TL;DR — Key Takeaways
- →90 days in any 180-day period is a rolling window.
- →Generic calculators and the free Domicyle tool check dates you enter now. They do not keep the year.
- →A live tracker stores trips, updates the window, and can alert you before you are over.
- →No consumer tracker is the EU Entry/Exit System.
Short answer
Use a one-off calculator when you have one itinerary to check. Use a tracker with saved history when you add trips all year.
What each option does
| Option | Saves history | Alerts | What-if against trips already logged |
|---|---|---|---|
| Generic Schengen calculator site | No | No | Only the dates on screen |
| Spreadsheet formula | Yes, if you maintain it | Only if you build it | Manual |
| Domicyle free Schengen calculator | No | No | The dates you enter in that session |
| Domicyle Premium Residency Tracker | Yes | Yes, with Domicyle Alerts | Yes |
Start with the free Schengen calculator. Move to the Residency Tracker and alerts when the same window has to survive the next booking.
Educational planning only — not immigration advice.