Food and Drug Administration (FDA)
2,768,897Words in 250 parts
9.8Restriction density (per 1,000 words)
16.7Reading grade
72.4%Unchanged since 2017
30Flagged parts
2026-10-30Last change
Section changes per year
From the eCFR versioner, for the parts that the agency owns now. Before 2017 is the baseline load.
Text and size
- Sentences
- 27.4 words on average; 21.2% over 40 words; 29.2% passive; 15.1 cross-references per 1,000 words
- Sentence types
- definition 2.8% · prohibition 1.7% · paperwork 4.9% · obligation 15.8% · permission 8.4% · other 66.4%
- Checksum
870aefb8f060775365711c18ca066f25d4cfbf960fc319157d6f80f93bdbf0a0
Review candidates in this agency
| Rank | Part | Words | Score |
|---|---|---|---|
| 23 | 21 CFR 111
CURRENT GOOD MANUFACTURING PRACTICE IN MANUFACTURING, PACKAGING, LABELING, OR HOLDING OPERATIONS FOR DIETARY SUPPLEMENTS
High signals: Directive share
+2.4 SD · Paperwork share
+2.2 SD · Restriction density
+1.6 SD · Reading grade
+1.5 SD |
15,693 | 1.59 |
| 30 | 21 CFR 1003
NOTIFICATION OF DEFECTS OR FAILURE TO COMPLY
High signals: Paperwork share
+3.4 SD · Directive share
+2.5 SD · Restriction density
+1.7 SD · Reading grade
+1.5 SD |
2,076 | 1.52 |
| 31 | 21 CFR 106
INFANT FORMULA REQUIREMENTS PERTAINING TO CURRENT GOOD MANUFACTURING PRACTICE, QUALITY CONTROL PROCEDURES, QUALITY FACTORS, RECORDS AND REPORTS, AND NOTIFICATIONS
High signals: Directive share
+2.5 SD · Paperwork share
+1.9 SD · Reading grade
+1.6 SD · Restriction density
+1.4 SD |
17,241 | 1.51 |
| 56 | 21 CFR 211
CURRENT GOOD MANUFACTURING PRACTICE FOR FINISHED PHARMACEUTICALS
High signals: Directive share
+2.8 SD · Restriction density
+2.8 SD |
12,013 | 1.31 |
| 64 | 21 CFR 99
DISSEMINATION OF INFORMATION ON UNAPPROVED/NEW USES FOR MARKETED DRUGS, BIOLOGICS, AND DEVICES
High signals: Paperwork share
+3.0 SD · Reading grade
+2.4 SD · Directive share
+1.2 SD |
7,256 | 1.28 |
| 113 | 21 CFR 21
PROTECTION OF PRIVACY
High signals: Paperwork share
+3.1 SD |
10,681 | 1.11 |
| 115 | 21 CFR 507
CURRENT GOOD MANUFACTURING PRACTICE, HAZARD ANALYSIS, AND RISK-BASED PREVENTIVE CONTROLS FOR FOOD FOR ANIMALS
High signals: Reading grade
+2.5 SD · Directive share
+1.3 SD · Size
+1.1 SD |
20,674 | 1.11 |
| 145 | 21 CFR 225
CURRENT GOOD MANUFACTURING PRACTICE FOR MEDICATED FEEDS
High signals: Restriction density
+2.7 SD · Directive share
+1.8 SD · Paperwork share
+1.6 SD |
4,046 | 1.06 |
| 159 | 21 CFR 803
MEDICAL DEVICE REPORTING
High signals: Paperwork share
+3.7 SD |
10,544 | 1.05 |
| 214 | 21 CFR 610
GENERAL BIOLOGICAL PRODUCTS STANDARDS
High signals: Directive share
+1.9 SD · Restriction density
+1.1 SD |
10,665 | 0.97 |
| 257 | 21 CFR 108
EMERGENCY PERMIT CONTROL
High signals: Paperwork share
+1.4 SD · Directive share
+1.4 SD |
6,299 | 0.92 |
| 317 | 21 CFR 900
MAMMOGRAPHY
High signals: Restriction density
+1.6 SD · Directive share
+1.4 SD · Size
+1.2 SD |
23,624 | 0.87 |
| 321 | 21 CFR 640
ADDITIONAL STANDARDS FOR HUMAN BLOOD AND BLOOD PRODUCTS
High signals: Restriction density
+2.5 SD · Directive share
+2.1 SD |
14,281 | 0.87 |
| 352 | 21 CFR 502
COMMON OR USUAL NAMES FOR NONSTANDARDIZED ANIMAL FOODS
High signals: Directive share
+2.5 SD · Restriction density
+1.7 SD |
1,006 | 0.84 |
| 407 | 21 CFR 113
THERMALLY PROCESSED LOW-ACID FOODS PACKAGED IN HERMETICALLY SEALED CONTAINERS
High signals: Restriction density
+2.6 SD · Directive share
+1.2 SD |
18,371 | 0.81 |
| 448 | 21 CFR 213
CURRENT GOOD MANUFACTURING PRACTICE FOR MEDICAL GASES
High signals: Restriction density
+2.8 SD · Directive share
+2.2 SD · Paperwork share
+1.2 SD |
6,989 | 0.79 |
| 454 | 21 CFR 1002
RECORDS AND REPORTS
High signals: Paperwork share
+2.6 SD |
4,328 | 0.79 |
| 457 | 21 CFR 226
CURRENT GOOD MANUFACTURING PRACTICE FOR TYPE A MEDICATED ARTICLES
High signals: Restriction density
+1.5 SD · Directive share
+1.3 SD · Paperwork share
+1.3 SD |
2,648 | 0.78 |
| 486 | 21 CFR 515
MEDICATED FEED MILL LICENSE
High signals: Paperwork share
+2.2 SD · Reading grade
+1.4 SD |
2,618 | 0.77 |
| 500 | 21 CFR 821
MEDICAL DEVICE TRACKING REQUIREMENTS
High signals: Reading grade
+2.1 SD · Paperwork share
+1.2 SD |
3,820 | 0.76 |
| 506 | 21 CFR 205
GUIDELINES FOR STATE LICENSING OF WHOLESALE PRESCRIPTION DRUG DISTRIBUTORS
High signals: Directive share
+1.6 SD · Restriction density
+1.3 SD |
2,828 | 0.76 |
| 521 | 21 CFR 101
FOOD LABELING
High signals: Size
+2.6 SD · Reading grade
+1.1 SD |
116,658 | 0.75 |
| 542 | 21 CFR 501
ANIMAL FOOD LABELING
High signals: Directive share
+1.4 SD |
11,855 | 0.75 |
| 563 | 21 CFR 1
GENERAL ENFORCEMENT REGULATIONS
High signals: Size
+2.4 SD · Paperwork share
+1.1 SD |
102,393 | 0.74 |
| 598 | 21 CFR 807
ESTABLISHMENT REGISTRATION AND DEVICE LISTING FOR MANUFACTURERS AND INITIAL IMPORTERS OF DEVICES
High signals: Reading grade
+1.8 SD · Paperwork share
+1.1 SD |
11,144 | 0.72 |
Score: the mean of six signals, in standard deviations (SD). Across the CFR, the top 641 of 6,402 ranked parts (10%) get a flag for review; this list shows 25. A flag is not a finding.
Statutes behind the most text
- 21 U.S.C. 321: 1,639,208 words in 145 parts (59.2% of this agency's text)
- 21 U.S.C. 351: 523,210 words in 30 parts (18.9% of this agency's text)
- 42 U.S.C. 216: 361,918 words in 25 parts (13.1% of this agency's text)
- 42 U.S.C. 243: 194,288 words in 6 parts (7.0% of this agency's text)
- 21 U.S.C. 360b: 155,221 words in 7 parts (5.6% of this agency's text)
- 15 U.S.C. 1453: 132,144 words in 3 parts (4.8% of this agency's text)
- 15 U.S.C. 1333: 104,584 words in 2 parts (3.8% of this agency's text)
- 19 U.S.C. 1490: 102,393 words in 1 parts (3.7% of this agency's text)
- 15 U.S.C. 1451: 83,833 words in 9 parts (3.0% of this agency's text)
- 21 U.S.C. 331: 81,241 words in 9 parts (2.9% of this agency's text)
From the authority notes. A citation is not proof that the statute requires the rule.
Largest parts
- 21 CFR 101: FOOD LABELING (116,658 words)
- 21 CFR 866: IMMUNOLOGY AND MICROBIOLOGY DEVICES (103,134 words)
- 21 CFR 1: GENERAL ENFORCEMENT REGULATIONS (102,393 words)
- 21 CFR 177: INDIRECT FOOD ADDITIVES: POLYMERS (74,752 words)
- 21 CFR 558: NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS (74,395 words)
- 21 CFR 520: ORAL DOSAGE FORM NEW ANIMAL DRUGS (70,841 words)
- 21 CFR 184: DIRECT FOOD SUBSTANCES AFFIRMED AS GENERALLY RECOGNIZED AS SAFE (69,642 words)
- 21 CFR 314: APPLICATIONS FOR FDA APPROVAL TO MARKET A NEW DRUG (68,078 words)
- 21 CFR 178: INDIRECT FOOD ADDITIVES: ADJUVANTS, PRODUCTION AIDS, AND SANITIZERS (67,579 words)
- 21 CFR 201: LABELING (64,094 words)
Reading grade and sentence types are approximate. Simple rules label each sentence; the first match wins.