Percent score and letter grade from the number wrong, with a chart for every possible score. Runs on your device.
Every possible number wrong on a 20-question test, graded on the 90/80/70/60 scale with no rounding. Each question is worth 5 percent.
| Wrong | Right | Percent | Letter |
|---|---|---|---|
| 0 | 20 | 100% | A |
| 1 | 19 | 95% | A |
| 2 | 18 | 90% | A |
| 3 | 17 | 85% | B |
| 4 | 16 | 80% | B |
| 5 | 15 | 75% | C |
| 6 | 14 | 70% | C |
| 7 | 13 | 65% | D |
| 8 | 12 | 60% | D |
| 9 | 11 | 55% | F |
| 10 | 10 | 50% | F |
| 11 | 9 | 45% | F |
| 12 | 8 | 40% | F |
| 13 | 7 | 35% | F |
| 14 | 6 | 30% | F |
| 15 | 5 | 25% | F |
| 16 | 4 | 20% | F |
| 17 | 3 | 15% | F |
| 18 | 2 | 10% | F |
| 19 | 1 | 5% | F |
| 20 | 0 | 0% | F |
Scale: A 90 and up, B 80, C 70, D 60, F below 60. Schools use other scales; use the calculator for yours.
The letter given to a score at each cut-off percent. A score between two rows takes the letter of the row below it.
| From this percent | 90/80/70/60 scale | Plus and minus scale |
|---|---|---|
| 97 | A | A+ |
| 93 | A | A |
| 90 | A | A- |
| 87 | B | B+ |
| 83 | B | B |
| 80 | B | B- |
| 77 | C | C+ |
| 73 | C | C |
| 70 | C | C- |
| 67 | D | D+ |
| 63 | D | D |
| 60 | D | D- |
| 0 | F | F |
Both scales are common US conventions, not a standard. Check your syllabus for the one your class uses.
To find a test score, subtract the number wrong from the total, divide by the total and multiply by 100. On a 20-question test with 3 wrong, that is (20 − 3) ÷ 20 × 100 = 85%, a B on the usual 90/80/70/60 scale. The same method works for points: a quiz out of 50 points with 8 points lost scores 42 ÷ 50 = 84%. Type the total, choose whether you are counting wrong or right, and the page shows the percent, the letter and the sum, step by step. Totals can be anything from just above 0 up to 300.
Below the answer is a chart with one row for every possible number wrong, from 0 up to the total, with the matching right count, percent and letter. Your own score is marked. It is meant for a teacher with a pile of papers: set the total once, then read each paper's grade off the chart instead of typing it again. The chart also answers planning questions. On a 20-question test the rows show that 2 wrong is still 90%, an A on the plain scale, and 3 wrong drops to 85%. The chart follows the scale, half-point and rounding options you choose.
The default scale is the common US 10-point one: A at 90 and above, B at 80, C at 70, D at 60 and F below 60, with no plus or minus. Switch to Plus and minus for A+ at 97, A at 93, A- at 90, B+ at 87 and so on down to D- at 60. Both are conventions, not a standard, and the page states the scale it used in every result. Turn on half points if you give half credit, and wrong or right counts such as 2.5 are accepted. Round the percent to a whole number first if your class rounds before grading: 89.5% is a B as it stands but an A when rounded to 90%.
This page grades a single test or quiz. It does not weight tests against homework or work out a course average. For that, the Grade Calculator takes scores with weights, and the Final Grade Calculator finds the score you need on the exam to reach a target. The letters here come only from the numbers you type and the scale on screen. Your syllabus decides the grade that counts, including curves, dropped questions and extra credit, none of which is known here.
Subtract the wrong answers from the total, divide by the total and multiply by 100. With 25 questions and 4 wrong, 21 ÷ 25 × 100 = 84%, a B on the 90/80/70/60 scale.
On the plain scale an A needs 90%, so a 20-question test allows 2 wrong, a 50-question test allows 5 and a 100-point test allows 10 points lost. On the plus/minus scale an A needs 93%, so 50 questions allow 3 wrong.
By default A at 90, B at 80, C at 70, D at 60 and F below 60, with no plus or minus. Choose Plus and minus for A+ at 97 down to D- at 60. Your school may differ, so the scale used is written under every result.
Yes. Turn on Allow half points and counts like 2.5 wrong are accepted, and the chart moves in steps of 0.5. On a 20-question test, 2.5 wrong is 17.5 right, 87.5%, a B.
A score of 89.5% is a B as it stands, but it is 90% once rounded to a whole number, which is an A. The option is off by default. A test of 19 questions with 2 wrong is 89.47%, which rounds to 89% and stays a B.
No. This page grades one test and gives a chart for every score. The Grade Calculator averages several scores with weights, for example homework at 20% and a midterm at 30%, and the Final Grade Calculator finds the exam score needed for a target.