A fortnight is 14 days - two weeks exactly. Commonly used for UK and Australian payroll, this fortnight calculator measures timespans in 2-week chunks.
Fortnight calculator
Using the calculator
Pick your start and end dates. The result shows fortnights to one decimal place, plus equivalent days, weeks, and years. Swap dates and the calculator handles the negative correctly.
Why fortnights?
- Biweekly pay: The most common pay period in many countries
- Sprint cycles: Two-week sprints are the agile default
- Medication schedules: Many prescriptions refill biweekly
- Rent cycles: Some leases use fortnightly payments
