Why Is Friday the 13th Considered Unlucky?

For millions of people, Friday the 13th stirs a flicker of unease. Some avoid flights, big purchases, or important decisions on that day. Where does this deeply rooted superstition come from?

Two Unlucky Symbols Combined

The dread of Friday the 13th merges two older superstitions: the fear of the number 13 and the fear of Fridays. Each has its own long history, and their combination is especially potent.

Why 13 Is Feared

The number 13 has been considered unlucky in Western culture for centuries. One common explanation is the Last Supper, at which thirteen people were present before Jesus's crucifixion — Judas, the betrayer, being the thirteenth guest.

The fear is so widespread it has a name: triskaidekaphobia. Many buildings skip the 13th floor, and some airlines omit row 13.

Why Friday Is Feared

Friday also carried negative associations in Christian tradition — it was the day of the Crucifixion. In older folklore, Friday was considered an unlucky day to begin a journey, start a new job, or get married.

When They Combined

Curiously, the *specific* combination of Friday and the 13th seems relatively modern. It gained widespread attention in the 19th and early 20th centuries. A popular 1907 novel titled *Friday, the Thirteenth* helped cement the idea in public consciousness, and 20th-century horror films sealed its reputation.

How Often Does It Happen?

Friday the 13th occurs at least once every year and at most three times. Due to the structure of the Gregorian calendar, the 13th of the month is actually *slightly more likely* to fall on a Friday than any other day of the week — a quirky statistical fact.

A Harmless Quirk

There's no evidence that Friday the 13th brings any real misfortune. Studies on accidents and hospital visits show no meaningful increase. Like the zodiac and lucky charms, it endures because superstition is part of human nature — a shared story that gives a mundane date a little shiver of meaning.