The RD exam: format, pass rates and a study plan

By the DieticiansWorldwide.com editorial team · 18 October 2026 · Careers & pay

What the RD exam is, and who sits it

The Registration Examination for Dietitians is the last step before you can use the RD or RDN credential in the United States. It is set by the Commission on Dietetic Registration, the credentialing agency of the Academy of Nutrition and Dietetics, and delivered by Pearson VUE at more than 250 test centres in the US and selected other countries, according to the 2026 RD Exam Handbook for Candidates.

You cannot simply book it. You first need verified eligibility: completion of an accredited didactic programme, accredited supervised practice and, for anyone establishing eligibility for the first time since 1 January 2024, a graduate degree. CDR's graduate degree page says the minimum degree "changed from a bachelor's degree to a graduate degree" on that date, while all other education and supervised practice rules stayed the same. People who established eligibility on or before 31 December 2023 are exempt.

This article covers the exam itself: what is on it, how it is scored, how many people pass and how to prepare. If you are still choosing a degree or wondering whether dietetics is right for you, start with our pillar guide on how to become a dietitian, then read our step-by-step guide to becoming a registered dietitian. For the master's options that now sit in front of the exam, see our guide to a master's in nutrition.

How you get authorised to test

Once your programme director confirms you have finished, CDR processes your eligibility and Pearson emails an Authorisation to Test, usually in less than a week, according to the handbook. That authorisation lasts one year. It ends early if you sit the exam, miss or arrive late for an appointment, fail to cancel in time, or cannot show a qualifying government photo ID whose name matches your Pearson profile exactly. Expiry does not cancel your eligibility; you simply reauthorise.

Exam format: questions, time and adaptive testing

The RD exam is shorter than many candidates expect and less forgiving than a paper test.

• Length: a minimum of 125 questions (100 scored and 25 unscored pretest items) and a maximum of 145 (120 scored plus the same 25 pretest items). You cannot tell which questions are pretest items, so treat every one as if it counts.
• Time: three hours of testing inside a three-and-a-half-hour appointment, which also includes a 20-minute tutorial and a 10-minute survey.
• Format: four-option multiple choice, with an on-screen calculator and an erasable note board.
• No going back: you must answer each question before moving on, and you cannot review or change earlier answers.
• Computer-adaptive: the software tracks how you are doing against the passing standard and how hard each question is, and stops once it can make a confident pass or fail decision.

That last point causes the most anxiety. Finishing at 125 questions tells you nothing about whether you passed. The exam can stop early for candidates well above or well below the standard, and run longer for those near it.

Accommodations

CDR provides accommodations for candidates with documented disabilities under the Americans with Disabilities Act, assessed by Pearson. You must apply and be approved before you book, accommodated appointments are booked by phone, and you need to reapply for every attempt.

What the exam covers: the four domains

The current content outline runs from 1 January 2022 to 31 December 2026 and is built on a 2020 practice analysis. It weights four domains:

• Principles of Dietetics (21%): food, nutrition and supporting sciences; education, communication and technology; research applications.
• Nutrition Care for Individuals and Groups (45%): screening and assessment, diagnosis, planning and intervention, monitoring and evaluation.
• Management of Food and Nutrition Programs and Services (21%): management functions, human resources, finance, marketing and public relations, quality and regulatory compliance.
• Foodservice Systems (13%): menu development; procurement, production, distribution and service; sanitation and safety; equipment and facility planning.

Questions sit at the comprehension or application level. Expect to interpret a lab table, choose the next step in a care plan or work out a food cost, rather than recall a single definition.

The outline changes on 1 January 2027

If you will test in 2027 or later, study from the new outline. CDR approved the 2027 to 2031 RD test specifications on 25 June 2025, and they reorganise the exam:

The most visible change is that community and public health nutrition becomes a domain of its own at 22%, while individual clinical care, now grouped with human nutrition and physiology, drops from 45% to 40%. Management moves into a broader professional practice domain that also covers research and leadership topics such as health equity. If your programme taught to the old outline, compare your notes against the expanded 2027 study outline on CDR's exam preparation page, which also lists official practice questions and references.

Scoring: what score do you need to pass?

The exam is scored on a scale of 1 to 50 and the minimum passing scaled score is 25. Because every candidate sees a different set of questions, the number you must answer correctly to reach 25 varies. If you receive a slightly harder set, fewer correct answers are needed; an easier set needs more. This is why there is no fixed "percentage correct" to aim for, and why online claims about passing with a particular raw score are not reliable.

You see your result on screen and leave with a printed score report showing your total scaled score and sub-scores by content area. CDR stresses that sub-scores do not decide the outcome and are less precise where a domain has few questions. Use them as a rough guide to what to revise if you need to retest, not as a verdict on your clinical knowledge.

RD exam pass rates

CDR publishes first-attempt results every six months, broken down by eligibility pathway. The figures below cover first attempts by graduates of the three main accredited routes: Coordinated Programs, Dietetic Internships and the newer Graduate Programs.

Two patterns stand out. First, roughly one first-time candidate in three does not pass, so a fail is common and recoverable, not a sign you chose the wrong career. Second, the pathway matters less than many students assume. In January to June 2025, Coordinated Program graduates passed at 67.4%, Dietetic Internship graduates at 64.9% and Graduate Program graduates at 65.9%. Candidates on smaller routes, such as individualised supervised practice pathways, passed at much lower rates, but the numbers are too small to draw firm conclusions.

What the master's rule did to candidate numbers

The number of first-time candidates from accredited programmes almost halved between the second half of 2023 and the first half of 2024, from 2,890 to 1,509 tests, and fell again to 1,314 in the first half of 2025. CDR's reports do not explain the change. The timing fits the graduate degree deadline: students who finished a bachelor's-level route in 2023 had a strong reason to establish eligibility before 1 January 2024, which would have pulled candidates forward into late 2023. Whether the lower numbers since then reflect a smaller pipeline, students taking longer to finish master's programmes, or both, the published data cannot yet tell us. What is clear is that first-attempt pass rates have stayed in a narrow band, between 62.2% and 65.4%, across the four reporting periods either side of the change.

Fees, retakes and reauthorisation

• Exam fee: $250, paid by card when you book. The fee is separate from Academy membership and CDR maintenance fees.
• Test bundle: for $350 you can buy your first attempt plus a voucher for a discounted retake, which is worth it only if you think a second attempt is likely. Vouchers are non-refundable and non-transferable.
• Cancelling or rescheduling: at least 48 hours before your appointment, online or by phone. Inside 48 hours, there is no refund if the centre is open, except for documented illness reported to CDR.
• After a fail: you must reauthorise with CDR and pay again. You can book straight away, but the new appointment must be on or after day 46 after your failed attempt. A one-time waiver of the wait is available only if an employer confirms in writing that you must pass sooner to keep your job.
• How many attempts: CDR sets no limit, provided you respect the 45-day wait. Some state licensing boards have their own retesting rules, so check yours if you hold a provisional licence.

Passing is not the same as being licensed

The RD credential is national, but practice rights are set by states. CDR's September 2025 handout on certification versus state licensure explains that most states require a state licence or certification to practise or to use a protected title, that some offer temporary or provisional licences to exam-eligible graduates working under supervision, and that you must meet the rules of the state where each patient is located, including for telehealth. It also sets the maintenance rule after you pass: an annual registration fee and at least 75 continuing professional education units every five years. Our United States country guide summarises how regulation varies.

How to pass the RD exam: a 10-week study plan

There is no official study timetable. CDR does not endorse any commercial review course and states that buying one is not required. The plan below is ours, built around the published domain weights and the realities of studying while working. It assumes about 8 to 10 hours a week; stretch it if you have less time.

Week 1: baseline and logistics. Download the content outline for the year you will test. Take the official CDR practice questions cold and record your score by domain. Book your exam for roughly 10 weeks out so the deadline is real, and check your ID matches your Pearson profile.

Weeks 2 to 4: the heaviest domain. Spend most of your time on nutrition assessment, diagnosis, intervention and monitoring, which carries 45% of the current exam and, under its new name, 40% from 2027. Work through the nutrition care process with real cases: diabetes, kidney disease, enteral and parenteral nutrition, malnutrition, paediatrics and older adults. Practise calculations daily, including energy and protein requirements, fluid needs, tube-feeding rates and body mass index. Our protein guidance is a useful refresher on how requirement ranges are set.

Weeks 5 and 6: principles, research and communication. Revise macronutrient and micronutrient metabolism, food science, counselling and education theory, and how to read study designs and statistics. If you test from 2027, add community needs assessment, programmes and policy, which now has its own domain.

Weeks 7 and 8: management and foodservice. Many clinically focused candidates under-prepare here. Learn menu planning, food cost and budgeting, staffing and scheduling, quality improvement, food safety temperatures and procurement. These are often application questions with numbers.

Week 9: timed mixed practice. Sit full-length timed sets of 125 to 145 questions with no review allowed, to rehearse the one-way format and your pace.

Week 10: consolidate and rest. Revisit only your weakest areas, sleep properly and visit the test centre route in advance. Arrive early: late arrivals forfeit the fee.

Study tips that matter more than any book

• Answer the question asked, from the perspective of an entry-level dietitian following standard practice, not the cleverest exception you met on placement.
• Read the last line of a long question first so you know what you are looking for.
• Do not try to guess which items are pretest questions.
• If you fail, use your sub-scores to target revision, then rebook for the earliest sensible date after day 46.

How the US exam compares with other countries

Not every country uses a national exam to register dietitians, which matters if you plan to work abroad. Our country comparison tool shows the full picture; the main differences are below.

In Canada, the Canadian Dietetic Registration Examination preparation guide, revised in 2026, says the exam is required in all provinces except Quebec, uses 185 multiple-choice questions in two two-hour parts, and can be attempted no more than three times; see our Canada guide. In the UK, the British Dietetic Association says that completing an approved degree, postgraduate programme or degree apprenticeship "provides eligibility to apply for registration with the HCPC" (BDA). In India, the Indian Dietetic Association asks RD exam candidates for a nutrition degree, a postgraduate diploma or MSc, and six months of continuous training in one of its listed hospitals.

Dietitian or nutritionist: do you need this exam at all?

Only if you want the dietitian credential. The RD exam is the gateway to medical nutrition therapy, hospital posts and insurance-funded care in the US. If your interest is public health, research, the food industry or general wellness, a nutritionist route may suit you better and does not involve this exam. Our guide to how to become a nutritionist sets out those routes, our dietitian vs nutritionist comparison shows what each title allows, and the which nutrition professional tool helps you compare them. If you want a specialism after you pass, our sports nutritionist guide shows how one board certification builds on the RD.

Once you are credentialed, the US Bureau of Labor Statistics reports a median wage of $76,400 for dietitians and nutritionists in May 2025 and projects 8% employment growth from 2025 to 2035 (BLS). Our jobs outlook shows where those roles are.

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