Pro-rata holiday calculator
Started partway through the year? Find out how much of your annual holiday allowance you get, and how much you have earned so far.
How the proration works
Your first year’s allowance is your annual allowance multiplied by the share of the year left from your start date. That share counts the rest of your first month by days, plus every full month after it, out of 12. Starting on 16 March with 25 days a year: 16 of March’s 31 days remain (0.52 of a month), plus 9 full months, gives 9.52 months, and 25 × 9.52 ÷ 12 ≈ 19.8 days.
Results are rounded down to a tenth of a day, so the calculator never promises holiday you haven’t earned. Some employers round to the nearest half or whole day instead — your contract has the final word.
Gradual or immediate accrual
With gradual accrual, one twelfth of your allowance is earned at the end of each month; with immediate accrual, the whole year’s (prorated) allowance is available from day one. Both reach the same total by 31 December. Read more in pro-rata holiday allowance explained.
Keep track all year
Clockflux uses exactly this calculation. Enter your allowance and start date once, mark your days off in the calendar, and it keeps your earned, used and available days up to date — see holiday allowance.