N-400 Eligibility Calculator
Determine your potential eligibility for U.S. citizenship.
Select the category that applies to you. Most applicants use the 5-year rule.
This date is on your Green Card, often labeled “Resident Since.”
Enter the total number of days for all trips outside the U.S. during your required residency period.
Trips over 6 months can break your continuous residence. Trips over 1 year are a significant issue.
This calculator estimates your eligibility based on two key requirements: Continuous Residence (living in the U.S. for a required period) and Physical Presence (being physically in the U.S. for a minimum number of days). You may file Form N-400 up to 90 days before you meet the continuous residence requirement.
Your progress towards meeting Physical Presence and Continuous Residence requirements.
What is an N-400 Eligibility Calculator?
An N-400 eligibility calculator is a digital tool designed to help Lawful Permanent Residents (LPRs), also known as Green Card holders, estimate if they meet the core time-based requirements for U.S. naturalization. The process of becoming a U.S. citizen is called naturalization, and the application form used is Form N-400, Application for Naturalization. This calculator focuses on two of the most critical and often confusing criteria: “Continuous Residence” and “Physical Presence.” By inputting key dates and travel history, an applicant can get a preliminary assessment of their standing and identify their potential 90-day early filing date. It simplifies the complex rules set by U.S. Citizenship and Immigration Services (USCIS) into a user-friendly format, but it is not a substitute for legal advice or an official determination by USCIS.
This tool is for anyone with a Green Card who is considering applying for U.S. citizenship. A common misconception is that as long as you have a Green Card for five years, you are automatically eligible. However, the N-400 eligibility calculator helps clarify that time spent outside the U.S. can significantly impact your eligibility timeline.
N-400 Eligibility Formula and Mathematical Explanation
The “formula” for N-400 eligibility is not a single mathematical equation but a set of rules based on time. The N-400 eligibility calculator processes these rules to provide a clear outcome.
- Determine the Statutory Period: This is typically 5 years for most LPRs, or 3 years for those married to and living with a U.S. citizen.
- Calculate Continuous Residence: This checks if you have maintained your residence in the U.S. for the entire statutory period. Your residence is your main home, or domicile. An absence of more than 6 months (181+ days) is presumed to break continuous residence. An absence of over 1 year automatically breaks it unless you have an approved Form N-470. The N-400 eligibility calculator flags this as a major issue.
- Calculate Physical Presence: This is a simple count of days. You must have been physically present in the U.S. for at least half of your statutory period.
- For the 5-year rule: 30 months, which is approximately 913 days.
- For the 3-year rule: 18 months, which is approximately 548 days.
The calculator subtracts your total days abroad from the total days in your statutory period to determine this.
- Identify the Early Filing Date: USCIS allows applicants to file Form N-400 up to 90 days before they meet their continuous residence requirement. The calculator determines this date by taking your continuous residence completion date and subtracting 90 days.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Statutory Period | The required duration of permanent residence. | Years | 3 or 5 |
| Physical Presence | The minimum number of days you must be inside the U.S. | Days | 548 (for 3 years) or 913 (for 5 years) |
| Continuous Residence | Maintaining a U.S. residence without long interruptions. | Years | 3 or 5 |
| Absence | Any trip outside the U.S. lasting 24 hours or more. | Days | 0 to 180 (recommended per trip) |
Practical Examples (Real-World Use Cases)
Example 1: Standard 5-Year Applicant
Sofia became a Lawful Permanent Resident on March 15, 2021. She is applying under the 5-year rule. Over the past five years, she took several family vacations, totaling 150 days outside the U.S. No single trip was longer than 30 days.
- Inputs for N-400 eligibility calculator:
- Basis: 5 years
- LPR Date: 2021-03-15
- Days Outside US: 150
- Long Trip > 6 months: No
- Calculator Outputs:
- Continuous Residence Met: On March 15, 2026.
- Physical Presence: 1826 days (5 years) – 150 days = 1676 days. This is well above the 913-day requirement.
- Earliest Filing Date: December 15, 2025 (90 days before March 15, 2026). Sofia is eligible to file.
Example 2: 3-Year Applicant with Significant Travel
David obtained his Green Card through marriage to a U.S. citizen on July 1, 2023. His job requires international travel, and he has spent a total of 400 days outside the U.S. in the last three years. His longest trip was 45 days.
- Inputs for N-400 eligibility calculator:
- Basis: 3 years (Married to USC)
- LPR Date: 2023-07-01
- Days Outside US: 400
- Long Trip > 6 months: No
- Calculator Outputs:
- Continuous Residence Met: On July 1, 2026.
- Physical Presence: 1095 days (3 years) – 400 days = 695 days. This is above the 548-day requirement for the 3-year rule.
- Earliest Filing Date: April 2, 2026 (90 days before July 1, 2026). David can use the N-400 eligibility calculator to confirm this and prepare his application.
How to Use This N-400 Eligibility Calculator
Using this N-400 eligibility calculator is a straightforward process to get a quick snapshot of your eligibility timeline. Follow these steps:
- Select Your Basis: Choose whether you’re applying under the standard 5-year rule for permanent residents or the 3-year rule for spouses of U.S. citizens.
- Enter Your LPR Date: Find the “Resident Since” date on your Green Card and enter it into the calculator. This is the starting point for all calculations.
- Input Total Days Abroad: Gather your travel records and sum up the total number of days you’ve spent outside the U.S. since becoming an LPR. Be precise. Even short trips count.
- Answer the Long Trip Question: Indicate if you have taken any single trip that lasted for more than 180 days. This is a critical factor for continuous residence.
- Review Your Results: The calculator will instantly display your primary eligibility status, your earliest possible filing date, and your total days of physical and continuous residence. Use this information to plan your application submission.
Key Factors That Affect N-400 Eligibility Results
Several factors can influence the outcome shown by the N-400 eligibility calculator. Understanding them is crucial for a successful application.
- Continuous Residence Breaks: An absence from the U.S. of more than six months but less than one year creates a rebuttable presumption that you have broken your continuous residence. An absence of one year or more will automatically break it.
- Physical Presence Shortfall: Failing to meet the 30-month or 18-month physical presence requirement is an absolute bar to filing. Careful tracking of travel days is essential. The N-400 eligibility calculator is perfect for this.
- State Residency Requirement: You must have lived in the state or USCIS district where you plan to file for at least three months prior to filing. This calculator does not verify this requirement.
- Good Moral Character: This is a broad requirement. Issues like criminal records, failure to pay taxes, or lying on an immigration application can lead to a denial. The calculator cannot assess this subjective criterion.
- Age and English/Civics Test: Applicants must be at least 18 years old and generally must pass an English and U.S. civics test. There are some exceptions for age and disability.
- Selective Service Registration: Male applicants who lived in the U.S. between the ages of 18 and 26 must have registered for the Selective Service.
This N-400 eligibility calculator is an invaluable first step in your journey to citizenship, providing clarity on the time-based requirements.
Frequently Asked Questions (FAQ)
1. What if I made a trip that was longer than 6 months?
If you have a trip lasting more than 180 days but less than a year, USCIS presumes you broke continuous residence. You will need to provide evidence to overcome this presumption, such as proof of continued U.S. employment, tax filings, and maintaining a home. The N-400 eligibility calculator will flag this as a potential issue.
2. Can I file Form N-400 with an expired Green Card?
Yes, you can apply for naturalization with an expired Green Card. However, USCIS recommends you renew your Green Card before or at the same time as filing your N-400, as you must prove your LPR status is still valid.
3. Does travel to Canada or Mexico count as time outside the U.S.?
Yes. Any time spent outside the United States, even for trips lasting just over 24 hours to neighboring countries, must be counted towards your total days abroad.
4. What is the “90-day early filing rule”?
USCIS allows you to submit your Form N-400 up to 90 calendar days before you officially meet the 3-year or 5-year continuous residence requirement. Our N-400 eligibility calculator automatically determines this date for you.
5. What happens if I fail the English or civics test?
If you fail either test during your interview, USCIS will give you a second opportunity to take the test, usually within 60 to 90 days. If you fail a second time, your N-400 application will be denied.
6. Does this calculator guarantee my eligibility?
No. This N-400 eligibility calculator is an informational tool for estimating time-based requirements only. It does not assess other critical factors like good moral character, state residency, or attachment to the Constitution. Final eligibility is determined solely by USCIS.
7. What if I have a criminal record?
Having a criminal record can seriously impact your “good moral character” determination. Some crimes may be a temporary bar, while others may permanently disqualify you. You should consult with an immigration lawyer before using the N-400 eligibility calculator or filing your application.
8. Do my children become citizens when I naturalize?
Your children under 18 who are also LPRs and in your legal and physical custody may automatically derive citizenship when you naturalize. This is a complex area of law, and you should review the Child Citizenship Act for specific requirements.