About the PTO accrual calculator
Most US employers do not hand you a year of paid time off on day one. They credit a fixed number of hours each pay period, so your balance grows steadily as you work. This calculator turns that drip into a real number: enter the hours earned per pay period, how often you are paid, and how long you have worked, and it shows the PTO you have banked, what you have left after time already taken, and how that converts to days and weeks.
The most common arrangement is biweekly accrual. Earning 4 hours per pay period across 26 pay periods a year gives 104 hours, which is 13 eight-hour days or about 2.6 weeks of leave annually. Employers vary the rate by tenure, often stepping it up after one, five, and ten years. Some skip accrual entirely and front-load the full annual grant on January 1. Carryover rules differ too: use-it-or-lose-it caps are legal in many states, but a handful, including California, treat accrued vacation as earned wages that cannot be forfeited.
How it works: the formula
PTO accrual is hours earned per pay period multiplied by the number of pay periods elapsed, minus what you have already used:
periods_elapsed = pay_frequency x (months_worked / 12) accrued = hours_per_period x periods_elapsed balance = accrued - hours_already_used days = balance / 8
- hours_per_period is the figure on your offer letter or policy, for example 4 hours biweekly.
- pay_frequency is the number of pay periods per year: 26 biweekly, 24 semi-monthly, 12 monthly, 52 weekly.
- months_worked scales the annual periods down to the slice of the year you have actually worked.
- balance is your current available hours; divide by 8 for an eight-hour workday to read it in days.
Worked example
Accruing 4 hours per pay period, paid biweekly (26 periods), 12 months worked, 16 hours already taken:
- Periods elapsed: 26 x (12 / 12) = 26 pay periods.
- Accrued: 4 x 26 = 104 hours.
- Balance after use: 104 - 16 = 88 hours.
- In days: 88 / 8 = 11 days.
- In weeks: 11 / 5 = 2.2 weeks of leave still available.
Reference: accrual rate to annual PTO
Hours per biweekly pay period (26 periods) and the annual total they produce:
| Hours per pay period | Annual hours | Annual days (8h) | Roughly |
|---|---|---|---|
| 1.54 | 40 | 5 | 1 week |
| 3.08 | 80 | 10 | 2 weeks |
| 4.00 | 104 | 13 | 2.6 weeks |
| 4.62 | 120 | 15 | 3 weeks |
| 6.15 | 160 | 20 | 4 weeks |
Common pitfalls
- Confusing pay frequency with accrual rate. The same 104 annual hours can be 4 per biweekly period or 8.67 per monthly period; match the rate to how often you are actually paid.
- Assuming front-loaded equals accrued. If your employer grants the full year on January 1, accrual math does not apply; you have it all immediately but may owe it back if you leave mid-year.
- Ignoring accrual caps. Many policies stop accrual once your balance hits a ceiling (often 1.5 to 2 times the annual rate), so hours stop building until you take leave.
- Forgetting state rules on forfeiture. Use-it-or-lose-it is banned in some states; in California accrued vacation is treated as earned wages and must be paid out, never zeroed.
- Mixing PTO and sick leave. Some employers track them separately with different accrual rates and carryover rules; do not lump them into one balance.
Frequently asked questions
How much PTO is 4 hours per pay period?
Paid biweekly, 4 hours per pay period across 26 periods is 104 hours a year. At an eight-hour workday that is 13 days, or about 2.6 weeks of paid leave. Paid weekly across 52 periods, the same 4-hour rate would be 208 hours, so the pay frequency matters as much as the rate.
How do I convert PTO hours to days?
Divide the hour balance by the length of your standard workday, usually 8 hours. So 88 hours is 11 days, and 120 hours is 15 days. If you work 10-hour shifts, divide by 10 instead; the calculator assumes an 8-hour day unless your schedule differs.
What is the difference between accrued and front-loaded PTO?
Accrued PTO is earned gradually, a set number of hours each pay period, so your balance grows over the year. Front-loaded PTO is granted in full at the start of the year. Front-loading gives you the whole balance immediately, but if you leave mid-year having used more than you accrued, some employers recover the difference from your final pay.
Can my employer take away unused PTO?
It depends on your state. Use-it-or-lose-it policies are legal in many states, capping carryover at year end. Others, including California, treat accrued vacation as earned wages that cannot be forfeited and must be paid out when you leave. Check your state's labor rules and your written policy.
Does PTO keep accruing after I hit the cap?
Usually not. Many policies set an accrual ceiling, often around 1.5 to 2 times the annual rate, and pause earning once you reach it. Accrual resumes after you take leave and your balance drops below the cap, so banking too many hours can quietly stop you from earning more.