Home/USA/N400 Citizenship Physical Presence Calculator
USCIS / INA §§316 & 319 / 8 CFR Part 316

N-400 Physical Presence & Continuous Residence Calculator

Calculate qualifying physical-presence days for the 913-day (5-Year) or 548-day (3-Year Spouse) naturalization rule and review foreign trip disruptions.

Naturalization Route & Travel Log

Date shown on your Permanent Resident Card
Target date to submit your N-400 application
Foreign Trips Outside U.S. (During Lookback)

* USCIS Counting Rule: The day you depart and the day you return count as days physically present in the USA. Only full days strictly between departure and return are subtracted.

Statutory Naturalization Framework (INA §316 / §319)

Naturalization requires satisfying two distinct time tests: Physical Presence (counting cumulative days on U.S. soil) and Continuous Residence (maintaining uninterrupted domestic domicile).

RequirementStandard 5-Year Route3-Year Spouse Route
Physical Presence Required30 Months / 913 Days18 Months / 548 Days
Continuous Residence5 Continuous Years3 Continuous Years
Trips < 6 MonthsGenerally safe from breaking continuity; subtracts from physical presence
Trips 6 to 12 MonthsRebuttable presumption of break; requires proof of U.S. ties
Trips ≥ 1 YearAutomatic break in residence (unless Form N-470 approved)
Early Filing WindowUp to 90 calendar days before anniversary date (INA §334(a))

Frequently Asked Questions

For the general 5-year naturalization route under INA §316(a), USCIS requires at least 30 months of physical presence (913 days) during the 5-year period. For the 3-year spouse route under INA §319(a), you need at least 18 months of physical presence (548 days). Every day spent outside the U.S. reduces your cumulative total.

USCIS policy specifically states that the day you leave the United States and the day you return are BOTH counted as days of physical presence in the USA. Therefore, only the calendar days strictly between your departure date and return date (returnDate - departureDate - 1) are subtracted from your physical presence total.

An absence of more than 6 months but less than 1 year creates a rebuttable presumption that continuous residence was disrupted under INA §316(b) and 8 CFR §316.5(c)(1)(i). You must prove to USCIS that you maintained continuous U.S. ties (ongoing employment, home, family in USA).

A continuous absence of 1 year or more automatically breaks continuous residence under 8 CFR §316.5(c)(1)(ii) unless you received prior approval for continuous residence preservation via Form N-470.

Yes. Under INA §334(a) and 8 CFR §310.2, eligible applicants under the 5-year or 3-year rule may submit Form N-400 up to 90 calendar days before reaching their full statutory continuous residence anniversary date.

No. Physical presence is only one statutory requirement. You must also satisfy 5 years of continuous residence, 3 months of residence in your state/district, pass the English and civics tests, and establish good moral character.
Statutory Thresholds
5-Year Requirement:913 Days (30 Mos)
3-Year Spouse Req:548 Days (18 Mos)
State/District Req:3 Months Prior
Early Filing:90 Days Early
USCIS Day Counting Rule

USCIS counts both your departure date and return date as days of physical presence in the USA. Only full 24-hour calendar days strictly outside the U.S. are deducted.

6-Month Rule Warning

Even if you exceed 913 physical presence days, any single absence exceeding 180 days triggers a continuous residence presumption under 8 CFR §316.5(c).