Hausnummer lesen — nur zum Spaß

How to reduce

Add digits until one remains, e.g. 1204 → 7. Some keep 11 and 22; some always reduce. There is no official rule.

Culture clashes

4 sounds like “death” in several East Asian languages; 13 is the Western building superstition; 8 sounds like “wealth” in Mandarin. The same digit flips meaning by culture.

Floors and blocks

“High floors are lucky” mixes elevators, views, and price. Light, noise, and upkeep matter more than the numeral.

Do not use for

Timing a purchase or judging health. Contracts and inspections first.

Playful calculator