What is PTO?
PTO stands for paid time off: hours or days you can take away from work while still being paid. Some employers keep separate buckets for vacation, sick leave and personal days; others pool everything into a single PTO bank that employees draw from for any reason. A pooled bank is simpler to track, which is one reason so many companies have moved to it, but it also means a long illness and a planned holiday compete for the same balance.
Entitlements differ enormously between employers, industries and countries. Some jurisdictions set a statutory minimum for paid leave, others leave it entirely to the employment contract, and unlimited or discretionary policies do not accrue a balance at all. This page does not assume any particular legal entitlement — it simply models the accrual rule you enter, so it works equally well for a contractual allowance, a company policy or an informal agreement.
How PTO accrual works
Accrual is the process of earning leave over time rather than receiving it all at once. There are four common patterns, and this calculator supports all of them.
Annual lump sum. The full allowance — say 20 days — lands in your bank on the first day of the leave year. It is the easiest model to understand, but employers usually prorate it for anyone who joins mid-year, and it can create a liability if someone leaves in January after taking three weeks off.
Monthly accrual. You earn a fixed amount each month, such as 1.5 days, which adds up to 18 days a year. Balances grow smoothly and mid-year joiners are handled automatically. This calculator only counts a month once its anniversary of your start date has passed, so a 30 March start date accrues on 30 April, not on 1 April.
Per pay period. PTO is credited on each payroll run, which keeps leave balances aligned with pay statements. Weekly, biweekly, semimonthly and monthly payrolls all produce a different number of accrual events across a calendar year.
Hourly accrual. Common for hourly, part-time and shift staff: you earn a set amount of PTO for every block of hours worked, such as one hour of PTO per 20 hours worked. Because it scales with actual hours, it is inherently fair to variable schedules.
PTO hours versus PTO days
Payroll systems almost always store PTO in hours, while people think in days. The conversion depends entirely on the length of a standard workday, which is why this calculator asks for it: 80 hours is 10 days on an 8-hour schedule, 10.67 days on a 7.5-hour schedule and 20 days for someone working 4-hour shifts. Part-time employees are the most common source of confusion — a three-day-a-week employee who accrues at 60% of the full-time rate still sees a balance in hours, and dividing it by a full-time day length overstates how many of their working days it covers.
Rounding matters too. Payroll systems commonly round each accrual event to the nearest quarter hour, and small differences compound across 26 pay periods. Use the rounding control above to match your employer’s practice; the default keeps two decimals so you can see the underlying figure.
Monthly and pay-period accrual examples
Monthly example. You started on 15 March and accrue 1.5 days per month at 8 hours a day. By 20 November you have completed eight monthly anniversaries (15 April through 15 November), so you have accrued 12 days, or 96 hours. Take away the 3 days you used in August and 9 days remain.
Biweekly example. You accrue 4 hours per pay period on a biweekly cycle from a 6 January start. By the end of September the calendar has produced 19 pay dates, so 76 hours have accrued — not the 20 periods you would assume from dividing 26 by 12 and multiplying by nine months. Counting real dates is the only reliable method, particularly in a year that contains 27 biweekly payroll runs.
Hourly example. At one PTO hour per 20 hours worked, 1,000 hours worked produces 50 hours of PTO, which is 6.25 days on an 8-hour schedule.
How to calculate remaining PTO
The full expression this page uses is: remaining PTO = (starting balance + carryover + accrued to date, limited by any cap) − PTO already used. Projected year-end PTO applies the same accrual rule forward to 31 December of the calculation year, which is the number to check before booking a long trip in December or before a use-it-or-lose-it deadline.
Edge cases are handled explicitly. A calculation date before your start date returns a clear message rather than a negative balance. Taking more leave than you have accrued produces a negative remaining figure with a warning, since some employers permit borrowing against future accrual and others do not. Hitting an accrual cap is flagged along with the number of hours sitting above it. Leap years are noted where they affect the number of days in the measured period, and zero-hour schedules are supported by setting workdays per week to zero and relying on hourly accrual.
Once you know your balance, plan around it with the business days calculator to see how many working days a trip actually consumes, and the vacation countdown once the dates are booked.