Skip to main content
US Immigration

US Citizenship Physical Presence Calculator

Count your days physically present in the United States for naturalization (Form N-400). The calculator applies both the 5-year rule (913 days / 30 months) and the 3-year spouse-of-citizen rule (548 days / 18 months), and flags any single absence over 6 months that may break continuous residence.

Your physical presence inputs

Add every trip — including short ones. Even a weekend in Canada counts.

Trips of 180–365 days create a rebuttable presumption of breaking continuous residence.

Physical presence status
—

Enter your details and click check.

Estimate only. USCIS will independently review your travel history (Form N-400 Part 9). Discrepancies between your records and I-94/CBP data can delay adjudication or trigger a Stokes interview.

Physical presence vs continuous residence

Naturalization applicants must satisfy two different residency tests that sound alike but operate differently. Confusing them is one of the most common mistakes on Form N-400.

1. Physical presence — a strict day count

Physical presence means the total number of days you were actually inside the United States during the statutory period. The thresholds are:

  • 5-year rule (general applicant) — at least 913 days (30 months) out of the 5 years immediately preceding the application.
  • 3-year rule (spouse of U.S. citizen) — at least 548 days (18 months) out of the 3 years immediately preceding the application.

There is no exception, no waiver, and no discretion. If you are even one day short, the application will be denied. Short trips (a weekend in Canada, a week in Mexico) all count against you, so maintaining meticulous travel records is essential.

2. Continuous residence — the "where do you live" test

Continuous residence asks whether you have maintained the United States as your primary home. It is not a pure day count — it is a qualitative assessment, but with bright-line rules:

  • Trip under 6 months — generally does not break continuous residence.
  • Trip of 6–12 months — creates a rebuttable presumption that continuous residence was broken. You can rebut it by showing you maintained a US residence, kept a US job, paid US taxes, and had family remaining in the US.
  • Trip of 12 months or more — automatically breaks continuous residence, with very limited exceptions (military, government, certain overseas contract work via Form N-470).

How to count partial days

USCIS counts the day you depart the United States as an absence, but not the day you return. So a Friday-evening trip to Mexico returning Sunday night counts as 1 day of absence (Saturday only). This matters when you are close to the 913-day threshold.

The 90-day early-filing window

You may file Form N-400 up to 90 days before you meet the residency requirement. USCIS will not adjudicate the application until the full statutory period has elapsed, but early filing can save you three months of total processing time. For the full filing timeline, see our N-400 application walk-through.

Keep Reading

Related explainers

N
US Immigration11 min read

US Naturalization: Physical Presence and Continuous Residence Explained

The two residency rules every N-400 applicant must satisfy — physical presence (30 or 18 months) and continuous residence — and how they differ.

Read article
N
US Immigration9 min read

N-400 Application Timeline: From Filing to Oath Ceremony

A realistic look at how long naturalization takes in 2026, including biometrics, interview, and the variance between field offices.

Read article
C
US Immigration10 min read

US Citizenship Test 2026: Civics Questions and English Requirements

The 2008 civics test format, the 2020 short-lived changes, and the English reading and writing standards naturalization applicants must meet.

Read article
Common Questions

Frequently asked questions

Q: What's the difference between physical presence and continuous residence?

Physical presence counts the total days you were physically inside the United States during the statutory period — typically 913 days out of 5 years for naturalization under INA § 316. Continuous residence, by contrast, means you have maintained your primary dwelling in the U.S. without a single absence long enough to be presumed to have broken it. Under INA § 316(b), an absence of more than 6 months (181+ days) creates a rebuttable presumption that you broke continuous residence, and an absence of more than 1 year automatically breaks it (with limited exceptions for military and certain government service). You can have plenty of physical presence but still break continuous residence with one long trip — both requirements must be met independently.

Q: How are partial days counted for US citizenship?

USCIS counts every day you were physically present in the United States, even partial days, as a full day toward the physical presence requirement. The day you depart the U.S. counts as a full day of presence, as does the day you return. So a trip from 1 June to 10 June counts as 8 days of absence (the days fully outside the U.S.). This is more generous than the UK's day-counting rules for ILR. You can document your days using passport stamps, I-94 records, airline boarding passes, and CBP entry/exit history. For naturalization, you must show at least 913 days (30 months) of physical presence in the 5 years immediately before filing Form N-400.

Q: What happens if I take a 7-month trip abroad?

A single absence of more than 6 months (181+ days) but less than 1 year creates a rebuttable presumption that you broke continuous residence under INA § 316(b). You will need to overcome this presumption at your N-400 interview by showing you did not disrupt your life in the U.S. — for example, you continued to work for the same U.S. employer, maintained your home, kept a U.S. bank account and family ties, and the trip was for a defined temporary purpose. If you cannot overcome the presumption, your continuous residence clock resets and you will need to wait another 4 years and 1 day (or 2 years and 1 day if married to a U.S. citizen) before reapplying. An absence of 1 year or more almost always breaks continuous residence and may also require a reentry permit to preserve your green card.

Q: When can I file Form N-400 early?

You can file Form N-400 up to 90 days before you meet the continuous residence requirement, under 8 CFR § 310.2. For most applicants, that means you can file 90 days before your 5-year anniversary as a lawful permanent resident (or 3-year anniversary if married to a U.S. citizen under INA § 319(a)). The 90-day early filing window does NOT apply to the physical presence requirement (913 days) or the time-in-district requirement (3 months) — those must be fully met at the time of filing. Some applicants, like certain military members under INA § 328 and § 329, have entirely different eligibility timelines. Spouses of U.S. citizens stationed abroad can naturalize with no physical residence requirement.

Q: What evidence does USCIS use to verify my travel history?

USCIS cross-references your N-400 application against multiple federal databases, including CBP entry/exit records, I-94 arrival/departure history, and the Electronic System for Travel Authorization (ESTA) where applicable. At your naturalization interview, the officer will compare your list of trips abroad (entered on Form N-400, Part 9) against your passport stamps and may request airline boarding passes, employer letters, or tax returns to confirm. They may also pull your travel history from CBP's Automated Targeting System. Inconsistencies between your disclosed trips and the federal records can trigger a denial for lack of good moral character, or even a false statement charge under 18 U.S.C. § 1001. Always request your CBP travel history before filing to verify accuracy.

Q: Can I count time before I got my green card?

Generally no — physical presence and continuous residence for naturalization begin on the date you became a lawful permanent resident (LPR), shown on your green card as "Resident Since." However, there are limited exceptions. Under INA § 316(a), certain periods of lawful temporary residence (such as LULAC/Life legalization class members, or HRIFA applicants) count toward naturalization. Asylees can credit one year of physical presence as an asylee toward the 5-year requirement under INA § 316(a)(2)(A)(v), and refugees can credit their date of admission to the U.S. under INA § 316(a)(2)(A)(iv). Time spent in the U.S. on a nonimmigrant visa (F-1, H-1B, L-1, etc.) does not count toward the naturalization clock.