PTO accrual calculator

What is a PTO accrual calculator?

A PTO (paid time off) accrual calculator tells you how much vacation you have actually earned so far, how much you will earn over a full year, and what that balance is worth in days off. Most employers do not hand you a year’s vacation on day one — you accrue it a little at a time, gaining a fixed number of hours every pay period, week, month, or year. Because the hours trickle in and get spent unevenly, it is easy to lose track of where your balance really stands.

This calculator takes your accrual rate, the period that rate applies to, your pay frequency, whatever you had banked at the start, the hours you have already taken, and the number of periods you have worked, and returns three numbers: your current PTO balance, your projected annual accrual, and your balance expressed in days.

How does the calculator work?

You provide:

1. Accrual rate — the hours of PTO you earn in one period.
2. Accrual period — whether that rate is per pay period, per week, per month, or per year.
3. Pay frequency — weekly, biweekly, semimonthly, or monthly. This is what turns “per pay period” into a number of periods per year.
4. Hours already accrued — your starting balance (often a carryover from last year, or 0 for a new plan year).
5. Hours used — the PTO you have already taken.
6. Periods worked so far — how many accrual periods have elapsed.

The calculator first annualizes your rate, then works out what you have banked and what you have left.

Periods per year

The accrual period decides how many times a year the rate is applied:

When the rate is per pay period, the pay frequency supplies the count:

Note that biweekly (26 paychecks) and semimonthly (24 paychecks) are not the same thing — a common source of error when people estimate their accrual by hand.

Formulas

The hours you have banked so far are the rate multiplied by the number of periods that have elapsed:

$$\text{Accrued so far} = \text{Accrual rate} \times \text{Periods worked}$$

Your current balance adds that to whatever you started with and subtracts what you have taken:

$$\text{Current balance} = \text{Starting balance} + \text{Accrued so far} - \text{Hours used}$$

Over a full year, the same rate applied every period gives your projected annual accrual:

$$\text{Projected annual accrual} = \text{Accrual rate} \times \text{Periods per year}$$

Finally, hours are converted into days. This calculator assumes a standard 8-hour workday:

$$\text{Balance in days} = \frac{\text{Current balance}}{8}$$

Examples

Example 1: Biweekly accrual

You earn 4 hours of PTO per pay period, you are paid biweekly (26 pay periods a year), you started the year with a balance of 0, you have already taken 16 hours off, and 13 pay periods have gone by.

First, the hours banked so far:

$$\text{Accrued so far} = 4 \times 13 = 52$$

Subtract the time you have taken:

$$\text{Current balance} = 0 + 52 - 16 = 36$$

Across a full year the same rate keeps applying:

$$\text{Projected annual accrual} = 4 \times 26 = 104$$

And in days off:

$$\text{Balance in days} = \frac{36}{8} = 4.5$$

So you have 36 hours (4.5 days) available right now, and you are on track for 104 hours of PTO this year.

Example 2: Monthly accrual

Now suppose your plan grants 8 hours per month, you started at 0, you have taken nothing, and 6 months have elapsed:

$$\text{Accrued so far} = 8 \times 6 = 48$$ $$\text{Current balance} = 0 + 48 - 0 = 48$$ $$\text{Projected annual accrual} = 8 \times 12 = 96$$ $$\text{Balance in days} = \frac{48}{8} = 6$$

Half a year in, you have banked 48 hours (6 days) out of a projected 96 hours for the year.

Frequently asked questions

Why does my balance in days assume 8 hours?

An 8-hour day is the standard full-time convention in most PTO policies, so the calculator divides your hour balance by 8. If you work a different schedule — a 7.5-hour day, or four 10-hour shifts a week — divide your hour balance by your daily hours instead. The hours figure is always the exact one; the days figure is just a convenience conversion.

What accrual rate should I enter?

Use the figure from your policy document or your pay stub, exactly as it is expressed. If the policy says “3.08 hours per pay period,” enter 3.08 and select per pay period. If it says “10 days per year,” multiply by your workday length (10 × 8 = 80 hours), enter 80, and select per year.

Why does pay frequency matter if my rate is per month?

It does not. Pay frequency is only used when your accrual rate is expressed per pay period, because that is the only case where the calculator has to look up how many pay periods fall in a year. A per-week, per-month, or per-year rate annualizes on its own (52, 12, or 1).

Can my balance go negative?

Yes — the calculator will show a negative balance if you have taken more hours than you have earned. Some employers allow this (borrowing against future accrual), and some do not. A negative result simply tells you that you are currently over-drawn against your accrued time.

Does this account for accrual caps or carryover limits?

No. Many policies cap the balance you may bank, or limit how many hours roll into the next year. This calculator computes the raw accrual, so if your plan has a cap, compare the result against it — if the projected balance exceeds your cap, you will stop accruing once you hit the ceiling.

How do I convert my PTO to a cash value?

Multiply your hour balance by your hourly rate. If you only know your annual salary, the salary to hourly calculator converts it for you. Bear in mind that PTO payout on termination is governed by local law and your contract — not every jurisdiction requires it.

If you also work extra shifts, the overtime calculator works out what those hours are worth, and the annual income calculator shows how it all adds up over a year.