Practice Tool
Civics Practice Test
Simulate the USCIS civics interview with 20 random questions. Answer 12 out of 20 correctly to pass, just like the real test.
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Every free tool on N400Test.com in one place. No account required, no paywalls. Click anything below to jump straight in.
Practice & Study Tools
Practice Tool
128 Civics Questions
Study all 128 official civics questions organized by theme. Filter by topic and review every answer at your own pace.
Study CivicsPractice Tool
Reading Practice
Drill every word on the official USCIS reading vocabulary list with sentence-level practice. Build confidence before your interview.
Practice ReadingPractice Tool
Writing Practice
Practice spelling and writing sentences from the official USCIS writing vocabulary list with instant feedback.
Practice WritingPractice Tool
N-400 Interview Prep
A full walkthrough of what happens at your naturalization interview: what to bring, what to say, and what comes next.
Prep for InterviewPractice Tool
English Test Overview
Everything you need to know about the English language requirement: speaking, reading, writing, vocabulary lists, and exemptions.
Learn MoreBackground Knowledge
Reference Guide
U.S. Citizenship History
An interactive timeline of American history, founding documents, and key citizenship facts, all drawn from the civics test topics.
Explore HistoryReference Guide
Naturalization Process
Step-by-step guide through the entire N-400 process: eligibility, application, biometrics, interview, and the oath ceremony.
See the ProcessReference Guide
Oath of Allegiance
The full text of the U.S. Oath of Allegiance with a clause-by-clause explanation, religious accommodations, and ceremony details.
Read the OathTools & Calculators
Eligibility Calculator
When can you apply? Estimate your eligibility date from your green card date.
Open90-Day Filing Calculator
The exact earliest date you can file Form N-400 without getting rejected.
OpenMock Interview
Rehearse the entire USCIS interview with an officer who questions every answer.
OpenCurrent Civics Answers
The President, Vice President, Speaker, and Chief Justice answers, kept up to date.
OpenContinuous Residence Calculator
Add your trips and see whether any of them break your continuous residence.
OpenDocument Checklist Generator
Answer a few questions and get a printable list of what to bring to your interview.
OpenFee and Fee-Waiver Checker
See the current fee and whether you qualify for a reduced fee or a waiver.
OpenWill I Lose My Citizenship?
Find your country and see whether you can keep your original citizenship after you naturalize.
OpenGuides & Explainers
Guides & Articles
51 plain-language guides answering the most common questions about eligibility, filing Form N-400, the interview, denials, and life after citizenship.
Eligibility & Requirements
Who qualifies for naturalization and the rules you must meet first.
Filing Your N-400
Submitting the application, fees, timing, and common mistakes.
Travel & Continuous Residence
How trips abroad affect continuous residence and your application.
Civics & English Tests
Studying for and passing the civics and English portions.
Biometrics & The Interview
What to expect at biometrics and the naturalization interview.
Records, Conduct & Background
How your record, finances, and past conduct can affect your case.
Denials & Appeals
What happens if USCIS denies your case and how to respond.
Timeline, Ceremony & After Citizenship
The wait, the oath ceremony, and your first steps as a citizen.
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