How Hard Is the RD Exam? CDR's Pass Rates by Attempt and Pathway

RD exam pass rates in CDR's latest reports

CDR posts pass/fail statistics for the Registration Examination for Dietitians on its RD Exam Pass/Fail Statistics page. The two most recent half-year reports, checked on October 27, 2026, show these first-attempt results:

The reports count tests, and "first attempt" means a candidate's first sitting. For July–December 2025, CDR's summary pages show 2,361 tests and 64.8%, while the detailed Pearson table in the same file shows 2,360 and 64.9%, with the same 1,531 passes. This guide uses the detailed table, which also gives the attempt breakdown below. The difference doesn't change the picture: roughly two in three first attempts pass, and one in three doesn't.

These figures cover CDR's US exam for dietitians. Searches for "RD exam" also return results about other countries' dietitian exams, which have their own rules and statistics.

Pass rates drop with each RD exam attempt

The same reports break results down by attempt:

Read this table carefully. Each row describes a group, not a person's odds. Candidates sitting a second time are, by definition, people who didn't pass the first time, so the group is different. The numbers say retakes are common and hard. They don't say what your retake will bring. If you're in that group, the RD exam retake guide covers the rules and a plan built around your score report.

Most RD candidates pass within a year

A third CDR report follows examinees for one year from their first attempt. For the group whose one-year window ended in 2025, 2,863 of 3,411 examinees had passed: 83.93%.

That's the most useful number for planning. It suggests that many candidates who miss on the first attempt pass on a later one within the year, although the report doesn't break down how many attempts that took.

RD exam pass rates by pathway and by program

First-attempt results differ by the ACEND pathway that made the candidate eligible:

The one-year report shows the same order with higher numbers: 89.79% for the graduate program pathway, 85.66% for coordinated programs, and 83.23% for dietetic internships. Smaller routes vary more: 69.74% for individualized supervised practice pathways (76 examinees) and 17.07% for reciprocity candidates (41 examinees). The pathways enroll different people in different ways, so the figures describe outcomes, not the effect of a pathway.

Programs vary even more. CDR's 2025 program report covers 403 programs: 190 of them (47%) had a first-time pass rate of 70% or higher, 76 (19%) had 100%, and 38 were below 20%. Program directors receive institutional score reports twice a year, so ask yours how recent graduates have done and which areas they found hardest. Whatever your program's record, everyone sits the same outline, and you can see which domains get the most practice in the planned RD exam prep.

What makes the RD exam hard

The statistics show the outcome. CDR's handbook and FAQ explain much of the cause:

• No going back. You must answer each question to move on, and you can't review or change earlier answers. A doubt about question 12 can't be fixed at question 90.
• Application, not recall. The handbook says questions test comprehension or application, and application questions involve "using information or knowledge to solve a problem, make a decision, select a course of action." Knowing a definition often isn't enough.
• Breadth. Questions from all domains are intermingled. From January 1, 2027, Human Nutrition and Medical Nutrition Therapy is 40% of the exam, so 60% covers management, research, professional practice, community nutrition and food systems. Strength in clinical nutrition alone covers less than half of the weighted outline.
• Unscored questions you can't spot. Twenty-five pretest questions are mixed in and can't be told apart from scored ones, so an unfamiliar question may not count, but you have to treat it as if it does.
• The clock. Three hours for 125 to 145 questions works out to about 74 to 86 seconds per question (Passy's arithmetic). If fewer than 125 questions are answered when time runs out, the exam is scored as a failure.
• Math. An on-screen calculator is provided, and CDR's own free practice set includes foodservice calculations such as a moving-average forecast and depreciation.

To see where the 2027 weights could leave you exposed, see how the planned RD exam prep tracks accuracy in each of the four domains and names the next one to study.

What the RD exam's difficulty doesn't mean

• It isn't graded on a curve. The handbook says the adaptive format compares your performance with the passing standard. If you get a slightly harder set of questions, fewer correct answers are needed to pass, and the reverse is also true. Other candidates' results don't change yours.
• The length of your exam isn't a verdict. CDR doesn't publish what stopping at 125 or continuing to 145 means for an individual. The RD exam format guide explains what can and can't be inferred.
• The scale isn't a percentage. A passing 25 on the 1–50 scale doesn't mean 50% correct, because the number of correct answers needed depends on the difficulty of the questions you get.

Using the RD exam pass rates to plan

Use the numbers to set your preparation, not your expectations:

1. Test all four domains early. The 20 free RD exam practice questions are spread across the 2027–2031 domains, roughly in proportion to their weights. Twenty items can't predict a result, but a miss in an area you haven't studied since coursework is a useful signal.
2. Give time to the domains outside your strongest rotation. The RD exam study plan guide turns the 23/22/40/15 weights into weekly hours.
3. Practice without going back. Answer practice sets in order and commit to each answer, as the exam requires.
4. Book a date you can prepare for. Your Authorization to Test lasts one year, so there's room to choose. If you're weighing a longer runway, review the planned 1,700 questions with an explanation for every answer, and note that checkout isn't open yet.