DayWindow Schengen Calculator: Count your 90 days in 180 and the date you must leave

Counting the Schengen 90/180 rule by hand is where people go wrong, and the official tools do not always help. The EU's own EES calculator says on its page that its figure "does NOT reflect any time spent in the Schengen area that began before 10 April 2026" — so older trips are invisible to it while they still count against you. So this is the plain version. Put in the trips you have already taken and it shows the days used, the days left, the exact date you have to be out by, and the day each stay comes back to you. Free, no sign-up, no adverts, no cookies. The whole calculation happens in your browser, so nothing is sent anywhere. If you find an edge case where it disagrees with your stamps, tell me and I will fix it.