{
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  "tool_id": "gpa-to-letter",
  "engine": "gpa-letter",
  "calculation_version": "1.1.2",
  "generated_at": "2026-09-16T22:03:43.767Z",
  "engine_build": "2026-09-15",
  "test_count": 16,
  "passed": 16,
  "failed": 0,
  "tests_summary": {
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      "total": 16,
      "passed": 16
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    "boundary": {
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  "internally_reviewed": false,
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  "reviewer_role": null,
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  "expert_review": {
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    "scope": [
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      "sources",
      "tests"
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    "note": "Domain expert review is optional under CVP (CVP-EXP-01). Absence does not block CVP Verified. See Review policy for supplemental domain assurance."
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    "status": "not_applicable",
    "reviewer": null
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  "page": "https://www.calculatorx.com/calc/grade/gpa-to-letter",
  "api": "https://www.calculatorx.com/api/v1/calc/gpa-to-letter",
  "schema_input": "https://www.calculatorx.com/schemas/education.gpa_letter.input.json",
  "schema_output": "https://www.calculatorx.com/schemas/education.gpa_letter.output.json",
  "assumptions": [
    "Default plus/minus map uses A+=4.33 … F=0.",
    "Percentage ranges are one common U.S. syllabus convention for the matched letter, not a function of the input GPA.",
    "Linear 5.0 assumes a 5.0 numeric ceiling linearly mapped to 4.0. It is not a generic weighted→unweighted GPA conversion.",
    "Nearest matching is an approximation algorithm, not a registrar rule for converting cumulative GPA back into a letter."
  ],
  "limitations": [
    "Interpretation of a numeric GPA or a single letter — not a registrar conversion",
    "Not a term or cumulative GPA from a course list (use the GPA calculator)",
    "Example percentage bands are syllabus conventions, not derived from GPA"
  ],
  "boundary_conditions": [
    "Plus/minus 4.33 requires 0 ≤ GPA ≤ 4.33; values outside that range are a validation error (not clamped).",
    "Flat 4.0 requires 0 ≤ GPA ≤ 4.00.",
    "Linear 5.0 requires 0 ≤ GPA ≤ 5.00, then scales by 4/5 before letter match.",
    "Nearest ties (equal distance to two grade points) prefer the higher letter, including 3.50 → A-, 3.835 → A, and 4.165 → A+ on plus/minus 4.33."
  ],
  "sources": [
    {
      "title": "University of Alabama — Grades and Grade Points",
      "section": "A+ = 4.33; A = 4.00; A− = 3.67; B+ = 3.33; … F = 0.00",
      "url": "https://catalog.ua.edu/undergraduate/about/academic-regulations/records/grades-grade-points-gpa/",
      "supports": "Published plus/minus 4.33 grade-point map used as this calculator’s default reference model",
      "kind": "reference",
      "accessed": "2026-08-18"
    },
    {
      "title": "Arizona State University Registrar — Grades and grading policies",
      "section": "A+ = 4.33 on the grading scale, but cumulative GPA is capped at 4.00",
      "url": "https://registrar.asu.edu/grades",
      "supports": "Same 4.33 letter points can still differ in how cumulative GPA is reported",
      "kind": "reference",
      "accessed": "2026-08-18"
    },
    {
      "title": "Simon Fraser University SIAT — Recommended grading scale",
      "section": "A− = 85–89.5% with A− = 3.67 grade points (not 90–92%)",
      "url": "https://www.sfu.ca/siat/programs/undergraduate/current-students/student-resources/grading-scale.html",
      "supports": "Percentage bands are school-specific even when grade points match 4.33 / 4.00 / 3.67",
      "kind": "reference",
      "accessed": "2026-08-18"
    },
    {
      "title": "University of California Admissions — GPA requirement",
      "section": "A/B/C/D map to 4/3/2/1, then extra honors/AP/IB points are added with a honors-point cap",
      "url": "https://admission.universityofcalifornia.edu/admission-requirements/first-year-requirements/gpa-requirement.html",
      "supports": "Why Linear 5.0 must not be described as a generic weighted→unweighted GPA conversion",
      "kind": "reference",
      "accessed": "2026-08-18"
    },
    {
      "title": "Randolph College Physics — Grade Scale",
      "section": "A+ = 97–100; A = 93–96; A− = 90–92; B+ = 87–89; … D− = 60–62; F = 0–59",
      "url": "https://physics.randolphcollege.edu/psheldon/classes/gradescale.html",
      "supports": "The example percentage-band table shown by this calculator (a published syllabus convention, not universal)",
      "kind": "reference",
      "accessed": "2026-08-18"
    },
    {
      "title": "St. Olaf College — Typical Grading Scale (Jill Dietz)",
      "section": "97–100% A/A+; 93–96% A; 90–92% A−; 87–89% B+; … 60–62% D−; <60% F",
      "url": "https://pages.stolaf.edu/dietz/typical-grading-scale/",
      "supports": "Independent published example of the same 97–100 / 93–96 / 90–92 syllabus convention",
      "kind": "reference",
      "accessed": "2026-08-18"
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