How to use the annual leave calculator
The formula
Entitled days = full-time entitlement × FTE fraction × (months worked ÷ 12). Entitled hours = entitled days × working hours per day.
How entitlement is usually set
In the UK, full-time workers are entitled to at least 5.6 weeks of paid holiday (28 days including bank holidays for a 5-day week), and many employers offer more. In the US there is no federal minimum for private employers, so PTO is set by company policy — enter your own full-time figure and this tool pro-rates it correctly for part-time and part-year staff.
Joiners and leavers
Use the months-worked field for someone who starts or leaves part-way through the leave year: 6 months worked means half of the (already pro-rated) annual figure.
Rounding
Many employers round part-days up or to the nearest half day for booking purposes. This calculator shows the exact figure so you can apply your own policy.
Example
25 full-time days at 0.5 FTE for a full year = 12.5 days — 100 hours of leave at 8 hours per day.
Frequently asked questions
How much leave does a 0.5 FTE employee get on a 25-day policy?
25 × 0.5 = 12.5 days for a full leave year.
How do I calculate leave for a mid-year starter?
Set months worked to the months remaining in the leave year (e.g. 6 for a half year) and the tool reduces the entitlement proportionally.
Should bank holidays be included?
That depends on your policy and country. Enter the full-time entitlement the way your policy states it — including or excluding public holidays — and the pro-rata maths works the same.
Why show hours as well as days?
Part-time staff often work shorter or variable days. Hours give a fairer, more precise entitlement than days when working patterns differ.
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