Postal code lookup

Check a postal code against the real format of 26 countries and read what it means. For France the first two digits give the department — all 101 — and for Spain the province, all 52; elsewhere you get the structure, the validity check and the major cities we hold. Not a postal database, and it says so.

The questions no reference answers: what a meeting is costing while it runs, how many hours a commute has taken out of a year, how much detergent a load actually needs, and a few that exist for the pleasure of knowing — how many popcorn kernels would fill a room, what a hamster generates.

Quoting the playful ones as if they were measurements. A room filled with popcorn and a salary counted in bathroom breaks are arithmetic done honestly on premises chosen for fun; the number that comes out is exactly as solid as the assumption you fed it, which is the joke.

They sit next to each other but answer different questions: Postal code by city is the one to open when you need it to type a city and get its postal code or code range, across 26 countries — Paris 75001–75020, Berlin 10115–14199, São Paulo 01000-000 – 05999-999. A curated list of major cities, not every municipality: when a town is missing it is our list that is short, and the tool says which. Pick whichever matches what you're starting from — both are free.

Clothing size converter is the closest one after this: Tops, bottoms and shirt collars converted separately between FR, IT, DE, UK and US — each with the body measurement EN 13402 makes its primary dimension.

Commute Life Wasted Calculator and Dew Point Calculator — they come up in the same task often enough to be worth a second tab.

The household ones follow the figure printed on the packet or the manufacturer's chart, which is why a detergent dose or a nappy size may not match another brand's. The rest state their assumptions on the page, because assumptions are the whole content of the answer.