Score converter
Turn a score out of 15, 25, 30, 50 or any other total into a percentage, a letter grade or another scale, with the rounding you choose and the full chart to print.
| Score out of 50 | Out of 100 | Percentage | Grade |
|---|---|---|---|
| 0 | 0 | 0 | F |
| 1 | 2 | 2 | F |
| 2 | 4 | 4 | F |
| 3 | 6 | 6 | F |
| 4 | 8 | 8 | F |
| 5 | 10 | 10 | F |
| 6 | 12 | 12 | F |
| 7 | 14 | 14 | F |
| 8 | 16 | 16 | F |
| 9 | 18 | 18 | F |
| 10 | 20 | 20 | F |
| 11 | 22 | 22 | F |
| 12 | 24 | 24 | F |
| 13 | 26 | 26 | F |
| 14 | 28 | 28 | F |
| 15 | 30 | 30 | F |
| 16 | 32 | 32 | F |
| 17 | 34 | 34 | F |
| 18 | 36 | 36 | F |
| 19 | 38 | 38 | F |
| 20 | 40 | 40 | F |
| 21 | 42 | 42 | F |
| 22 | 44 | 44 | F |
| 23 | 46 | 46 | F |
| 24 | 48 | 48 | F |
| 25 | 50 | 50 | F |
| 26 | 52 | 52 | F |
| 27 | 54 | 54 | F |
| 28 | 56 | 56 | F |
| 29 | 58 | 58 | F |
| 30 | 60 | 60 | D |
| 31 | 62 | 62 | D |
| 32 | 64 | 64 | D |
| 33 | 66 | 66 | D |
| 34 | 68 | 68 | D |
| 35 | 70 | 70 | C |
| 36 | 72 | 72 | C |
| 37 | 74 | 74 | C |
| 38 | 76 | 76 | C |
| 39 | 78 | 78 | C |
| 40 | 80 | 80 | B |
| 41 | 82 | 82 | B |
| 42 | 84 | 84 | B |
| 43 | 86 | 86 | B |
| 44 | 88 | 88 | B |
| 45 | 90 | 90 | A |
| 46 | 92 | 92 | A |
| 47 | 94 | 94 | A |
| 48 | 96 | 96 | A |
| 49 | 98 | 98 | A |
| 50 | 100 | 100 | A |
Everything is computed in your browser; no score and no name is ever sent to a server.
Are these scores from a multiple-choice test? Grade a whole test with Evalmee
How to convert a score
- 01
Enter the score
Type the score as it is written on the paper, decimals included: 37, 12.5 or 88. The converter reads a dot or a comma as the decimal mark.
- 02
Enter the total the test was marked out of
Put in the maximum — 45 if the paper is worth 45 points, 15 if it is marked out of 15. A shortcut chip does it for you on the most common totals.
- 03
Pick the target scale and read the result
The percentage appears at once, with the letter grade beside it. Choose the scale your institution reports on and the rounding it expects, then print the full chart if you are marking a pile of papers.
Convert a score out of 30, 15, 25, 40, 50 or 100
The arithmetic never changes: multiply the score by the scale you want, then divide by the total the test was marked out of. A marking schemeMarking schemeThe rule that converts a candidate's answers into a mark. It sets the number of points per question, any penalties, and the way partial credit is awarded. Published before the exam, it constitutes the examiner's commitment as to what will be rewarded. out of 30 and one out of 100 therefore give the same percentage for the same proportion of correct answers — what differs is granularity: one point out of 30 is worth 3.3 percentage points, one point out of 100 is worth one.
The seven totals below are the ones that come up most often. Each table gives the round equivalences; the converter at the top of the page builds the complete chart, row by row, for any total you type.
Score out of 10
A score out of 10 becomes a percentage by multiplying it by ten: 7 out of 10 is 70 %, 8.5 out of 10 is 85 %. It is the only total that converts in your head, which is why short quizzes are so often marked this way.
| Score out of 10 | Percentage | Letter grade |
|---|---|---|
| 0 | 0 % | F |
| 2 | 20 % | F |
| 4 | 40 % | F |
| 5 | 50 % | F |
| 6 | 60 % | D |
| 7 | 70 % | C |
| 8 | 80 % | B |
| 9 | 90 % | A |
| 10 | 100 % | A |
Score out of 15
Multiply by 100 and divide by 15, which is the same as multiplying by 6.67. A score of 13 out of 15 is 86.7 %, a solid B. Fifteen-point totals are common in language papers and in fifteen-question quizzes.
| Score out of 15 | Percentage | Letter grade |
|---|---|---|
| 0 | 0 % | F |
| 3 | 20 % | F |
| 6 | 40 % | F |
| 7.5 | 50 % | F |
| 9 | 60 % | D |
| 10.5 | 70 % | C |
| 12 | 80 % | B |
| 13.5 | 90 % | A |
| 15 | 100 % | A |
Score out of 25
A score out of 25 turns into a percentage by multiplying it by four: 20 out of 25 is 80 %, 23 out of 25 is 92 %. This total shows up whenever a test has twenty-five one-point questions.
| Score out of 25 | Percentage | Letter grade |
|---|---|---|
| 0 | 0 % | F |
| 5 | 20 % | F |
| 10 | 40 % | F |
| 12.5 | 50 % | F |
| 15 | 60 % | D |
| 17.5 | 70 % | C |
| 20 | 80 % | B |
| 22.5 | 90 % | A |
| 25 | 100 % | A |
Score out of 30
Multiply by 100 and divide by 30, or equivalently by 3.33. A score of 24 out of 30 is 80 %, and 22 out of 30 is 73.3 %. Thirty-point totals are standard on tests with thirty items.
| Score out of 30 | Percentage | Letter grade |
|---|---|---|
| 0 | 0 % | F |
| 6 | 20 % | F |
| 12 | 40 % | F |
| 15 | 50 % | F |
| 18 | 60 % | D |
| 21 | 70 % | C |
| 24 | 80 % | B |
| 27 | 90 % | A |
| 30 | 100 % | A |
Score out of 40
Out of 40, multiply by 2.5 to get the percentage: 33 out of 40 is 82.5 %. It is the natural total of a forty-question test, or of a paper made of two twenty-point halves.
| Score out of 40 | Percentage | Letter grade |
|---|---|---|
| 0 | 0 % | F |
| 8 | 20 % | F |
| 16 | 40 % | F |
| 20 | 50 % | F |
| 24 | 60 % | D |
| 28 | 70 % | C |
| 32 | 80 % | B |
| 36 | 90 % | A |
| 40 | 100 % | A |
Score out of 50
A score out of 50 doubles into a percentage: 42 out of 50 is 84 %. Marking out of 50 buys half a percentage point of granularity without any decimals in the marking scheme.
| Score out of 50 | Percentage | Letter grade |
|---|---|---|
| 0 | 0 % | F |
| 10 | 20 % | F |
| 20 | 40 % | F |
| 25 | 50 % | F |
| 30 | 60 % | D |
| 35 | 70 % | C |
| 40 | 80 % | B |
| 45 | 90 % | A |
| 50 | 100 % | A |
Score out of 100
A score out of 100 is already a percentage, so the only thing left to read is the letter grade — or the score on another scale. 88 out of 100 is a B, and 17.6 on the French scale out of 20.
| Score out of 100 | Percentage | Letter grade |
|---|---|---|
| 0 | 0 % | F |
| 20 | 20 % | F |
| 40 | 40 % | F |
| 50 | 50 % | F |
| 60 | 60 % | D |
| 70 | 70 % | C |
| 80 | 80 % | B |
| 90 | 90 % | A |
| 100 | 100 % | A |
Grading scale: percentages, letter grades and GPA
The letter scale the converter uses by default is the ordinary American one — A from 90 %, B from 80 %, C from 70 %, D from 60 %, F below. It is a convention, not a law: many schools shift the bands, add plus and minus grades, or set the pass mark at 50 %.
The GPA column is indicative. Grade point averages are computed from an institution's own grade table and weighted by credits, so a single percentage does not determine a GPA on its own. The last column shows the same score on the French twenty-point scale, which is where most European transcripts sit.
| Percentage | Letter grade | Indicative GPA | Score out of 20 |
|---|---|---|---|
| 90 – 100 % | A | 4.0 | 18 – 20 |
| 80 – 89 % | B | 3.0 | 16 – 17.9 |
| 70 – 79 % | C | 2.0 | 14 – 15.9 |
| 60 – 69 % | D | 1.0 | 12 – 13.9 |
| 0 – 59 % | F | 0.0 | 0 – 11.9 |
A printable grading chart for a whole pile of papers
Marking thirty papers out of 45 while converting every score on a calculator is thirty chances to slip. The chart the converter builds has one row per point: print it, lay it next to the pile, and read the percentage opposite each raw total.
The print button hides the input fields and keeps only the chart's title, the table and the page address. Up to a total of sixty points the chart fits on a single A4 or Letter sheet; beyond that it runs onto a second page.
The score conversion formula
Converting a score is a rule of three: multiply the score by the scale you are converting to, then divide by the total the test was marked out of. Round once, at the end — rounding at each step moves the result by a tenth or two.
converted score = raw score × target scale ÷ total marksFrequently asked questions
Multiply the score by 100 and divide by the total the test was marked out of. A paper worth 37 points out of 45 gives 37 × 100 ÷ 45, which is 82.2 %. The same arithmetic works for any target scale: replace 100 with 20, or with 10, and the converter does it for you.
Multiply by the scale you want and divide by 30. Out of 30, a score of 24 is 80 % — a B on the standard American scale — and 22 is 73.3 %, a C. The table in the "Score out of 30" section gives the round equivalences, and the converter builds the full chart point by point.
It depends on what you report. Percentages are usually kept to one decimal or rounded to the whole number; scales out of 20 are commonly rounded to the half point because school software expects it. The converter offers a tenth, a quarter point, a half point, a whole point, and no rounding at all.
On the default American scale, 90 % and above is an A, 80 % a B, 70 % a C, 60 % a D and anything below is an F. Your institution may use different cut-offs, so check its grading policy before reporting a letter. The converter shows the letter beside every percentage in the chart.
There is no official conversion. The most common mapping puts 18 out of 20 at an A, 16 at a B, 14 at a C and 12 at a D, which is a GPA of 4 down to 1. Treat it as indicative: universities and credential evaluators apply their own tables, often more generous, and ask for the original transcript.
No. Everything is computed in your browser; no score and no student name is sent to a server. The last total you used is kept in your browser's local storage so you do not have to retype it, and nothing else is retained.
Yes, with the chart: enter the total the test was marked out of and the converter shows the converted score for every possible raw total. Print it and read the whole pile against it. To convert and store the scores of a whole cohort, that is where Evalmee takes over.
What if the scores calculated themselves?
Evalmee grades closed questions, applies your marking scheme and publishes the whole class's results — with no spreadsheet in between.