How each rule counts your days
Five rules, five different definitions of a day. Each page below has the live calculator for that rule, the mistakes that actually cost people money, and the primary source it is checked against.
Short-stay and visa rules
How long you can be somewhere on a passport alone, and how that gets enforced at the border.
Schengen 90/180 calculator
Ninety days in any rolling 180-day period, across all 29 Schengen countries combined. The window moves with you: every day, the question is how many of the previous 180 days you spent inside the area. There is no annual reset and no per-country allowance.
EES
Since 10 April 2026 the EU records entries and exits biometrically instead of stamping passports, and computes the 90/180 rule itself. The rule did not change. What changed is that the counting is now done for you, accurately, at the moment you reach the border.
Tax residency rules
The day counts that decide which country can tax you, and on which of its own calendars.
FEIE 330-day physical presence test calculator
US citizens and residents can exclude a large amount of foreign earned income if they are physically present in a foreign country for 330 full days in any 12 consecutive months. It is the highest-stakes day count there is: missing it by a single day can cost the entire exclusion.
The 183-day rule
Most countries presume you are tax resident once you spend 183 days there within their tax year. The number is nearly universal; the calendar it is measured on is not, and that is where people get caught.
UK Statutory Residence Test
The SRT is not a single day count. It is three tests applied in order: the automatic overseas tests, the automatic UK tests, and, for everything in between, the sufficient ties test, where the day threshold moves according to how many ties you have to the UK.
One trip history, every rule
The same trips are measured differently by each rule above — Schengen counts your arrival day, the US 330-day test does not. Driftly runs all five against one trip history instead of five separate spreadsheets.
Track them all — free