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How to Calculate PTO Accrual From Hours Worked

By Frame Sixty Labs · Last updated: September 28, 2026

What are the common ways PTO accrues?

Paid time off (PTO) usually builds up gradually rather than arriving all at once. How it builds up decides what you need to calculate. These are the methods you will see most often, using a policy of 80 hours a year (two weeks at 8 hours a day) as the example:

Flat methods are easy: the amount is the same every period. Per-hour accrual is the one that needs arithmetic, because it follows your timesheet — short weeks earn less, long weeks earn more, and part-time schedules are prorated automatically.

How do you calculate an hourly accrual rate?

Divide the annual PTO hours by the hours the policy assumes you work in a year. For a full-time 40-hour week that basis is 40 × 52 = 2,080 hours. Here are the rates for common policies, and what they add up to in a full 40-hour week and a full 80-hour two-week period:

The H:MM figures are rounded to the nearest minute. The shortcut column is exact, which is useful because it avoids a long decimal: 80 hours a year on a 2,080-hour basis means one hour of PTO for every 26 hours worked.

Why does rounding the rate matter?

Because the rate gets multiplied by every hour you work all year. Take the 80-hour policy and a full 2,080-hour year:

• 0.03846 (or ÷ 26): 80.00 hours — correct
• 0.0385: 80.08 hours — about 5 minutes too much
• 0.038: 79.04 hours — about 58 minutes short
• 0.04: 83.20 hours — 3 hours 12 minutes too much

Keep at least four or five decimal places in the rate, or use the exact fraction. If your pay stub’s accrual doesn’t match your own math, a rounded rate is one of the first things to check.

How do you calculate PTO accrual for a pay period?

1. Find the annual PTO hours and the basis hours in your handbook or offer letter — for example 80 hours on a 2,080-hour year.
2. Divide to get the rate: 80 ÷ 2,080 = 0.038462.
3. Total the eligible hours for the period in H:MM, carrying every 60 minutes into an hour. (See how to calculate a weekly timesheet.)
4. Convert the total to decimal hours: minutes ÷ 60. 73:35 is 73.5833.
5. Multiply by the rate, and convert back to H:MM if your balance is shown that way.
6. Update the balance: add what you earned, subtract what you used, and check any cap.

Worked example: a two-week pay period with uneven hours

An hourly employee earns 80 hours of PTO a year, accrued per hour worked on a 2,080-hour basis. Unpaid breaks are already taken out of each day. Here is the biweekly timesheet:

Week 1 in H:MM: 7:45 + 8:10 = 15:55, + 6:30 = 22:25, + 8:00 = 30:25, + 7:50 = 38:15. Week 2: 8:20 + 7:40 = 16:00, + 8:05 = 24:05, + 5:15 = 29:20, + 6:00 = 35:20. The period is 38:15 + 35:20 = 73:35.

Convert: 73 + 35 ÷ 60 = 73.5833 hours. Then accrue:

73.5833 ÷ 26 = 2.8301 hours of PTO, which is 2:50 (0.8301 × 60 = 49.8 minutes).

Two useful comparisons:

• A flat biweekly policy for the same 80 hours a year would credit 3.0769 hours (about 3:05) no matter what the timesheet said. Per-hour accrual paid about 15 minutes less here because this was a short period.
• A 1-per-30 sick-leave policy on the same hours would credit 73.5833 ÷ 30 = 2.4528 hours, about 2:27.

The common slip is typing the totals as if they were decimals: 38.15 + 35.20 = 73.35, which is 14 minutes short of 73:35 before the rate is even applied. Minutes are sixtieths of an hour, not hundredths — hours to decimal has the full conversion table.

How do you keep a running PTO balance?

Treat it like any other hours total: add accruals, subtract time used, and keep it in one unit. Say the balance before this pay period was 12:30, the period earned 2:50, and you took an 8-hour day off:

12:30 + 2:50 = 15:20, then 15:20 − 8:00 = 7:20.

In decimal that is 12.5 + 2.8333 − 8 = 7.3333 hours. If your pay stub shows decimal and your own record shows H:MM, convert one side before comparing — 7.33 on the stub and 7:20 in your notes are the same balance. Many policies also cap the balance or limit carryover into a new year; once you hit a cap, accrual usually stops until you use some time.

How do part-time and non-standard schedules work?

Per-hour accrual prorates on its own. A part-time employee on the same 80-hour policy who works 25:00 a week earns 25 ÷ 26 = 0.9615 hours a week, about 0:58, and 1,300 ÷ 26 = 50 hours over 52 weeks. (Part-time vs full-time hours covers how to total an irregular part-time week.)

Days are where schedules get tricky. PTO is usually counted in hours, so a day off costs the hours you were scheduled that day: ten days at 8 hours is 80 hours, but on a 4/10 schedule each day off takes 10 hours, so the same 80 hours covers 8 days. 4/10 and 9/80 schedules walks through the holiday version of that gap.

Which hours count toward accrual?

That is set by the policy, and it is worth checking because it changes the number:

• Overtime: some policies accrue on every hour worked; others cap eligible hours at 40 a week or 80 a pay period.
• PTO and holiday hours: many policies do not let paid-but-not-worked hours earn more PTO.
• Waiting periods: some employers start accrual, or allow use, only after a set number of days of service.
• Salaried employees: are often credited as if they worked a standard 40-hour week, so a flat per-period amount is more common.

Frequently asked questions

How much PTO do I earn per hour worked?

Annual PTO hours ÷ annual basis hours. On a 2,080-hour year: 40 hours of PTO is 0.01923 per hour worked, 80 is 0.03846 (1 per 26), 120 is 0.05769, and 160 is 0.07692 (1 per 13).

How many PTO hours per paycheck is 80 hours a year?

If it accrues evenly per paycheck: about 1:32 weekly (1.5385), 3:05 biweekly (3.0769), 3:20 semimonthly (3.3333) and 6:40 monthly (6.6667). If it accrues per hour worked, it follows the hours on each timesheet instead.

How do I convert PTO days to hours?

Multiply by the length of your scheduled day. Ten 8-hour days is 80 hours; on 10-hour days, 80 hours covers 8 days.

Does overtime count toward PTO accrual?

It depends on the policy. Some accrue on every hour worked, some cap eligible hours at 40 a week or 80 a pay period. Your handbook or pay stub will say.

Is PTO accrual required by law?

US federal law doesn’t require paid vacation. Some states and cities require paid sick leave, and several use a minimum of one hour for every 30 worked. Caps, carryover and payout at separation vary by location.