How to use it
- The next Friday the 13th and the days until it are shown as soon as the page opens.
- Enter a year to list all its Friday the 13ths; step through the years with the arrows.
- Set a range (up to 100 years) for a year-by-year table with the count and dates per year.
- Copy the summary or the link.
Example
On Monday 19 October 2026 the next Friday the 13th is 13 November 2026, 25 days away; the previous one was 13 March 2026. The year 2026 has three because February, March and November 2026 all begin on a Sunday – February and March can only pair up like this in a common year, when both months start on the same weekday.
How the dates are found
For each month the weekday of the 13th is computed from the calendar; a month qualifies when that day is a Friday, which is the same as the month starting on a Sunday. Scanning the twelve months of a year gives the list; the “next” and “previous” results scan forward and backward from today.
Friday the 13th in month M ⇔ weekday(1st of M) = Sunday
per year: 1 ≤ count ≤ 3; per 400 years: 688 (171 years with 1, 170 with 2, 59 with 3)Why at least one and at most three: the first days of the twelve months fall on all seven weekdays within any year, so some month starts on a Sunday – and the pattern of month lengths allows at most three such months (February, March and November in common years; January, April and July in leap years).
The Gregorian calendar repeats exactly every 400 years (146,097 days = 20,871 weeks), which is why the count of 688 is exact; the 13th lands on a Friday 688 times, on a Thursday or Saturday 684 times each, and on the remaining weekdays 685–687 times. The tool covers 1583–9999 in the proleptic Gregorian calendar.
Sources: Friday the 13th – occurrence and statistics, Gregorian calendar – the 400-year cycle.
Questions
- When is the next Friday the 13th?
- The result panel always shows the next one from today with a day count. After 13 November 2026 the next ones are 13 August 2027 and 13 October 2028.
- How many Friday the 13ths are there in a year?
- One, two or three – never zero and never four. Years with three are the rarest (59 of every 400); the most recent were 2015 and 2026, the next is 2037.
- Can two Friday the 13ths be only a month apart?
- Yes: in a common year February and March start on the same weekday, so a Friday 13 February is always followed by Friday 13 March, 28 days later – as in 2026.
- Is Friday the 13th really unlucky?
- There is no statistical evidence that it is; the superstition combines older beliefs about Fridays and the number 13. The calendar simply makes the date unavoidable at least once a year.