What’s on the Registered Dietitian (RD) Exam? Domains and Weights for 2026 and 2027
The Registration Examination for Dietitians, the exam behind the Registered Dietitian (RD) and Registered Dietitian Nutritionist (RDN) credentials, is a computer adaptive test of 125 to 145 multiple choice questions with a 3 hour limit, as of October 2026. Of those questions, 25 are unscored pretest items, so you are scored on 100 to 120. The passing scaled score is 25 on a scale of 1 to 50. Through December 31, 2026, the Commission on Dietetic Registration (CDR) weights four domains: Nutrition Care for Individuals and Groups at 45%, Principles of Dietetics at 21%, Management of Food and Nutrition Programs and Services at 21%, and Foodservice Systems at 13%. CDR has also approved a new outline for January 1, 2027 through December 31, 2031 with different domains and weights: Human Nutrition and Medical Nutrition Therapy at 40%, Fundamentals of Dietetics Practice at 23%, Community and Public Health Nutrition at 22%, and Food Science and Food Systems at 15%. The exam fee is $250 as of October 2026. This guide walks through both outlines so you can study the version that matches your test date.
The Four Domains Through December 31, 2026
CDR’s 2026 candidate handbook lists the test specifications in effect from January 1, 2022 through December 31, 2026. The bars below show each domain’s share of the exam, scaled so the largest domain is easiest to compare.
Nutrition Care for Individuals and Groups (45%)
This is the largest domain, and it follows the nutrition care process: screening and assessment, diagnosis, planning and intervention, and monitoring and evaluation. Expect questions on interpreting dietary intake, anthropometrics, and laboratory data, writing nutrition diagnosis statements, medical nutrition therapy across organ systems, enteral and parenteral feeding, texture modified diets, and medication and supplement interactions. It also includes community and group topics such as needs assessment, surveillance data, and national dietary guidance. On a 100 question scored section, 45% works out to about 45 scored questions, our own arithmetic rather than a CDR figure.
Principles of Dietetics (21%)
CDR groups this domain into food, nutrition and supporting sciences; education, communication and technology; and research applications. Think food science and composition, nutrient functions across the lifespan, anatomy and physiology, counseling and behavior change theory, informatics and confidentiality, and reading study designs and statistics.
Management of Food and Nutrition Programs and Services (21%)
The five sub-areas are functions of management, human resource management, financial management, marketing and public relations, and quality management and regulatory compliance. Budgets, staffing calculations, employment law, pricing, accreditation, and quality improvement tools all live here. At 21%, it carries the same weight as Principles of Dietetics.
Foodservice Systems (13%)
The smallest domain covers menu development, procurement, production, distribution and service, sanitation and safety, and equipment and facility planning. It is also the most calculation friendly: yield, portion control, and forecasting questions have one defensible answer.
What Changes on January 1, 2027
CDR approved a new Registered Dietitian Examination outline on June 25, 2025, covering January 1, 2027 through December 31, 2031. The domain names change, not just the percentages, so the two outlines do not map one to one. Management and research topics move into a combined first domain, community nutrition becomes its own domain, and clinical nutrition consolidates into a single domain.
| 2027 to 2031 domain | Weight | Sub-areas listed by CDR |
|---|---|---|
| Fundamentals of Dietetics Practice | 23% | Management and leadership; marketing and public relations; research applications; professional practice |
| Community and Public Health Nutrition | 22% | Community nutrition guidelines and policies; community needs assessment; community programs and services |
| Human Nutrition and Medical Nutrition Therapy | 40% | Human nutrition and physiology; screening and assessment; diagnosis; planning and intervention; monitoring and evaluation |
| Food Science and Food Systems | 15% | Food science; menu development; flow of food from procurement to service |
Per CDR’s published test specifications, as of October 2026. The specifications cover content weights; the question count and time limit above come from CDR’s 2026 candidate handbook.
The practical takeaway: the clinical core stays the largest share on both outlines, but community nutrition becomes a distinct 22% block starting in 2027, and professional practice topics such as ethics and health information privacy sit alongside management in the first domain. If you test near the cutover, confirm with CDR which outline applies to your appointment date.
Try a Sample Question
This original item sits in the foodservice area, which appears on both outlines. It is easy to medium difficulty and is not drawn from any CDR material.
How the Exam Is Built and Scored
The exam is delivered at Pearson VUE test centers, and CDR’s handbook describes more than 250 centers. Every question has four answer options and must be answered before you move on; you cannot return to earlier questions or change answers. Questions from all domains are intermingled rather than grouped. CDR states that items test either comprehension or application, where application means using knowledge to solve a problem, make a decision, or select a course of action.
Because the test is adaptive, the number of questions you see varies. You must answer at least 125 to receive a pass or fail result. Scoring runs from 1 to 50 with a passing score of 25, and the number of correct answers needed to reach 25 varies by exam form, which is why CDR does not publish a percent correct target. Your appointment is 3.5 hours: a 20 minute tutorial, 3 hours of testing, and a 10 minute survey, as of October 2026.
Frequently Asked Questions
How many questions are on the RD exam?
Between 125 and 145 questions, as of October 2026. The minimum is 100 scored plus 25 unscored pretest questions; the maximum is 120 scored plus 25 pretest. Pretest items look identical to scored ones.
What are the RD exam domains and weights?
Through December 31, 2026: Nutrition Care for Individuals and Groups 45%, Principles of Dietetics 21%, Management of Food and Nutrition Programs and Services 21%, Foodservice Systems 13%. From January 1, 2027 through December 31, 2031: Human Nutrition and Medical Nutrition Therapy 40%, Fundamentals of Dietetics Practice 23%, Community and Public Health Nutrition 22%, Food Science and Food Systems 15%.
What score do you need to pass the RD exam?
A scaled score of 25 on a scale of 1 to 50, as of October 2026. The raw number of correct answers behind a 25 differs between exam forms.
How much does the RD exam cost?
The examination fee for dietitians is $250 as of October 2026, according to CDR’s 2026 candidate handbook. CDR also sells an optional test bundle for $350 that includes the first attempt and a discounted retake voucher.
Ready to study against the weights above? Start practicing now with RD practice questions organized by domain, or try a free RD practice test to see where you stand first.
Sources
- CDR, Registration Examination for Dietitians overview
- CDR, 2026 RD Exam Candidate Handbook (format, fee, scoring, 2022 to 2026 test specifications)
- CDR, RD Examination Test Specifications and Study Outline, January 1, 2027 to December 31, 2031
- CDR, Study resources and test specifications
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For educational and exam preparation purposes only. Not a substitute for formal clinical training.
