N-400 physical presence: the 913-day calculator
To naturalize, you need to have been physically present in the US for at least 30 months — 913 days — of the 5 years before you file Form N-400, or 548 days of 3 years if you’re married to a US citizen. The days you leave and come back count as days in the US.
N-400 physical presence calculator
The days you leave the US and come back count as days in the US.
Trips out of the US
The physical presence requirement
You need to have been physically present in the US for at least half of the period of continuous residence the law requires:
| Your route | Period before filing | Physical presence |
|---|---|---|
| A permanent resident for 5 years | 5 years | at least 913 days (30 months) |
| Married to and living with a US citizen | 3 years | at least 548 days (18 months) |
- Departure and return days count as days in the US.
- The green card alone isn’t proof. You show actual physical presence through documentation.
Continuous residence
Single long trips count against continuous residence, separately from the day count:
- an absence of more than 6 months but less than a year is presumed to break it — you can rebut that with evidence such as keeping your US job, family or home;
- an absence of a year or more breaks it, unless Form N-470 was approved.
See what trips mean for your status in green card trips abroad.
Worked example
You became a permanent resident on March 1, 2021 and haven’t left the US for long. Filing on March 1, 2026, the 5 years before hold 1,826 days — all in the US — so the 913-day requirement is met, and you’ve been a permanent resident for the whole period.
How FlySee counts it
FlySee doesn’t have a naturalization tracker yet. The calculator above counts as the USCIS Policy Manual does: every day in the 5 (or 3) years before filing is a day in the US except the days strictly between leaving and coming back. It flags absences of more than 6 months and of a year or more, and finds the earliest date you’d meet the day count with no more trips. FlySee’s Log and export list your trips with dates.