This page converts fortnights into days using the factor 14, and shows the reverse figure alongside it. Both units measure time, which is why one number does the whole job.
Fourteen days, still the standard pay and rent period in the UK and Australia. Exactly 86,400 seconds by convention (leap seconds excepted).
Months and years are not fixed. This page uses the average Gregorian month of 30.44 days and the Julian year of 365.25 days, which is right for durations and wrong for calendars: three months from 31 January is not 91.31 days in any useful sense. Use a date calculator for calendar arithmetic. Below the calculator there is a step table for the values people look up most, and a second table putting real time figures into days so the number you get has something to be compared against.
The formula
fortnights- The amount you are converting, in fortnights
14- The exact number of days in one fortnight
days- The converted result
How it works, step by step
- Enter the value in fortnights.
- It is multiplied by 14, the exact factor between the two units.
- The answer is shown in days, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A mortgage term: 626 fn in days
Take a mortgage term, roughly 626 fn. The conversion is a single multiplication — 626 × 14 — giving 8764 d. Because the relationship is proportional, doubling the input doubles the answer to 17,528 d.
A working day: 0.0238 fn in days
Take a working day, roughly 0.0238 fn. The conversion is a single multiplication — 0.0238 × 14 — giving 0.3332 d. Because the relationship is proportional, doubling the input doubles the answer to 0.6664 d.
How to read your score
Frequently asked questions
How many days are in one fortnight?
Exactly 14. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert fortnights to days?
days = fortnights × 14. Reversed, fortnights = days ÷ 14, which is the same as multiplying by 0.0714285714286.
Which is the bigger unit, the fortnight or the day?
The fortnight. One fortnight equals 14 days.
What does this quantity actually measure?
Both units measure time. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a fortnight?
Fourteen days, still the standard pay and rent period in the UK and Australia.
What is a day?
Exactly 86,400 seconds by convention (leap seconds excepted).
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Fortnights to days reference tables
| Fortnights | Days |
|---|---|
| 0.5 fn | 7 d |
| 1 fn | 14 d |
| 2 fn | 28 d |
| 3 fn | 42 d |
| 5 fn | 70 d |
| 10 fn | 140 d |
| 20 fn | 280 d |
| 25 fn | 350 d |
| 50 fn | 700 d |
| 75 fn | 1050 d |
| 100 fn | 1400 d |
| 250 fn | 3500 d |
| 500 fn | 7000 d |
| 1000 fn | 14,000 d |
| 5000 fn | 70,000 d |
Exact factor: 1 fortnight = 14 days.
| Quantity | fn | d |
|---|---|---|
| A camera flash | 8.267e-10 fn | 1.157e-08 d |
| A heartbeat | 7.085e-07 fn | 9.919e-06 d |
| A pop song | 0.0001736 fn | 0.002431 d |
| A working day | 0.02381 fn | 0.3333 d |
| A pregnancy | 20 fn | 280 d |
| A mortgage term | 626.1 fn | 8766 d |
Published reference values, converted with the same factor this page uses.