pi razy oko

Literally: Pi times the eye

Example: “Remont będzie kosztował, pi razy oko, dwadzieścia tysięcy.” — The renovation will cost twenty thousand, as a ballpark figure.

English equivalent: A ballpark figure

Origin: "Pi times the eye": a jocular way of saying roughly. Na oko (by eye) already means at a rough estimate, and multiplying it by pi, the number every schoolchild knows only approximately, makes the guesswork comic. A variant is pi razy drzwi (pi times the door). No source documents its origin or first use.