U.S. Citizenship Eligibility Calculator: When Can You Apply for Naturalization?
Estimate your earliest N-400 filing date in seconds. This free citizenship eligibility calculator is for green card holders on the 5-year or 3-year path: enter your green card date and any trips abroad to see your anniversary, your earliest filing date under the 90-day rule, and whether long trips could affect your eligibility. It is an estimate for educational purposes, not legal advice.
How the citizenship eligibility calculator works
The three requirements it checks, plus the 90-day early filing rule.
The calculator checks the three core requirements for naturalization. First, your time as a permanent resident: 5 years on the general path, or 3 years if you are married to and living with a U.S. citizen. Second, continuous residence: that you have not broken the continuity of living in the United States with a long single trip. Third, physical presence: that you have spent at least half of the qualifying period in the country, about 913 days for the 5-year path or 548 days for the 3-year path.
It then applies the 90-day early filing rule, which lets you file Form N-400 up to 90 days before your anniversary. See the USCIS general naturalization requirements for the official rules.
Continuous residence and trips abroad
The part most calculators get wrong.
Most calculators oversimplify this and just flag any trip of 6 months or more. The real rule has three tiers:
- Trips under 6 months: generally safe and do not break continuous residence.
- Trips of 6 to 12 months: create a rebuttable presumption that you broke continuous residence. You may be asked to provide evidence that you did not abandon U.S. residence, such as tax returns, employment, and housing records.
- Trips of 12 months or more: generally cause an automatic break in continuous residence.
If continuous residence is broken, your clock could reset, and the timing runs from your return date, not your departure date. For longer planned trips, a reentry permit (Form I-131) may help preserve your status. See the USCIS Policy Manual (Volume 12, Part D) for the continuous residence rules.
What if a trip put my eligibility at risk?
A risk flag in the calculator means a trip falls into the 6-to-12-month or 12-month-plus tier, so it could affect your timeline. It is an estimate, not a determination. A licensed immigration attorney can assess a borderline case, and you may be able to overcome a rebuttable presumption with the right evidence.
What your result means
How to read your three dates.
The result panel shows three things: your anniversary date (when you reach the required years as a permanent resident), your earliest N-400 filing date (90 days before that anniversary), and an estimate of your physical presence against the requirement. If you want the full picture of the timeline, read when you can apply for citizenship.
Get the full picture in the app
This page is a one-time estimate. The app tracks your real travel history and recalculates automatically as you go.
- Days in and days out, at a glance. Your running totals inside and outside the U.S., always up to date.
- A live citizenship countdown. Your earliest N-400 filing date and your progress toward the physical-presence requirement.
- Simulate trips before you book. Add a planned trip and instantly see how it changes your continuous residence and filing date.
- Alerts before you cross a line. Get warned as a trip approaches the 6-month and 12-month thresholds.
- Your whole travel picture. Longest U.S. stay, days by year, and most-visited countries.
- Private by design. Works offline, no account required, and can be locked with Face ID. One-time purchase, no subscription.
Frequently asked questions
Common questions about N-400 eligibility and travel.
Who is eligible to apply for U.S. citizenship?
Most lawful permanent residents can apply after holding a green card for 5 years, or 3 years if they are married to and living with a U.S. citizen. You must also meet continuous residence and physical presence requirements, be at least 18, and show good moral character. USCIS makes the final determination.
Can I apply for citizenship before 5 years?
You can file Form N-400 up to 90 days before your 5-year (or 3-year) anniversary under the early filing rule. You cannot file earlier than that 90-day window. The calculator subtracts 90 days from your anniversary to show your earliest filing date.
How is the 90-day early filing window calculated?
Take the date you became a permanent resident, add 5 years (or 3 years for the marriage path), then subtract 90 days. Filing even one day too early can lead to a denial, so confirm the date against your full travel history before you file.
Do trips abroad affect my citizenship eligibility?
They can. Long trips may affect continuous residence, and total time abroad reduces your physical presence days. The calculator estimates both and flags trips that could create a problem, but USCIS reviews the specifics of each case.
Does a trip of 6 months or longer break my continuous residence?
Not automatically. A trip of 6 to 12 months creates a rebuttable presumption that you broke continuous residence, which means you may be asked to show you did not abandon U.S. residence (for example, with tax returns, employment, and housing evidence). A trip of 12 months or more generally does break continuous residence.
How many days do I need to be physically present in the U.S.?
You generally need at least half of the qualifying period in the United States: about 913 days for the 5-year path or 548 days for the 3-year path. The calculator subtracts your total days abroad from the period to estimate where you stand.
What is the difference between continuous residence and physical presence?
Continuous residence is about not breaking the continuity of living in the U.S. with long single trips. Physical presence is the running total of days you were actually in the country. You must satisfy both, and a single long trip can affect each one differently.
Is this the same as the USCIS naturalization eligibility tool?
No. This is an independent educational estimate, not an official USCIS tool and not legal advice. For an official determination, use USCIS resources or consult a licensed immigration attorney.
This calculator provides general estimates for educational purposes and is not legal advice. Eligibility determinations are made by USCIS. Consult a licensed immigration attorney for your specific situation.
