N400 Calculator
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This tool gives people dates that decide whether they spend $710 or more on a form USCIS does not refund. Tell us a date looks wrong and we check it against the rule it came from.

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Your green card date and your trips stay in your browser. Only what you type below is sent.

How to reach you

Used to reply to you, nothing else.

Your message

Reporting a wrong date? Include your green card date, the path you picked, every trip you entered, the date you got and the date you expected. That is enough to rerun the calculation and check it against the rule.

What this form is not for

Nothing sent here is legal advice, and nothing we write back can become legal advice. Take a question about your own case to an immigration attorney or an accredited representative, or to USCIS directly.

The rules behind every date, and the source each one traces to, are set out on the how it works page.

What happens to what you send

Your name, email address and message go to a database so someone can read them and reply. Your green card date and your trips are not part of that: the calculator works them out in your browser and never sends them anywhere, including here, unless you type them into the message yourself. The privacy policy has the detail.