N-400 Calculator
Estimate N-400 physical presence, continuous residence, and an earliest naturalization eligibility date from your travel history.
Travel & Physical Presence Tracker
Track your international trips to estimate physical presence for the US N-400 Naturalization application (30-month rule) and monitor days against a common 183-day tax-residency threshold. This is an estimate, not legal advice.
Log a Trip
On: both exit and return count. Off: duration only (end − start).
USCIS uses the 3- or 5-year statutory period. This is an estimate, not legal advice.
Trip History
0 TripsNo trips logged yet.
US N-400 Compliance
Nomad 183-Day Rule
Most countries establish tax residency if you spend 183 days or more in a 12-month period within their borders. Estimate only — not tax advice.
Clear under 183 rule
Your longest continuous trip is 0 days. Ensure your total combined days per country also stay under 183.
What is an N-400 calculator?
An N-400 calculator is a tool that estimates physical presence days, continuous residence, and an earliest naturalization eligibility date from your green card date and trips abroad. Enter those dates — this page does not file Form N-400 or contact USCIS.
This is an estimate from the dates you enter — not legal or immigration advice. Eligibility is not a USCIS determination.
How to Calculate Your N-400 Eligibility
Who Is This For?
- →Green card holders approaching their 3- or 5-year eligibility window who need to verify they have met both physical presence and continuous residence requirements before filing.
- →Immigration lawyers and paralegals doing quick eligibility checks for clients without pulling full travel history by hand.
- →Digital nomads and frequent travelers who want an estimated eligibility date and plan future trips without accidentally delaying it.
Key Benefits
- ✓Privacy. Tool inputs stay in the browser.
- ✓Free to use now. No account, no paywall. Ads are not live yet.
- ✓No account needed. Works instantly — open the page and start entering trips.
- ✓Estimates your eligibility date. Based on your green card date and marriage status — not just a general rule. It also flags any single trip that may have disrupted continuous residence.
Common N-400 Mistakes
- ✗Filing before the 90-day early window opens — USCIS allows filing up to 90 days before your eligibility date, but filing any earlier results in automatic rejection and lost filing fees.
- ✗Counting departure and return days as full days abroad — USCIS counts departure and return as days inside the US, so a trip from Monday to Friday counts as 3 days abroad, not 5.
- ✗Ignoring a single trip over 180 days — one trip exceeding 180 days presumptively breaks continuous residence even if your total days abroad are under the 913-day limit; these are two separate requirements.
- ✗Using the wrong eligibility track — spouses of US citizens qualify under the 3-year rule, not the 5-year rule; using the wrong track produces an incorrect eligibility date.
Planning your naturalization timeline often requires tracking dates across multiple events — pair this tool with our Date Calculator to count exact days between trips, and the Currency Converter if you need to manage finances across international trips during your continuous residence period.
For official N-400 requirements and the current physical presence rules, refer directly to the USCIS N-400 Application for Naturalization page, which is the authoritative source for eligibility criteria and current filing fees.
Common Use Cases
Pre-filing eligibility check. Before submitting Form N-400, verify that your logged trips leave you within the 913-day physical presence limit and that no single trip exceeds 180 days.
Checking past trips for continuous residence issues. If you took a long trip years ago, enter it here to see whether it disrupts your clock and how that affects your earliest filing date.
Travel planning. Planning a long trip abroad? Enter the hypothetical dates to see whether it would push your naturalization eligibility date forward before committing.
The USCIS N-400 Requirements
If you are applying for US citizenship through naturalization using the standard 5-year route, you must satisfy two primary physical presence constraints:
- Physical Presence Limit: You must have been physically present in the United States for at least 30 months out of the 5 years (which translates to strictly no more than 913 days outside the US).
- Continuous Residence (6-Month Rule): If you take a single trip outside the United States that lasts more than 180 days (6 months), it automatically disrupts your continuous residence, potentially resetting your 5-year clock.
The Digital Nomad 183-Day Tax Rule
Most countries worldwide use the "183-day rule" to determine your tax residency. If you stay within a country's borders for 183 days or more in a given calendar year (or rolling 12-month period), you are legally recognized as a tax resident of that country and are subject to local income taxes on your global income.
Using this calculator, you can log all your trips and ensure your maximum trip length never breaches this critical threshold, protecting you from double taxation. All dates entered are calculated locally in your browser.
Frequently Asked Questions
What is the N-400 form? ↓
Is this N-400 calculator free? ↓
How long do I need to be a green card holder to apply for citizenship? ↓
What is the continuous residence requirement? ↓
What is the physical presence requirement for naturalization? ↓
Can a trip abroad affect my N-400 eligibility date? ↓
This tool is provided for informational and educational purposes only. Results are not a substitute for professional advice.
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