Irregular Hours Holiday Calculator
Work out holiday for zero hours, casual and part-year workers at 12.07% of the hours they work. Add pay to see rolled-up holiday pay. No signup needed.
Work out holiday earned at 12.07%
Enter the hours worked in each pay period, or one total. Pay and usual hours per day are optional.
Pay period 1
Pay period 2
Add this to see the holiday as days as well as hours.
Enter hours worked to see the holiday earned.
For irregular-hours and part-year workers in Great Britain in leave years starting on or after 1 April 2024. General guidance, not legal advice. See GOV.UK holiday entitlement.
Let Leavely keep the running total
Record hours worked each pay period and Leavely keeps each person's holiday balance at 12.07% of the hours they have worked in the leave year.
The 12.07% rule for irregular hours and part-year workers
For leave years starting on or after 1 April 2024, two groups of workers build up holiday as a share of the hours they actually work:
- Irregular-hours workers: people whose paid hours in each pay period are wholly or mostly variable, such as zero hours and many casual workers.
- Part-year workers: people who work only part of the year and have periods of at least a week when they do not work and are not paid.
They accrue holiday at 12.07% of the hours worked in each pay period. The holiday is added at the end of each pay period.
Where 12.07% comes from
Workers are entitled to 5.6 weeks of statutory holiday a year. That leaves 46.4 weeks of work in a 52-week year. 5.6 ÷ 46.4 = 0.1207, or 12.07%. Because the 5.6 weeks already include bank holidays, irregular-hours and part-year workers do not get a separate bank holiday allowance on top.
For example, someone who works 62.5 hours in a monthly pay period earns 62.5 × 12.07% = 7.54 hours of holiday for that month. If they usually work 7.5-hour days, that is just over 1 day.
Rolled-up holiday pay
For these workers, employers may choose to pay rolled-up holiday pay instead of paying holiday when it is taken. You pay an extra 12.07% of the worker's pay for each pay period, and show it separately on the payslip. The worker still takes time off; it is just paid in advance. Read more in our holiday pay calculation guide.
Zero hours and casual workers
Zero hours workers have the same right to 5.6 weeks' statutory holiday as anyone else. The 12.07% method just makes it easier to work out when hours change from week to week. Our zero hour contract holiday guide covers it in more detail.
Frequently asked questions
Who is an irregular-hours worker?
Someone whose paid hours in each pay period are wholly or mostly variable under their contract. Zero hours and many casual workers fall into this group.
Who is a part-year worker?
Someone who works only part of the year and, under their contract, has periods of at least a week when they do not work and are not paid. Term-time staff can fall into this group.
Why 12.07%?
Statutory holiday is 5.6 weeks a year. That leaves 46.4 weeks of work (52 minus 5.6). 5.6 divided by 46.4 is 12.07%, so a worker earns 12.07% of the hours they work as holiday.
When does the 12.07% rule apply?
To irregular-hours and part-year workers for leave years starting on or after 1 April 2024. Holiday accrues at the end of each pay period, at 12.07% of the hours actually worked in that period.
Do zero hours workers get bank holidays on top?
No. The 12.07% accrual is based on the full 5.6 weeks of statutory holiday, which already includes bank holidays. There is no separate bank holiday allowance on top.
What is rolled-up holiday pay?
Instead of paying holiday when it is taken, employers can pay irregular-hours and part-year workers an extra 12.07% of their pay for each pay period. It must be shown separately on the payslip.
How do I show the holiday in days?
Divide the holiday hours by the hours the person usually works in a day. Enter their usual day length in the calculator and it does this for you.
Does this calculator work out holiday pay for time taken off?
No. It works out holiday earned in hours (and days), and rolled-up holiday pay if you enter pay. Holiday pay for leave taken is based on average pay, which depends on each person’s earnings.
Sources and scope: checked 24 September 2026
This tool applies the 12.07% accrual rate to the hours you enter, for irregular-hours and part-year workers in Great Britain in leave years starting on or after 1 April 2024. It does not decide whether someone is in either group, and does not calculate holiday pay for leave taken. Your own policy may be more generous.
General information only, not legal advice.
Track 12.07% holiday automatically
Record hours worked each pay period and Leavely keeps each person's holiday balance up to date, in hours or days. Try it free for 14 days.