90 days in 180 calculator

What does “90 days in 180” mean?

The 90/180 rule means you can stay a maximum of 90 days inside any rolling 180-day window. It is commonly used for short stays in regions like the Schengen Area, but similar logic appears in other visa-free programs.

The key word is rolling. It is not based on calendar months or a simple January-to-June period. For any date you choose, officials can look back 179 days plus that date (180 total) and count how many days you were present.

How to use this calculator

• Add each trip with a start and end date. Dates are counted inclusively.
• Repeat for all visits you want considered.
• Pick a “check date” (today, entry date, or exit date).
• Click Calculate 90/180 Status to see days used, days remaining, and compliance.

How the result is calculated

1) Build your 180-day window

If your check date is June 30, the calculator window runs from January 2 through June 30 (180 days total).

2) Count overlap days from your trips

Every day from each trip that falls inside that window is counted. If trips overlap, they are merged so no day is double-counted.

3) Compare with the 90-day limit

If your total is 90 or less, you are compliant. If it is more than 90, the calculator marks an overstay and estimates the next compliant date.

Practical tips to avoid mistakes

• Count arrival and departure days as days present unless official local rules say otherwise.
• Track trips continuously; missing one short weekend can push you over the limit.
• Check before booking, not after flying.
• Do not rely on monthly averages (like “15 days per month”); rolling windows are stricter.

Example scenarios

Light traveler

You visited 25 days in spring and 20 days in summer. If your check date includes both trips, your used total is 45 days, leaving 45 days available.

Frequent traveler

Multiple business trips can accumulate quickly. Even if each trip is short, the rolling window can still exceed 90 days. This is why a calculator is more reliable than rough mental math.

Important note

This tool is for planning and educational use. Immigration decisions are made by official authorities and can include rules not modeled here (special visas, bilateral agreements, residence permits, etc.). Always confirm with official government sources for your nationality and destination.