How to Calculate PTO Accrual
To calculate PTO accrual, find out how your policy grants PTO and use the matching formula. Per pay period: yearly hours ÷ pay periods in the year (80 hours ÷ 26 biweekly periods is 3.08 hours per paycheck). Per hour worked: hours worked × your rate (80 hours × 0.0385 is 3.08 hours). Your balance is then your starting balance plus everything accrued, plus or minus adjustments, minus the time off you used.
Step 1: find your accrual method
Your handbook, offer letter or pay stub usually says one of these:
- A fixed amount per pay period, such as 4 hours every paycheck.
- A yearly amount spread across pay periods, such as 80 hours a year.
- A rate per hour worked, such as 0.0385 hours per hour.
- A lump sum granted at the start of the year (also called front-loaded). Nothing accrues; you only subtract what you use.
Step 2: apply the formula
| Method | Formula | Synthetic example |
|---|---|---|
| Fixed per pay period | hours per period × periods completed | 4 h × 3 periods = 12 h |
| Yearly amount, biweekly | yearly hours ÷ 26 | 80 ÷ 26 = 3.08 h per paycheck |
| Yearly amount, semimonthly | yearly hours ÷ 24 | 80 ÷ 24 = 3.33 h per paycheck |
| Yearly amount, monthly | yearly hours ÷ 12 | 80 ÷ 12 = 6.67 h per month |
| Per hour worked | hours worked × rate | 80 h × 0.0385 = 3.08 h |
Biweekly and semimonthly are not the same: 26 paychecks a year against 24. The pay period guide explains why, and what happens in a year with 27 biweekly paydays.
Step 3: work out your balance
Balance = starting balance + accruals + adjustments − time off used.
Synthetic example. You start the year with 10 hours, accrue 4 hours in each of 3 completed pay periods, and take 5 hours off: 10 + 3 × 4 − 5 = 17 hours. The PTO accrual calculator reproduces this example and shows every pay period as a row.
Step 4: check the cap and rounding
- Accrual cap: if your policy limits the balance, for example to 120 hours, accruals stop when you reach it and start again after you use time off. See what an accrual cap does.
- Rounding: payroll systems often round each accrual to two decimals or to the minute. Small differences between your math and your pay stub usually come from rounding.
Frequently asked questions
How does PTO accrual work?
You earn PTO gradually instead of receiving it all at once. Each time a pay period ends, or for each hour you work, your employer adds a set amount to your balance, following the written policy.
What is the formula for PTO accrual?
For a yearly amount paid out over pay periods, divide the yearly hours by the number of pay periods. For an hourly rate, multiply hours worked by the rate. The balance is the starting balance plus accruals and adjustments, minus time off used.
How do I calculate my PTO accrual rate?
Divide the yearly PTO hours by the hours worked in a full year. 80 hours ÷ 2,080 hours is about 0.0385 hours of PTO per hour worked. The hourly PTO calculator does this for you.
Why does my pay stub show a different number?
Usually because of rounding, a cap, an accrual that has not posted yet, or time off that was approved but not yet taken. Compare your calculation with each line of your pay stub, period by period.