DayWindow
What the official calculator misses
There are two official Schengen calculators, they answer different questions, and one of them currently warns you twice about its own answer. Both warnings are quoted below, in full.
If you are trying to work out how long you may stay, the sensible instinct is to use the official tool rather than a stranger's. That instinct is right. It is still worth knowing exactly what each one counts, because one of them is missing part of your history on purpose.
The two official tools
The European Commission's short-stay calculator is the arithmetic tool. You type in your own past trips and it works out the 90/180 sum. It knows nothing about you; it only knows what you type. Its own user's guide says:
“The calculator is a helping tool only; it does not constitute a right to stay for a period resulting from its calculation.”
Read on the Commission's calculator page, 11 August 2026.
The EES online tool is the newer one, tied to the Entry/Exit System. It does not ask you for your trips; it looks up what the border system recorded, from your passport number. That sounds better, and for recent travel it is. The catch is what the record contains.
What the EES tool leaves out, in its own words
On the EU's own page for that tool, two warnings sit above the form. Neither is hidden and neither is ours to paraphrase, so here they are exactly as published:
Warning one
“Please note that the remaining authorised stay does NOT reflect any time spent in the Schengen area that began before 10 April 2026, regardless of whether the visit ended before or continued after that date.”
Warning two
“Please also note that until 6 October 2026 included, the ‘OK’ answer may be unreliable for holders of a single or double entry-visa who have already used any of the permitted entries in the period between 12 October 2025 and 9 April 2026 when the use of these visas was not recorded in the Entry/Exit System.”
Both read on travel-europe.europa.eu, 11 August 2026. The second one expires on 6 October 2026; the first has no end date attached.
What that means for a real traveller
Nothing here says the tool is broken. It is doing exactly what it says: reporting what the Entry/Exit System holds, and that system did not hold everything before 10 April 2026.
But if part of your travel happened before that date, those days are still real to a border officer working from your passport stamps, and they are simply absent from the EES answer. A number that leaves out some of your history reads as more room than you have.
The practical version: if all your travel is recent, the official EES answer is the one to trust. If any of it began before 10 April 2026, that answer is not the whole picture and you need to count those days yourself.
Counting the older days yourself
That is arithmetic, not magic, and it is the same sum the Commission's calculator does: count backwards 180 days from the day being checked and add up the days inside. The method, step by step, is in how to count the 180 days.
The calculator on this site counts every trip you give it, whenever it happened, and walks forward to the last day you could stay. It is free, there is no sign-up, and nothing you type leaves your own browser. It is a helping tool too: the officer at the border decides.