How to Calculate PTO and Holiday Accrual

If your employer says you “accrue” paid time off, it means you earn your vacation gradually as you work rather than receiving it all at once. That raises a practical question: how much have you actually banked right now? This guide breaks down PTO accrual into a simple rate you can apply to any number of hours worked.

Why it matters

Knowing your accrual rate helps you plan time off without nasty surprises. It tells you when you will have enough hours for a long weekend or a full week away, and it lets you check that your balance on payday matches what you have earned. For anyone paid hourly or working an irregular schedule, it is the only reliable way to track vacation.

The formula, in plain words

Accrual is just a ratio: the PTO you earn in a year divided by the hours you work in a year. Build it in three steps:

• Annual PTO hours = PTO days × hours per workday
• Annual hours worked = hours per week × 52
• Accrual rate = annual PTO hours ÷ annual hours worked

The result is the amount of PTO you earn for every single hour you work — a small decimal that you can multiply by any stretch of time.

A step-by-step example

Suppose you get 20 days of PTO, work 8-hour days, and put in 40 hours a week.

1. Annual PTO hours: 20 × 8 = 160 hours.
2. Annual hours worked: 40 × 52 = 2,080 hours.
3. Accrual rate: 160 ÷ 2,080 = 0.0769 hours of PTO per hour worked.
4. Per two-week pay period (80 hours): 0.0769 × 80 ≈ 6.15 hours of PTO — a little over three quarters of a day each pay period.

To check a mid-year balance, multiply the rate by the hours you have worked so far. After 520 hours, that is 0.0769 × 520 ≈ 40 hours — five full days at an 8-hour day.

Common mistakes to avoid

• Mixing up days and hours. Decide on one unit and stay consistent; convert by multiplying or dividing by your hours-per-day.
• Assuming everyone accrues the same way. Some employers grant PTO up front, others accrue per pay period or per month, and many set caps or waiting periods.
• Forgetting part-time schedules. Fewer hours worked means a different annual figure, so re-run the math with your real weekly hours.
• Ignoring carryover and payout rules. Accruing PTO and being able to keep or cash it out are separate questions governed by policy and local law.

Try it yourself

Instead of working the decimals by hand, enter your entitlement and schedule into the PTO accrual calculator. It shows your accrual rate, what you earn per week and pay period, and how many hours — and days — you have accrued so far.