{
  "schemaVersion": "1.0.0",
  "name": "JEE Main 2026 Percentile-to-CRL Planning Model",
  "modelVersion": "jee-main-2026-nta-count-heuristic-v1",
  "status": "published-low-confidence",
  "examYear": 2026,
  "publishedDate": "2026-09-03",
  "lastReviewed": "2026-09-03",
  "dataThrough": "2026-04-20",
  "intendedUse": "Historical scale-check and broad planning interval from a final Paper 1 Total NTA Score percentile. The official Common Rank List always overrides this heuristic.",
  "prohibitedUses": [
    "Official CRL replacement",
    "Category-rank estimation",
    "JoSAA or CSAB choice submission",
    "Admission-chance prediction",
    "Raw-marks conversion"
  ],
  "officialInputs": {
    "sessionOneAppeared": 1304653,
    "sessionTwoAppeared": 1034330,
    "appearedInBothSessions": 800516,
    "officialUniqueAppeared": 1538468,
    "arithmeticUniqueAppeared": 1538467,
    "reconciliationDifference": 1,
    "hundredPercentileCandidates": 26
  },
  "method": {
    "name": "official-count-cohort-position-heuristic",
    "populationShareAbove": "(100 - percentile) / 100",
    "bestRank": "floor(max(sessionOneAbove, sessionTwoAbove, sessionOneAbove + sessionTwoAbove - appearedInBothSessions, 26)) + 1",
    "baselineRank": "floor(populationShareAbove * officialUniqueAppeared) + 1",
    "worstRank": "ceil(min(max(sessionOneAbove + sessionTwoAbove, 26), officialUniqueAppeared - 1)) + 1",
    "perfectPercentileRule": "A percentile of 100 returns the unresolved band 1-26, with no single predicted rank."
  },
  "rangeLabels": {
    "bestRank": "Lower numerical heuristic estimate; not a guaranteed lower bound",
    "baselineRank": "Official-cohort position heuristic",
    "worstRank": "Upper numerical heuristic estimate; not a guaranteed upper bound"
  },
  "sampleOutputs": [
    { "percentile": 100, "bestRank": 1, "baselineRank": null, "worstRank": 26 },
    { "percentile": 99.9, "bestRank": 1305, "baselineRank": 1539, "worstRank": 2340 },
    { "percentile": 99.5, "bestRank": 6524, "baselineRank": 7693, "worstRank": 11696 },
    { "percentile": 99, "bestRank": 13047, "baselineRank": 15385, "worstRank": 23391 },
    { "percentile": 98, "bestRank": 26094, "baselineRank": 30770, "worstRank": 46781 },
    { "percentile": 95, "bestRank": 65233, "baselineRank": 76924, "worstRank": 116951 },
    { "percentile": 93.4123549, "bestRank": 85946, "baselineRank": 101349, "worstRank": 154085 },
    { "percentile": 90, "bestRank": 130466, "baselineRank": 153847, "worstRank": 233900 },
    { "percentile": 80, "bestRank": 260931, "baselineRank": 307694, "worstRank": 467798 }
  ],
  "limitations": [
    "NTA does not publish a complete 2026 percentile-to-CRL conversion table.",
    "NTA calculates percentiles separately within each examination shift.",
    "Best-of-two-session scoring changes the final ranked population.",
    "Subject percentiles and response-based tie-breakers can change the official CRL.",
    "The official unique-appeared count differs by one from session one plus session two minus common candidates; the official total is retained."
  ],
  "sources": [
    {
      "authority": "National Testing Agency",
      "label": "JEE Main 2026 Paper 1 final result notice and candidate counts",
      "url": "https://www.nta.ac.in/Download/Notice/Notice_20260420194021.pdf"
    },
    {
      "authority": "National Testing Agency",
      "label": "JEE Main 2026 Information Bulletin: percentile procedure, best Total NTA Score and tie-breaking rules",
      "url": "https://cdnbbsr.s3waas.gov.in/s3f8e59f4b2fe7c5705bf878bbd494ccdf/uploads/2025/11/202511021649722475.pdf"
    }
  ],
  "canonicalPage": "https://admissionguardian.com/research/jee-main-percentile-to-rank-model",
  "tool": "https://admissionguardian.com/exams/jee-main/rank-predictor",
  "termsOfUse": "https://admissionguardian.com/terms"
}