Prorated Leave Calculator

How to use this calculator

Enter the leave-year boundaries, employment dates and full-year allowance. Use one unit throughout, such as days or hours. Apply a work-pattern factor only if the allowance is not already adjusted.

Both interval endpoints count. Only dates shared by employment and the leave year contribute. The denominator is the actual leave-year length, including leap days. Rounding applies once, after the day fraction and work-pattern factor.

A worked example

July 1–December 31, 2026 contains 184 dates. A 25-day allowance across a 365-day leave year gives about 12.6027 days before rounding, or 13 days when rounded up to the next half-day.

Does this determine my legal holiday entitlement?

No. It applies the allowance, factor and rounding policy you enter. Employer and jurisdiction rules may use different methods. It does not project a running balance or scheduled accrual.

Further reading: Source workflow and conventions. Your entered rules determine this result.

Which calendar and years are supported?

Use Gregorian dates from 1900 through 2100, with results inside that range. Most daily plans are limited to 366 dates; academic terms and sprint plans allow up to 731. Forms limit the number of entries to keep calculations responsive. Holidays and policy rules come from your inputs. Date-only plans ignore DST; tools with time-zone inputs use the browser's time-zone data and explicitly resolve repeated times. Calendar exports preserve date-only markers or exact timed events as appropriate. Calculations run only when requested, without background polling.

What happens to my dates?

Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.