid leave if the policy says so.
  • Applying a tenure tier increase on the wrong date.

Once your formulas are right, test them in your timekeeping system with real scenarios. Our UKG accrual policy setup and testing guide shows a test plan you can adapt to any platform.

Frequently Asked Questions

How many PTO hours is 15 days?

For an employee with an eight-hour standard workday, 15 days equals 120 hours. For a ten-hour workday schedule, the same 15 days equals 150 hours. Always convert using the employee's normal scheduled day so a day off covers a full shift, and state the conversion in the written policy.

Is accrual or front-loading better?

Accrual matches time earned to time worked and limits exposure when employees leave early. Front-loading is simpler and lets new hires take time sooner, but it can create negative balances. Choose based on turnover, payroll system capabilities and state payout rules. Some employers compare both against the costs described in what unlimited PTO really costs employers.

Can employees accrue PTO during their first 90 days?

Many employers start accrual on day one but restrict use until after an introductory period. Others delay accrual itself. Check state and local paid sick leave laws, which may require accrual to start at hire and set a maximum waiting period before use, separate from any vacation policy.

Next steps

  1. Write down your policy's annual grant, method, cap, carryover and payout rules.
  2. Calculate the per-period rate using the table or formulas above.
  3. Check state rules for every location where you have employees.
  4. Test three real employee scenarios in your payroll or time system.

Last reviewed: October 2026.

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