Citizenship Clock
Know the day you can apply for citizenship.
Citizenship Clock tracks your trips abroad, applies the USCIS rules for continuous residence and physical presence, warns you before a trip gets too long, and hands you the N-400 trip list when it’s time to file.
No account. No ads. Your travel history stays on your phone.
N-400 eligibility calculator
Enter the Resident Since date on your green card and your trips outside the U.S. Nothing you type leaves this page.
Estimate only. Not legal advice. Not affiliated with USCIS.
Why people use the app
Live countdown
Your filing date updates every time you travel.
Trip alerts
A heads-up before a trip reaches 6 months or 1 year.
I-94 import
Paste your CBP travel history and review your trips in seconds.
N-400 ready
Every trip of 24 hours or longer, with dates, countries and days, as PDF and CSV.
Questions
How early can I file Form N-400?
Up to 90 days before you reach 5 years as a permanent resident (3 years if married to and living with a U.S. citizen), counted from the Resident Since date on your green card.
How many days do I need to be in the U.S.?
At least 913 days in the 5 years before filing, or 548 days on the 3-year path. The day you leave and the day you return count as days in the U.S.
Does a trip over 6 months break continuous residence?
A trip of more than 6 months but less than a year is presumed to break continuous residence unless you can show you kept your ties, such as your job, home and family in the U.S. A trip of a year or more breaks it; on the 5-year path you can apply 4 years and 1 day after you return.
Which trips go on the N-400?
Every trip outside the U.S. of 24 hours or longer during the last 5 years, with the dates you left and returned and the countries you visited.
Is my I-94 travel history enough?
It’s a good start, but CBP says the travel history can be incomplete. Check it against your passport stamps and your own records.