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 updated: September 8, 2026 · Formulas verified by automated tests that block every release. Editorial review dates are shown in the sources block above.
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. If the class result comes in low across the board, the raw score isn't the last word — you canapply a grade curve and see what each paper becomes under the method you choose.
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.