Test Grade Calculator
Grading a stack of tests, or just got yours back? Total questions, wrong answers — instant percentage and letter grade, with each question's worth spelled out.
📋 Easy grader chart — every score for a 25-question test
Spotted a mistake or have an idea? — errors get fixed and credited publicly.
Last reviewed: July 20, 2026 · Formulas verified by automated tests before every release.
The easy grader chart
Open the chart above the result and you get the classic teacher's grading table: every possible wrong-answer count for your test with its percentage and letter, color-coded. Set the question count once, keep the chart open next to the stack of papers, and grade the whole class without touching a key again.
The teacher's shortcut
Set the total questions once, then just change the wrong-answer count for each paper — the score and letter update instantly. The "each question is worth X points" line also answers the eternal student question at test-design time: 20 questions means every mistake costs a full 5 points, while 50 questions soften each slip to 2.
The standard letter scale
- A range: 90–100% (A- from 90, A from 93, A+ from 97)
- B range: 80–89% · C range: 70–79% · D range: 60–69% · F: below 60%
- Schools vary — some use 7-point ranges or no plus/minus. When your grade sits on a boundary, the syllabus rounding rule decides.
Sources, assumptions and limitations
- Formula: score % = correct ÷ total × 100; the chart maps every wrong-answer count to its percentage and letter
- Assumptions: Equal weight per question; the letter scale shown is the common US 10-point convention (90/80/70/60).
- Not included: Partial credit, weighted questions, curves (use the Grade Curve calculator for those), institution-specific scales.
- Last reviewed: July 22, 2026 by the CalcNotebook team
Frequently asked questions
How do I calculate a test grade from wrong answers?
Score = (total − wrong) ÷ total × 100. Missing 3 of 25 questions gives (25 − 3) ÷ 25 = 88%, a B+ on the standard scale.
What letter grade is my percentage?
The most common US scale: 90–100 A range, 80–89 B, 70–79 C, 60–69 D, below 60 F — with plus/minus splits every ~3 points (93+ A, 87+ B+ etc.). Your school's scale may differ slightly.
How many can I get wrong and still pass?
Multiply the total questions by the pass mark: on a 25-question test with a 60% pass line, you can miss up to 10 questions (25 × 0.4). Teachers: this works in reverse for setting fair test lengths.
Is this for teachers or students?
Both. Students check results instantly; teachers grade whole stacks with it — set the total once and just change the wrong-answer count for each paper.