13 out of 40 = 32.50% (F)
A score of 13/40 is 32.50% — an F on the standard grading scale. Use the calculator below to see the full chart for every possible score, or adjust the scale to match your district's cutoffs.
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| # | Score | Percentage | Grade |
|---|---|---|---|
| 1 | 40 / 40 | 100.0% | A |
| 2 | 39 / 40 | 97.5% | A |
| 3 | 38 / 40 | 95.0% | A |
| 4 | 37 / 40 | 92.5% | A |
| 5 | 36 / 40 | 90.0% | A |
| 6 | 35 / 40 | 87.5% | B |
| 7 | 34 / 40 | 85.0% | B |
| 8 | 33 / 40 | 82.5% | B |
| 9 | 32 / 40 | 80.0% | B |
| 10 | 31 / 40 | 77.5% | C |
| 11 | 30 / 40 | 75.0% | C |
| 12 | 29 / 40 | 72.5% | C |
| 13 | 28 / 40 | 70.0% | C |
| 14 | 27 / 40 | 67.5% | D |
| 15 | 26 / 40 | 65.0% | D |
| 16 | 25 / 40 | 62.5% | D |
| 17 | 24 / 40 | 60.0% | D |
| 18 | 23 / 40 | 57.5% | F |
| 19 | 22 / 40 | 55.0% | F |
| 20 | 21 / 40 | 52.5% | F |
| 21 | 20 / 40 | 50.0% | F |
| 22 | 19 / 40 | 47.5% | F |
| 23 | 18 / 40 | 45.0% | F |
| 24 | 17 / 40 | 42.5% | F |
| 25 | 16 / 40 | 40.0% | F |
| 26 | 15 / 40 | 37.5% | F |
| 27 | 14 / 40 | 35.0% | F |
| 28 | 13 / 40 | 32.5% | F |
| 29 | 12 / 40 | 30.0% | F |
| 30 | 11 / 40 | 27.5% | F |
| 31 | 10 / 40 | 25.0% | F |
| 32 | 9 / 40 | 22.5% | F |
| 33 | 8 / 40 | 20.0% | F |
| 34 | 7 / 40 | 17.5% | F |
| 35 | 6 / 40 | 15.0% | F |
| 36 | 5 / 40 | 12.5% | F |
| 37 | 4 / 40 | 10.0% | F |
| 38 | 3 / 40 | 7.5% | F |
| 39 | 2 / 40 | 5.0% | F |
| 40 | 1 / 40 | 2.5% | F |
| 41 | 0 / 40 | 0.0% | F |
Trusted by innovative teachers at
Whole-chart grade calculator
Every score, every percentage, every letter grade — in one view
Traditional EZ graders give you one number at a time. This one renders the full lookup table so you can grade a stack of papers without re-entering the total every row.
Full chart from 0/N to N/N instantly
Percentage and letter grade per row
Half-point increment mode (0.5-point rubrics)
Rounding control: up / down / nearest / none
25-point scale · standard 90/80/70/60 cutoffs
| Score | Percentage | Grade |
|---|---|---|
| 25/25 | 100% | A |
| 23/25 | 92% | A |
| 21/25 | 84% | B |
| 19/25 | 76% | C |
| 17/25 | 68% | D |
Your grading scale, your rules
Custom cutoffs, your district's scale
Districts use different A/B/C cutoffs. Some use 90/80/70/60, some use 93/85/77/70. Set yours once and the chart recolors. Print a PDF for your binder or tape a short version inside your gradebook.
Override A/B/C/D cutoffs to any values
Instant recolor as you adjust
Print full chart as PDF, no watermark
Stateless — nothing saved, nothing tracked
Total points: 1 to 1,000
From exit tickets to finals
Custom letter cutoffs
90/80/70 or 93/85/77
Half-point increments
0.5-point rubrics
Rounding modes
Up, down, nearest, or none
Print the full chart
No watermark, no branding
Stateless & private
Nothing saved, nothing tracked
Designed for real classrooms
Every detail, handled
The small details that make a grade calculator actually usable when you have 28 quizzes to grade between periods.
- Works offline after load
- Pure client-side math. Once the page loads, you can grade with no internet.
- Any point total
- From a 5-question exit ticket to a 200-point final. Changes the chart instantly.
- Custom letter cutoffs
- Set A/B/C/D thresholds to match your district or classroom scale.
- Print-ready PDF
- Tape a chart inside your gradebook or hand one to a substitute.
About this tool
13 out of 40 = 32.50% (F)
A score of 13 out of 40 is 32.50% — an F on the standard 90/80/70/60 grading scale (failing). Below is a complete breakdown: how the percentage is calculated, what letter grade districts typically assign, and a full lookup chart for every possible score on a 40-point test so you can grade a full stack without re-running the math.
How 13/40 becomes 32.50%
Divide the points earned by the points possible, then multiply by 100: 13 ÷ 40 × 100 = 32.50%. That fraction converts to an F on most US grading scales (A = 90+, B = 80-89, C = 70-79, D = 60-69, F below 60). Some districts use slightly different cutoffs (93/85/77/70); check yours before entering the grade, because a 32.50% can land on either side of the next-letter boundary depending on the scale.
13 correct out of 40 possible
27 missed out of 40 (67.5%)
Percentage: 32.50%
Letter grade (90/80/70/60 scale): F
What an F on a 40-point test means for students
Failing on this assignment. For a teacher pacing a unit, a class-average 32.50% suggests the cohort has a significant gap — pause the pacing plan and reteach the core concepts before moving forward. For an individual student, it's a single data point — pair it with formative checks to decide whether it reflects a one-off or a pattern.
Full lookup chart for 40-point tests
The EZ Grader above renders the complete score-to-percentage-to-letter-grade chart for any point total. Change the total to something else (a 25-point quiz, a 100-point final), adjust letter-grade cutoffs to match your district, and print a clean PDF for the substitute folder or tape it inside your gradebook. Everything runs client-side — nothing saved, nothing tracked.
Grade the rest of the stack just as fast
The EZ Grader is free forever. If you're grading open-response work — essays, short answers, lab reports — where a raw percentage isn't enough, GradeWithAI scores handwritten and digital student work against your rubric in seconds. Same company, same sign-up-free experience. Use EZ Grader for the raw math, GradeWithAI for the rubric-based work.
How it works
Total points in, grading chart out
- 1
Enter total points
Type the number of questions or points on the test. The full chart renders immediately.
- 2
Adjust the scale
Change letter-grade cutoffs, rounding, or half-point increments to match your district's conventions.
- 3
Grade or print
Look up each score, or print the chart and tape it to your desk. Works offline once the page has loaded.
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After the quiz
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EZ Grader handles the math. When you need to grade open-response work — essays, short answers, lab writeups — GradeWithAI scores handwritten and digital student work against your rubric in seconds.
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Graded 28 essays
Period 4 · 92% class average · 14 seconds
Ava G.
9/10
Marcus R.
10/10
Priya S.
8/10
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13 out of 40 is 32.50%, which is an F on the standard 90/80/70/60 grading scale. Some districts use 93/85/77/70 cutoffs — check your school's specific scale.
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