GPA ↔ letter grade Calculation Capability

• Nearest: Matched point = nearest gᵢ (ties → higher letter)
• Floor: Matched point = max { gᵢ | gᵢ ≤ GPA }
• Letter: Letter = letter for matched point

Solve modes: to-letter · to-gpa

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.

GPA 3.50, plus/minus, nearest → A- (tie, higher letter)

Open this example in the calculator

• to-letter
• to-gpa

Sources

• University of Alabama — Grades and Grade Points — A+ = 4.33; A = 4.00; A− = 3.67; B+ = 3.33; … F = 0.00
• Arizona State University Registrar — Grades and grading policies — A+ = 4.33 on the grading scale, but cumulative GPA is capped at 4.00
• Simon Fraser University SIAT — Recommended grading scale — A− = 85–89.5% with A− = 3.67 grade points (not 90–92%)
• University of California Admissions — GPA requirement — A/B/C/D map to 4/3/2/1, then extra honors/AP/IB points are added with a honors-point cap
• Randolph College Physics — Grade Scale — A+ = 97–100; A = 93–96; A− = 90–92; B+ = 87–89; … D− = 60–62; F = 0–59
• St. Olaf College — Typical Grading Scale (Jill Dietz) — 97–100% A/A+; 93–96% A; 90–92% A−; 87–89% B+; … 60–62% D−; <60% F

curl -sS -X POST 'https://www.calculatorx.com/mcp' \
  -H 'Content-Type: application/json' \
  -H 'MCP-Protocol-Version: 2026-07-28' \
  -H 'Mcp-Method: tools/call' \
  -H 'Mcp-Name: inspect_capability' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"inspect_capability","arguments":{"capability_id":"education.gpa_letter"}}}'

Inspect the trust tier and required assurance level before execution. Pin calculation_version (1.1.2) when reproducibility matters. Full protocol notes: MCP docs.