Substantial Presence Test Calculator
This calculator applies the 2026 Substantial Presence Test: days in 2026, 2025, and 2024. It does not decide residency when an exception, a treaty, or student exempt-individual rules may apply.
Questions students ask
What does the weighted total mean?
All of the current-year countable days, one-third of the prior year, and one-sixth of the year before that. Both the 31-day and 183-day conditions have to appear met.
I am on F-1. Why is there no yes or no?
Student days may be excluded, but only after exempt-individual eligibility and the year limit are checked. This page will not make that decision for you.
Does meeting 183 days make me a resident?
Not by itself. A closer connection, a treaty, or another exception can still change residency.