To calculate vacation accrual for hourly employees, divide the annual vacation hours the employer promises by the annual work hours, then multiply that per-hour rate by the hours actually worked in each pay period. For a full-time worker with 80 hours of vacation and a 2,080-hour work year, the rate is 80 ÷ 2,080 = 0.0385 hours of vacation per hour on the clock. An 80-hour biweekly paycheck earns 0.0385 × 80 = 3.08 hours of vacation, and 26 pay periods bring the total to roughly 80 hours by year’s end.
The Two Numbers You Need First
Everything depends on two inputs, and both come from your employer, not from any legal minimum. Federal law does not require paid vacation at all, so whatever your handbook, offer letter, or collective bargaining agreement promises is the figure to use.1U.S. Department of Labor. Vacation Leave
The first number is your annual vacation entitlement in hours. Two weeks (80 hours) is a common baseline for full-time workers, and Bureau of Labor Statistics data shows full-time employees at small private firms average about 8 days after one year of service and roughly 16 days after ten years.2U.S. Bureau of Labor Statistics. Average Paid Holidays and Days of Vacation and Sick Leave for Full-Time Employees Your own number can differ based on seniority tier or job classification.
The second is total annual work hours. A standard 40-hour week over 52 weeks gives you 2,080. Part-time employees plug in their own expected annual total.
Before doing the math, check two policy details that quietly change the result. First, which hours count toward accrual. Some employers credit only regular hours worked. Others include paid holidays, jury duty, or other paid leave. Overtime hours are frequently excluded from the accrual pool, but only the written policy tells you for certain. Second, when accrual starts. Many employers impose a probationary period, often 90 days, before any hours begin accumulating. If either detail is different from what you assumed, your running balance will drift from the official one.
The Accrual Rate Formula
The rate is a single decimal that turns every hour of work into a fraction of vacation:
Accrual rate = Annual vacation hours ÷ Annual work hours
Common allotments for a 2,080-hour work year:
- 40 hours (1 week): 40 ÷ 2,080 = 0.0192 per hour worked
- 80 hours (2 weeks): 80 ÷ 2,080 = 0.0385 per hour worked
- 120 hours (3 weeks): 120 ÷ 2,080 = 0.0577 per hour worked
That decimal stays fixed all year unless the employer changes your allotment, usually because you hit a new seniority tier.
Applying the Rate Each Pay Period
Once you have the rate, the per-period math is a single multiplication:
Vacation earned = Accrual rate × Hours worked in the pay period
The reason to build the calculation on hours worked rather than a flat weekly grant is that hourly schedules fluctuate. Take the 0.0385 rate. A steady 80-hour biweekly period earns 3.08 hours. A lighter 65-hour period earns 2.50. A heavier 45-hour week earns 1.73. By design, the totals still land close to the annual entitlement because every qualifying hour on the clock produces the same slice of leave.
Most payroll systems run this multiplication automatically and post the result to your pay stub under a leave balance or year-to-date accrual line. Check it yourself anyway. Rounding differences that shave a tenth of an hour off each period can quietly cost you a full day of vacation over a year.
Part-Time Schedules
The formula does not change for part-time workers. If a part-time employee is promised 40 hours of annual vacation and expects to work 1,040 hours (20 hours per week), the rate is 40 ÷ 1,040 = 0.0385 per hour. Every hour worked still earns the same fraction of leave.
Watch for a policy mismatch. If the handbook grants “80 hours of vacation” as a flat lump sum with no distinction between full-time and part-time, a part-time worker gets the same 80 hours as a full-timer. If the same 80 hours is instead described as an accrual tied to hours worked, a half-time employee accrues at half the pace. Read carefully to see whether vacation is granted or accrued, because the financial outcome is different.
Mid-Year Hires
An employee who starts partway through the year will not work a full 2,080 hours. Under a per-hour accrual policy, no separate proration is needed. The formula prorates itself: fewer hours worked produces fewer vacation hours earned. Someone hired July 1 who logs roughly 1,040 hours by December 31 earns about half the annual allotment automatically.
Lump-sum grants are different. If the employer hands out the full annual entitlement at the start of each calendar year, a mid-year hire needs an explicit proration. A common method: divide the calendar days from hire date through December 31 by 365, then multiply by the annual allotment. An employee hired May 1 with a 10-day annual entitlement gets (244 ÷ 365) × 10 ≈ 6.7 days for the partial first year.
How Rounding Can Change Your Balance
Accrual math produces long decimals, and payroll systems round them. Federal regulations allow employers to round employee time to the nearest 5 minutes, one-tenth of an hour, or quarter hour, as long as the rounding averages out and does not systematically shortchange workers.3eCFR. 29 CFR 785.48 – Use of Time Clocks The same principle applies to how leave balances are rounded.
Under the common quarter-hour method, 1 to 7 minutes round down and 8 to 14 round up. Applied to accrual, an earned balance of 3.12 hours may appear as 3.0 on your stub, while 3.13 may appear as 3.25. The rule is that rounding must even out over time. If your balance consistently comes in below what the formula predicts, that is a signal to raise it with payroll.
Caps and Use-It-or-Lose-It Rules
Two policy features can stop the formula from producing what it looks like it should.
Maximum Balance Caps
Many employers set a ceiling on how much vacation you can bank, often 120 or 160 hours. Once you hit the cap, no new hours accrue until you use some. If your balance sits at 119 hours with a 120-hour cap and you earn 3.08 hours that period, only 1 hour is added. The remaining 2.08 hours are gone. Using vacation before hitting the ceiling, not after, is the only way to avoid losing time you have already worked to earn.
Year-End Forfeiture
Separately, some employers require you to use vacation within the calendar year or forfeit the rest. These use-it-or-lose-it policies are legal in most states. Only about four, including California, Colorado, Montana, and Nebraska, prohibit them outright by treating earned vacation as wages that cannot be taken away. Elsewhere, if the handbook says unused vacation expires December 31, it does.
Caps and forfeiture rules work independently. A generous 200-hour cap paired with a strict year-end reset still zeroes you out every January. Check for both.
Keep Your Own Running Total
Federal record-keeping rules require employers to track hours worked, pay rates, and total wages each pay period, but they do not explicitly require handing you a running vacation balance as a separate line item.4eCFR. 29 CFR Part 516 – Records to Be Kept by Employers Your employer likely tracks it internally, but the federal rules do not guarantee it will appear on your stub.
Save every pay stub that shows a leave balance, and run the accrual formula yourself at least once a quarter. When hours fluctuate, the only reliable way to confirm the number is accurate is to check the multiplication period by period. If a dispute ever comes up about how much vacation you have earned, those personal records are the strongest evidence you can bring alongside the employer’s payroll data.