Calculating my 90 Schengen days precisely [duplicate]

I am a US citizen and know the 90-day allotted rule. But this time I need clarification. I am entering France on May 18th and had planned on departing Spain on August 16th - exactly 90 days.
But I have booked a repositioning cruise that departs from Lisbon on August 26th. So I think, or at least hope, I could depart Spain for the UK on August 14th or 15th and would still be able to return to Lisbon for 1 day on the 26th and still be within my 90 days? Sure hope someone can answer this question for me before I confirm my cruise!

Added from a now deleted answer:
I have rearranged my departure from Spain to the UK to give myself a 4-day buffer before I would reach my 90-day limit in the Schengen. I will fly into Lisbon the morning of the 26th of August and the cruise departs (for the States) at 11:00 p.m. that evening.

Best Answer

Using the Schengen calculator https://ec.europa.eu/assets/home/visa-calculator/calculator.htm?lang=en entering on 18th May and leaving on 14th August will allow you to renter on 26th for one day within the 90/180 day rule.

Bear in mind that ‘For one day’ means exactly that - you will need to enter and leave on the same day, and before 23:59. You must make sure you receive entry and exit stamps. Since you do not have any room for error if there are any delays to your travel plans, you should consider how you can spend a little less time in the Schengen zone to give yourself more of a buffer. For example, arriving in Schengen a little later, leaving for the UK a day or so earlier.

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How do I count my 90 days Schengen visa?

You may only visit the Schengen Area for a total of 90 days within 180 days. The 180 days are counted backwards from your latest entry or exit date. This means it's counted from the first day you entered (if you have not left yet) or the final day you visited the Schengen Area (the date of exit).

How are Schengen dates calculated?

The 180-day period keeps rolling. Therefore, anytime you wish to enter the Schengen, you just have to count backwards the last 180 days, and see if you have been present in the Schengen for more than 90 days throughout that period.

How does the Schengen 90 days in 180 work?

You can stay 90 days in any 180-day period within the Schengen area. calculated individually for each of these states. For instance, after a 90-day stay in the Schengen area, the person can immediately travel to Croatia and stay for another 90 days there. The 180-day reference period is not fixed.

What happens if you exceed 90 days in Schengen?

The Schengen law states that you can't stay in the Area for more than 90 days. If you do, you're subject to a fine and possibly deportation and being banned from re-entering the Schengen Area. How that rule is enforced, though, varies greatly from one country to another.

How to use the Ninety 180 - the 90 / 180 days Schengen stay calculator.

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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