How many days in a fortnight?
- Always. Unlike a month (28 to 31 days) or a year (365 or 366), this unit never varies.
The word comes from Old English fēowertīene niht, "fourteen nights." Counting by nights was standard in Germanic and Celtic cultures. A "sennight" was seven nights. That one died out. The fourteen-night version stuck in Britain and its former colonies.
No astronomical event anchors it. It is purely cultural.
Fortnight vs biweekly
They mean the same thing: every two weeks. But they are not the same part of speech.
A fortnight is a noun. "I will return in a fortnight." Biweekly is an adjective or adverb. "We have a biweekly meeting."
In the US, "biweekly" is the standard term. In the UK, Australia, and New Zealand, "fortnightly" is common for recurring events.
One caution: "biweekly" sometimes confuses readers who interpret it as "twice a week" (semiweekly). Using the fourteen-night word avoids that ambiguity entirely.
How to count 14-day stretches between dates
Count the total days first. Divide by 14. Drop the remainder.
From 1 January to 1 March in a non-leap year: 59 days. 59 divided by 14 gives 4 complete stretches.
For a precise count including partial stretches, use a duration calculator. Enter the start and end dates, get the total days, then divide by 14.
Who uses "fortnight" in payroll and rent?
Rare in the US. Standard in:
United Kingdom - Payroll: many employers pay every two weeks. - Rent: some agreements charge per 14-day stretch, especially in student housing and short-term lets. - TV schedules: the BBC still uses "fortnightly" programme listings.
Australia and New Zealand - Wages: the most common pay schedule for salaried employees. - Centrelink (Australian welfare): payments go out every two weeks. - Rent: agreements frequently quote rent "per fortnight."
Other countries - India: the term appears in some official contexts (fortnightly reports in government). - Canada: used occasionally, but "biweekly" is more common.
If you see the word in US materials, it is likely a historical text, a British import, or payroll software configured for UK or Australian markets.
Payroll and rent calculations
Payroll
A 14-day pay schedule means 26 pay stretches per year (52 weeks divided by 2). Weekly gives 52. Semi-monthly gives 24. Monthly gives 12.
For employers, paying every two weeks means fewer payroll runs than weekly (saves processing time) and more frequent pay than monthly (better for employee cash flow).
Rent
A rent quoted per 14-day stretch needs multiplying by 26 to get the annual figure. Check the current Local Housing Allowance rates for your area on gov.uk; the Valuation Office Agency sets them each April. For Australian Centrelink payment rates, see servicesaustralia.gov.au; the Department of Social Services updates them twice yearly.
Using the duration calculator
The duration calculator gives you the exact number of days between any two dates. To convert that to 14-day stretches:
- Enter your start and end dates.
- Note the "total days" result.
- Divide by 14 manually.
Example output from the calculator: - Start: 1 April 2026 - End: 1 July 2026 - Days: 91 - 14-day stretches: 91 divided by 14 gives 6 complete stretches plus 7 days.
The days between dates calculator also provides the total days you need.
How many 14-day stretches in a month, quarter, or year?
| Span | Days | 14-day stretches |
|---|---|---|
| 1 month (30 days) | 30 | 2 |
| 1 quarter (90 days) | 90 | 6 |
| 6 months (180 days) | 180 | 12 |
| 1 year (365 days) | 365 | 26 |
| 1 leap year (366 days) | 366 | 26 |
Figures are rounded down to complete stretches. A 30-day month contains two full 14-day stretches, not 2.14. A 365-day year contains 26 full stretches.
Checklist: - [ ] Confirm the term is understood by your audience (UK/Australia yes, US no) - [ ] For payroll: 26 stretches per year, not 24 - [ ] For rent: multiply the 14-day amount by 26 for the annual total - [ ] For date calculations: always count days first, then divide by 14