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Final Grade Calculator

Solves the weighted-average grade equation for the final exam score required to reach a desired overall grade, given the current grade and the final's weight, and reports whether that score is achievable.

When to use

You know your current course grade and the final exam's weight and want the minimum final score for a target grade.

Do not use when: Grades are combined by points or categories rather than a percentage weight (compute the weighted mean directly with weighted-average), or you need a GPA (use gpa).

Formula

w = final_weight_percent / 100; required = (desired_grade_percent − current_grade_percent × (1 − w)) / w; max = current × (1 − w) + 100 × w; min = current × (1 − w)

Inputs

Parameter	Type	Unit	Required	Description
`current_grade_percent`	number	%	yes	Current weighted grade over all work except the final, in percent. Range: ≥ 0, ≤ 150
`final_weight_percent`	number	%	yes	Share of the overall grade determined by the final exam. Range: > 0, ≤ 100
`desired_grade_percent`	number	%	yes	Overall grade you want to end up with. Range: ≥ 0, ≤ 150

Outputs

Output	Type	Unit	Description
`required_final_percent`	number	%	Minimum score on the final; can be below 0 or above 100.
`achievable`	boolean		true when the required score is at most 100 %.
`assessment`	string		Plain-language feasibility of the target.
`max_possible_grade_percent`	number	%	Overall grade with 100 % on the final.
`min_possible_grade_percent`	number	%	Overall grade with 0 % on the final.

Example

85 % now, final worth 30 %, want 90 %: {"current_grade_percent":85,"final_weight_percent":30,"desired_grade_percent":90} → {"required_final_percent":101.67,"achievable":false,"max_possible_grade_percent":89.5,"min_possible_grade_percent":59.5}

78 % now, final worth 40 %, want 80 %: {"current_grade_percent":78,"final_weight_percent":40,"desired_grade_percent":80} → {"required_final_percent":83,"achievable":true,"max_possible_grade_percent":86.8,"min_possible_grade_percent":46.8}

GET https://tttkmbb.com/api/v1/calculate/final-grade?current_grade_percent=85&final_weight_percent=30&desired_grade_percent=90

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/final-grade (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/final-grade · Markdown: https://tttkmbb.com/everyday/final-grade.md · JSON definition: https://tttkmbb.com/everyday/final-grade.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="final-grade"
OpenAPI operationId: calculate_required_final_grade
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

Weighted arithmetic mean (Wikipedia) (reference)

FAQ

What is 'current grade'?

Your weighted average over everything graded so far, expressed as a percentage of the non-final portion; many learning platforms show it as the running course grade.

The required score is above 100 %. What now?

The target is out of reach without extra credit; max_possible_grade_percent shows the best you can still achieve.

Related calculators

GPA Calculator — Combine course grades into a GPA.
Weighted Average Calculator — Weighted mean of several assessment categories.