PTO Accrual Calculator
Estimate how much paid time off you will have accrued by any date. Enter your accrual rate, pay frequency, date range, carry-over balance, hours already used and an optional cap.
Estimate Your Paid Time Off Balance
PTO Accrual Formula
Where:
- \(d\) — number of calendar days between the start and end date
- \(p\) — number of accrual periods per year (52 weekly, 26 biweekly, 24 semimonthly, 12 monthly, 1 yearly)
- \(n\) — number of accrual periods elapsed (prorated continuously)
- \(r\) — accrual rate, in PTO hours earned per period
- \(E\) — PTO hours earned in the period
- \(S\) — starting PTO balance (carry-over), in hours
- \(T\) — PTO hours already taken during the period, in hours
- \(c\) — accrual cap, in hours (0 means no cap)
- \(B\) — remaining PTO balance at the end date, in hours
The formula converts the elapsed time into pay periods, multiplies by your accrual rate to get the hours earned, adds any carry-over, applies the cap if one exists, and subtracts leave you have already used.
PTO Accrual – Calculation Example
{example}
Example: an employee earns 3.08 hours of PTO every 2 weeks, starting January 1, 2025 with no carry-over balance. They want to know their balance on December 31, 2025 and have already used 8 hours of leave during the year.
\[ d = 364 \text{ days}, \quad n = 364 \times \frac{26}{365.25} \approx 25.91 \text{ biweekly periods} \]
\[ E = 25.91 \times 3.08 \approx 79.81 \text{ h} \]
\[ B = 0 + 79.81 - 8 = 71.81 \text{ h} \]
Result: the employee will have earned 79.81 hours of PTO during the year and will have 71.81 hours remaining — about 8.98 eight-hour working days of paid time off.
{/example}
How to Use the Calculator
- Enter your Accrual Rate — the number of PTO hours you earn per pay period (e.g. 3.08).
- Select the Accrual Frequency that matches your payroll: weekly, every 2 weeks, twice a month, monthly, or once a year.
- Set the Start Date — typically your hire date or January 1 — and the End Date for which you want the balance.
- Enter your Starting PTO Balance (hours carried over from the previous period) and the Leave Already Taken during the date range.
- If your employer limits how many hours you can bank, enter that limit in Accrual Cap; otherwise leave it at 0.
- Read your results: hours earned, total accrued, remaining balance, the equivalent in working days, your annual accrual rate, and a detailed breakdown.
What Is PTO Accrual?
Paid time off (PTO) accrual is the process by which employees gradually earn vacation, sick or personal leave as they work. Instead of receiving a lump of days at the start of the year, most employers add a small number of hours to your balance every pay period. For example, a common policy is 80 hours (two weeks) per year, which for biweekly payroll works out to 80 / 26 = 3.08 hours per paycheck — the default rate in this calculator.
Because accrual happens continuously, your balance at any moment depends on how long you have worked and how much leave you have already spent. That is exactly what this tool computes: it takes your rate and frequency, measures the time between your start and end dates (using our days between dates logic), and reports how many hours you will have banked.
The result is expressed both in hours and in equivalent working days, assuming a standard 8-hour day. A balance of 71.81 hours, for instance, means you could take roughly nine full days off. If the remaining balance is negative, you have used more PTO than you had accrued by the end date — many employers track this as a negative balance that future accruals will repay.
Accrual also matters for planning ahead. If you know your annual rate (shown in the results), you can estimate when you will have enough hours saved for a longer trip, or check whether you are on track to hit your company's accrual cap before the end of the year.
Assumptions and Limitations
- Continuous proration: the calculator treats a year as 365.25 days and accrues fractionally by calendar day. Real payrolls often credit hours only on pay-period boundaries, so your actual balance may differ by a fraction of one period.
- No cap interaction with usage: the cap is applied to the total accrued (carry-over plus earnings). If you take leave mid-period, some employers apply the cap differently — for instance only to unused hours at year end.
- 8-hour workday: the "equivalent working days" figure assumes 8-hour days. If you work 7.5- or 6-hour shifts, divide the remaining hours by your actual day length.
- Full-time, continuous service: the calculation assumes you accrue at the same rate for the entire date range. Part-time schedules, unpaid leave, probationary periods, or rate increases partway through the year are not modeled — split the range into segments and add the results, or adjust the rate manually.
- Policy details: some companies use an "accrue then cap" system, others a "use it or lose it" rule, and vacation payout laws vary by jurisdiction. Always check your employee handbook or HR portal for the authoritative numbers.
Practical Tips
- To convert an annual allowance into a per-period rate, divide your yearly hours by the number of pay periods: 120 h/year ÷ 24 semimonthly periods = 5 h per period.
- Use a future end date to plan a vacation — you can see how many hours you will have banked by the time you want to travel. Our date addition calculator can help you find the exact date.
- If you are close to a cap, consider scheduling leave before the cap kicks in; hours that would be earned above the cap are typically lost.
- When changing jobs, you can also estimate how PTO accrual over your tenure compares with your total time employed using the age calculator style year-and-month breakdowns in the details output.
Frequently Asked Questions
How do I calculate PTO accrual by hand without a calculator?
Divide the number of calendar days you have worked by 365.25, multiply by the number of pay periods per year, then multiply by your hours per period. For example, 182 days at 4 hours per monthly period gives \( 182 \times 12 / 365.25 \times 4 \approx 23.9 \) hours. Add any carry-over, apply your cap, and subtract leave already taken to get your balance.
What is a normal PTO accrual rate?
In the US, 10 to 15 vacation days per year (80–120 hours) is common, with many companies adding separate sick leave. On biweekly payroll that equals roughly 3.08 to 4.62 hours per paycheck. Tenure-based tiers are also widespread — employees often jump to 15–20 days after 5 or 10 years of service. Your actual rate depends on your contract, state law, and company policy, so check your offer letter or HR portal.
How do I convert my annual PTO allowance into a per-period rate?
Divide your yearly hours by the number of pay periods: 26 for biweekly, 24 for semimonthly, 12 for monthly. For example, 120 hours per year on semimonthly payroll is 120 ÷ 24 = 5 hours per period. Do not confuse biweekly and semimonthly — they differ by two periods per year, which will quietly overstate your accrual if you pick the wrong one.
Why does my result differ slightly from what my pay stub or HR system shows?
This tool accrues fractionally by calendar day, while most payroll systems credit hours only once per pay period. So your real balance can lag or lead the estimate by up to one period's worth of hours (e.g. about 3 hours for a biweekly 80-hour plan). Timing of leave deductions and rounding rules also cause small differences — usually well under half a day.
What does a negative PTO balance mean?
A negative balance means you took more leave than you had accrued — often called borrowing or an advance on PTO. Many employers allow it and simply deduct the deficit from future accruals. However, if you leave the company while negative, some states let the employer deduct that amount from your final paycheck. Check your policy before planning leave beyond your accrued hours.
How does an accrual cap or "use it or lose it" policy affect my balance?
With a cap, once carry-over plus earnings reach the limit, further accrual stops until you take leave. For example, with a 160-hour cap you stop earning at 160 hours regardless of tenure. "Use it or lose it" policies instead forfeit unused hours at year end. Note that some jurisdictions, such as California, effectively ban forfeiting earned vacation — caps must be reasonable there, so verify what your local rules allow.
How do I calculate PTO if my rate changes mid-year or I work part-time?
Split the date range into segments, run the calculation once per segment with the applicable rate, and add the results. For example, calculate January–June at 3.08 hours per biweekly period, then July–December at 4.62 hours after a tenure increase, including the first segment's ending balance as the second segment's carry-over. Part-time employees can enter their prorated per-period rate directly.