Citizenship Residency Calculator
Track your physical presence and continuous residence to see if you qualify for naturalization.
Track your naturalization eligibility
Calculate physical presence and continuous residence from your green card date and travel history.
The "Resident Since" date on your Permanent Resident Card.
Use the 3-year rule only if married to and living with a US citizen spouse who has been a citizen for ≥3 years.
Convention used: day of departure does not count as presence, day of return does. We compute absence days as (return − departure).
How to use this calculator
- Enter your green card date—the "Resident Since" date printed on the front of your Permanent Resident Card (Form I-551).
- Choose the statutory period—5-year rule for most applicants, 3-year rule if married to and living with a US citizen for the past 3 years.
- Add each trip outside the US taken since your green card date. Click "Add trip" for additional rows.
- Enter departure and return dates for each trip. The calculator counts absence days as return minus departure.
- Click Calculate Eligibility to see your total days present, required days, trip analysis, and earliest application date.
- Review the eligibility banner—it flags physical-presence deficits, trips over 6 months (rebuttable presumption), and trips over 12 months (statutory break).
How US naturalization residency rules work
US citizenship through naturalization (Form N-400) requires applicants to satisfy three interlocking time-based requirements: statutory period as a permanent resident, continuous residence in the US, and physical presence in the US. Each is measured differently, and confusion between them is one of the most common reasons N-400 applications are denied.
Statutory period: 5 years vs 3 years
Most applicants must wait 5 years from the date they became a lawful permanent resident (the "Resident Since" date on the green card). The 3-year rule applies to applicants married to and living with a US citizen spouse, provided the spouse has been a US citizen for at least 3 years and the applicant has been a permanent resident for at least 3 years. Certain military service members and their families may qualify under even shorter or different rules.
Continuous residence: the trip-length rules
Continuous residence means you have maintained your primary residence in the US during the statutory period. The rules turn on trip length:
- Trips under 6 months: Generally do not break continuous residence.
- Trips of 6 to 12 months: Create a rebuttable presumption that you broke continuous residence. You can rebut it with evidence—US tax returns, maintained US home, family in US, US employment, no employment abroad.
- Trips over 12 months: Automatically break continuous residence, restarting the statutory clock—unless you filed Form N-470 (Application to Preserve Residence for Naturalization Purposes) before the trip.
Physical presence: every day counts
Physical presence is the literal count of days you were inside the US during the statutory period. You must have at least 30 months (913 days) of physical presence for the 5-year rule, or 18 months (548 days) for the 3-year rule. The day you departed the US does not count as presence; the day you returned does. This calculator uses that convention.
The 90-day early filing window
USCIS allows you to file Form N-400 up to 90 days before your statutory period is complete—so 4 years and 9 months after your green card date for the 5-year rule, or 2 years and 9 months for the 3-year rule. Filing early does not waive any requirement: by your interview date, the full statutory period must have elapsed and all physical presence and continuous residence requirements must be met.
Additional requirements not captured here
Time-based eligibility is necessary but not sufficient. You must also demonstrate good moral character for the statutory period (no disqualifying criminal convictions, paid taxes, paid child support), English and civics knowledge (with limited age/years-of-residence exemptions), attachment to the Constitution, and willingness to take the Oath of Allegiance. Selective Service registration (for males 18–25) and timely tax filing are frequent stumbling blocks—consult an immigration attorney if either is unresolved.
Why this calculator's results are a starting point
This tool applies the publicly stated USCIS time rules to your inputs. It cannot evaluate documentary evidence, good moral character issues, the strength of a rebuttal argument for a 6–12 month trip, complex N-470 eligibility, or military-service exceptions. Treat results as a planning estimate—then verify against the current USCIS Policy Manual and consider professional review before filing.
Worked example
Scenario: Maria received her green card on March 15, 2019. She's applying under the 5-year rule. Her trips during the statutory period (March 15, 2019 – March 15, 2024):
- Trip 1: Dec 20, 2019 → Jan 5, 2020 (16 days)
- Trip 2: Jul 10, 2021 → Aug 28, 2021 (49 days)
- Trip 3: Apr 1, 2022 → Sep 30, 2022 (182 days — just under 6 months)
- Trip 4: Dec 15, 2023 → Jan 2, 2024 (18 days)
Total absence: 16 + 49 + 182 + 18 = 265 days
Days present in US: 5 years × 365 days + 1 leap day = 1,826 total days in period − 265 absent = 1,561 days present
Required: 913 days (30 months). Maria exceeds this comfortably.
Longest trip: 182 days — just under the 6-month threshold, so no rebuttable presumption arises.
Continuous residence: Intact — no trip exceeded 6 months.
Earliest filing date: March 15, 2019 + 4 years + 9 months = December 14, 2023 (90 days before March 15, 2024).
Result: Maria meets the time-based naturalization requirements as of her statutory period end. She can file Form N-400 starting December 14, 2023.
Glossary
- Statutory period
- The required continuous period of permanent residency before naturalization: 5 years for most applicants, 3 years for spouses of US citizens meeting additional conditions.
- Physical presence
- The literal count of days inside the US during the statutory period. Must total at least 30 months (913 days) for the 5-year rule or 18 months (548 days) for the 3-year rule.
- Continuous residence
- Maintenance of your primary residence in the US during the statutory period. Trips over 6 months create a rebuttable presumption of breaking it; trips over 12 months break it automatically.
- Rebuttable presumption
- After a 6–12 month trip, USCIS presumes you broke continuous residence, but you can rebut that presumption with evidence (taxes, US home, family, employment).
- Form N-470
- Application to Preserve Residence for Naturalization Purposes. Filed before an extended trip abroad to preserve continuous residence for naturalization eligibility.
- 90-day early filing window
- USCIS allows Form N-400 to be filed up to 90 days before the statutory period ends. All other requirements must still be met by the interview date.
Frequently asked questions
Quick answers to the most common questions about citizenship residency calculator.
This calculator is provided for informational and educational purposes only and does not constitute financial, legal, tax, or professional advice. Results are estimates based on the inputs you provide and standard assumptions. Actual figures may vary. Please consult a qualified professional before making financial decisions. Read our full disclaimer.