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Grades & Study Calc – Percent to Letter Grade
x402
Grades & Study Calc – Percent to Letter Grade is a paid API for AI agents from grades-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Converts a percentage score to a US letter grade (with optional plus/minus), 4.0 GPA points, and the points needed to reach the next grade up.
Price / call$0.02
Success—
StatusUnknown
How this service works
Letter grade and 4.0 GPA points for a percentage on the common US scale, with plus/minus, and points to the next grade.
Output
Returns the letter grade (e.g. B+), 4.0 GPA points for that grade, the lowest percentage that earns this letter, how many percentage points are needed to reach the next letter up, whether the grade is typically passing, the percent actually used in the calculation, and metadata like source and summary.
Example use cases
Student checking exam grade
“I scored 91% on my chemistry exam. What letter grade is that with plus/minus, what are my GPA points, and how far am I from bumping up to the next letter?”
Teacher grading without plus/minus
“A student got 74% on their assignment. Using a plain A/B/C/D/F scale with no plus or minus, what letter grade is that and is it passing?”
Borderline score rounding check
“My raw score works out to 89.5% — if my professor rounds half up to the nearest whole percent first, what letter grade and GPA points do I get on the plus/minus scale?”
Technical details
Endpoint
GEThttps://grades-calc.x402tookit.com/percent-to-letter?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, deterministic conversion of a US percentage score to a letter grade with optional plus/minus granularity and GPA points — especially when you also need to know how close the score is to the next grade tier. Prefer it over manual lookup tables or GPA calculators that don't handle plus/minus or proximity to the next grade.
Side effects
- Missing required 'percent' query parameter returns an error
- Percent value outside 0–120 range may return an error or unexpected result
- Invalid plusMinus or roundHalfUp string values may be ignored or cause errors
- Network or service unavailability returns a non-200 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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