Physical presence calculator

What is the N-400 physical presence requirement?

Under INA 316(a), the general naturalization path, you must have been physically present in the United States for at least 30 months out of the 5 years before you file — USCIS states that directly as at least 913 days.

"Applicants for naturalization under INA 316(a) are required to demonstrate physical presence in the United States for at least 30 months (at least 913 days) before filing the application."

This is separate from continuous residence, which asks a different question: whether any single trip was long enough to break your residency clock. You can meet physical presence and still fail continuous residence, or the reverse. Our continuous residence page covers that rule.

How many days can you spend outside the United States?

Over a 5-year statutory period, you have 1,826 or 1,827 calendar days total (accounting for a leap year), and 913 of them must be spent inside the United States. That leaves roughly 913 or 914 days available for travel abroad, spread across the whole 5-year window — not per trip, and not per year.

A single long trip can still cost you eligibility even if your running total of days abroad stays under that number, because a trip of more than 180 days also puts continuous residence at risk. The two rules interact. This calculator checks both at once.

Does the day you fly out count as a day present or a day absent?

USCIS counts it as a day present. The same is true of the day you return. Only the days strictly between departure and return count against your physical presence total.

"USCIS will count the day that an applicant departs from the United States and the day he or she returns as days of physical presence within the United States for naturalization purposes."

So a trip that departs on a Monday and returns the following Monday is 6 days absent, not 7 — both Mondays count as days present. This is the single most common mistake in a hand-built travel spreadsheet: subtracting the return date from the departure date directly overcounts every trip by two days.

How do you calculate your physical presence days?

1. List every trip abroad in the 5 years before your expected filing date, with exact departure and return dates.
2. For each trip, subtract the departure date from the return date, then subtract 1 more day — that is the number of days absent for that trip.
3. Add up the days absent across every trip in the window.
4. Subtract that total from the number of calendar days in your 5-year window (1,826 or 1,827).
5. Compare the result to 913. If it is 913 or more, you meet physical presence.

Doing this by hand across a full green card holder's travel history is where the arithmetic mistakes creep in. The calculator on our home page does this automatically: enter your green card date and each trip, and it applies the day-counting rule above to every trip and totals the result.

Is the requirement different if you're applying as the spouse of a US citizen?

Yes. Under INA 319(a), the physical presence requirement is 18 months, not 30. USCIS states this figure in months and has not published a day count for it. 548 days — half of the 3-year, 1,095 day continuous residence period, rounded up — is our own arithmetic, not a number USCIS has published, and we label it as derived wherever it appears on this site.

The 319(a) path also requires 3 years of continuous residence and 3 years married to, and living in marital union with, the US citizen spouse before filing.

Read the spouse-of-a-US-citizen rules on uscis.gov (Policy Manual, Vol. 12, Part G, Chapter 1)