The Schengen 90/180 rule means you can stay up to 90 days in any rolling 180-day window across all Schengen countries combined.
To calculate correctly, list all your past Schengen trips, count every day spent in the area, and evaluate them against the 180-day period ending on your planned entry date.
The rule is rolling — not calendar-based. That means the 180-day window shifts with each new day, so days that fall outside the window no longer count against your quota.
