Education
Grade Calculator
Enter a test score to get the percentage and letter grade. Count right or wrong answers, tune the grading scale to match your school, and read every possible score off the quick chart.
Enter the score
Everything the test is out of
How many the student missed
B
83.33%
15 correct · 3 wrong · out of 18
0%FDCBA100%
No sign-up · Free
The basics
What a grade actually is
A grade is just a fraction made readable. You take the points a student earned, divide by the points the test was worth, and turn that share into a percentage. The percentage then maps onto a letter so a score means the same thing across assignments of different lengths — a 9/10 quiz and a 45/50 exam are both 90%, both an A−.
grade % = correct ÷ total × 100
From points to a percent
Dividing the points earned by the points possible turns a raw score into a share, then scaling it gives a percent — comparable no matter how long the test was.
45 / 50 = 0.9 → 90%
grade % → letter band
From a percent to a letter
The percentage falls into a band on the grading scale, and that band is the letter. Where the bands sit is a policy choice — which is why you can change them here.
90% → A−
Method
Grade any test by hand
Three steps, whether you're marking right answers or just the misses.
- 1
Count what counts
Tally the points earned. If you only marked the wrong answers, subtract them from the total to get the points earned.
correct = total − wrong - 2
Turn it into a percent
Divide the points earned by the total possible, then multiply by 100.
grade % = correct ÷ total × 100 - 3
Read off the letter
Find the band your percentage lands in on the grading scale. That band is the letter grade.
83.33% → B
Quick chart
“What grade is X out of Y?”
The fastest way to grade a whole stack. Set the total and read off every score at a glance — each one with its percentage and letter.
Test is out of
On the US standard A–F scale (with +/−)25 / 25
100%
24 / 25 (1 wrong)
96%
23 / 25 (2 wrong)
92%
22 / 25 (3 wrong)
88%
21 / 25 (4 wrong)
84%
20 / 25 (5 wrong)
80%
19 / 25 (6 wrong)
76%
18 / 25 (7 wrong)
72%
17 / 25 (8 wrong)
68%
16 / 25 (9 wrong)
64%
15 / 25 (10 wrong)
60%
14 / 25 (11 wrong)
56%
13 / 25 (12 wrong)
52%
12 / 25 (13 wrong)
48%
11 / 25 (14 wrong)
44%
10 / 25 (15 wrong)
40%
9 / 25 (16 wrong)
36%
8 / 25 (17 wrong)
32%
7 / 25 (18 wrong)
28%
6 / 25 (19 wrong)
24%
5 / 25 (20 wrong)
20%
4 / 25 (21 wrong)
16%
3 / 25 (22 wrong)
12%
2 / 25 (23 wrong)
8%
1 / 25 (24 wrong)
4%
0 / 25 (25 wrong)
0%
The scale
The standard A–F grading scale
The default below is the common US +/− scale. It isn't a law — schools shift the thresholds, drop the pluses and minuses, or move the pass line. The scale editor in the calculator changes all of this; the quick chart and result update to match.
A+97–100%
A93–96%
A−90–92%
B+87–89%
B83–86%
B−80–82%
C+77–79%
C73–76%
C−70–72%
D+67–69%
D63–66%
D−60–62%
Fbelow 60%
Worth knowing
A few things that trip people up
89.5% → A− or B+?
Rounding lives at the edges
Half a point can flip a letter. Round-half-up nudges a score into the next band, while a school that truncates leaves it where it sits. Decide the policy before the boundary cases arrive.
round-half-up → 90% (A−)
weighted = Σ (score × weight)
Weighted ≠ a simple average
When categories carry different weight, average the weighted parts, not the raw scores — a heavy final pulls the result toward itself.
90% × 0.4 + 80% × 0.6 = 84%
passing = policy, not a fixed %
Passing is a policy, not a number
A passing line is a choice, not a constant. Most courses pass at the low D, but some demand a C to earn credit or count toward a major. Match yours with the scale presets.
most pass at 60% · some need a C (70%)
grade = fraction earned
It's a share, not a count
The number of questions doesn't matter — only the fraction earned. That's why a percentage lets you compare a short quiz and a long final on the same footing.
9 / 10 = 45 / 50 = 90%
FAQ
Common questions
Divide the points earned by the total points possible, then multiply by 100. A 45 out of 50 is 45 ÷ 50 = 0.9, and 0.9 × 100 = 90%.
Convert the score to a percentage, then read off the letter on your grading scale. On the standard US scale 90–100% is an A, 80–89% a B, 70–79% a C, 60–69% a D, and below 60% an F. The quick chart above lists every score for any test length.
On a +/− scale each letter splits into three: the top of the range gets a plus, the bottom a minus. For an A that is A+ 97–100, A 93–96, A− 90–92. Toggle +/− grades off in the scale editor if your school uses whole letters only.
On the standard US scale an A is 93–96%, with A− at 90–92% and A+ at 97% and up. Many schools treat anything 90% and above as an A when they don't use +/− grades.
Most US schools set the pass line at 60% (a D−). Some courses require a C (70%) to pass or to count toward a major. Use the Pass at 50% or Pass at 65% presets in the scale editor to match a different policy.
Flip the toggle to Count wrong and enter how many the student missed — the calculator subtracts from the total for you. It's the fastest way to grade a stack of papers where you only mark mistakes.
It can at the boundaries. An 89.5% rounds to 90% (an A−) under round-half-up, but stays a B+ if the school truncates. This calculator shows two decimals so you can see exactly where a score lands before any rounding policy.
Multiply each category's percentage by its weight as a decimal, then add the results. Homework at 90% (weight 0.4) and exams at 80% (weight 0.6) give 90 × 0.4 + 80 × 0.6 = 84%.
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Author
Ugo CharlesBuilt and fact-checked against our editorial standards · Last updated June 2026
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