United States · Exam
Start with CDR’s free resources: the test specifications, the study outline, the reference list and CDR’s own practice questions. CDR doesn’t endorse any prep product and says buying one isn’t required. If you want more practice, the courses, apps and podcasts below are the ones candidates use most. We checked each one’s price and what’s free in October 2026.
The official list of what the exam covers, with the weight of each domain. Use the 2022-2026 outline for exams through December 31, 2026, and the 2027-2031 outline from January 1, 2027.
Checked October 2026
CDR’s own sample questions are the closest thing to the real style. The reference list tells you which textbooks and guidelines the exam draws on. Both are on CDR’s exam resources page.
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This won’t teach you nutrition. It shows you how the screens and the on-screen calculator work, so nothing surprises you on the day. Pearson’s CDR page also has the test center locator.
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A large bank of more than 1,400 RD questions with explanations, plus flash cards. The Mock Exams web app gives five full simulations of 125 to 145 questions in 3 hours, with a mock scaled score. The iPhone app, Dietitian Exam To Go, has 4.6 stars from 30 ratings.
Checked October 2026
Study guides, more than 400 practice questions, over 60 short videos and live group tutoring twice a week, with access until you pass. The mock exams have 125 questions each and can be bought on their own.
Checked October 2026
A question-bank app from INAPPLAB, with quizzes across the exam domains. 4.5 stars from 63 ratings. It isn’t made by CDR, despite the name.
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A question-bank app from Exam Prep OU. Its release notes mention a bank of 1,000 questions. 4.7 stars from 35 ratings. Not affiliated with CDR.
Checked October 2026
The long-running Jean Inman review. The USB course comes with a printed study manual covering all domains and more than 1,000 sample questions. The live class runs 8:00 to 3:00 over two days, with dates from November 2026 to August 2027. Register at least 10 days ahead so the manual arrives.
Checked October 2026
Three months of access to 17 video lectures with notes and quizzes, three timed 145-question mock exams and 525 practice questions in all. Tutoring and single mock exams are sold separately.
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A weekly podcast by Dana J. Fryer, MS, RDN, CNSC, that works through practice questions and students’ questions. Good for review on a commute. Tutoring and a paid membership are optional.
Checked October 2026
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Rules and fees can change, so check the official site before your test.