Test Score Calculator
Percent, letter grade, and grade points from earned and total points.
What it does
A test score turns raw points into a percent and then into a letter. The percent shows what share of the available points the student earned, and the letter maps that share onto the school grading scale for transcripts and averages.
The tool above takes earned points with total points. It returns the percent to one decimal, the letter on standard US cuts, and the 4 point GPA value, with the points needed for an A in the note.
The example uses 42 out of 50: 84.0%, a B at 3.0 points, needing 45 for the 90% A line. Small totals swing fast: each point here is worth 2%, so two questions decide the letter.
Cutoffs follow the common Core-era classroom scale shared by NCTM teacher resources and Common Core math percent standards. Many schools add plus/minus slices or curves on top, so treat this as the straight scale baseline.
How to use
- Enter the points earned, including partial credit decimals.
- Enter the total points possible on the test.
- Read the percent first for the exact share.
- Read the letter and grade points for the transcript value.
- Use the note to see how many points an A would need.
Formula
- earned
- Points scored with partial credit included.
- total
- Points possible before any curve.
- 90/80/70/60
- Standard straight scale cutoffs used here.
Extra credit can push earned above total in some classes; this page asks for earned at or below total and treats over totals as entry errors so curves stay explicit.
Worked example
Example: 42 out of 50
Earned 42, total 50, straight scale.
- Divide: 42 / 50 = 0.84.
- Percent: 0.84 x 100 = 84.0%.
- Letter: 84.0 sits in 80 to 89.99, so B.
- Points: B maps to 3.0 on the 4 scale.
- A needs 45 (90% of 50), so 3.0 more points. Tool shows 84.0%, B, 3.0.
Reference table
| Letter | Percent | Points |
|---|---|---|
| A | 90 to 100 | 4.0 |
| B | 80 to 89.9 | 3.0 |
| C | 70 to 79.9 | 2.0 |
| D | 60 to 69.9 | 1.0 |
| F | below 60 | 0.0 |
Limits
- Straight scale only. Curves and plus/minus variants differ.
- Weighting across tests needs the final grade page instead.
- Dropped scores must be removed from totals first.
- Extra credit policies vary and sit outside this math.
Common mistakes
- Dividing total by earned instead of earned by total.
- Forgetting partial credit that shifts the letter.
- Assuming plus/minus lines when the class uses straight letters.
- Rounding the percent before comparing to the cutoff.
- Mixing curved and uncurved totals in one average.
Try it yourself
Quick checks. Answers sit tucked under each question.
45 out of 50?
45 / 50 = 90.0%, an A at 4.0 points.
7 out of 10?
70.0%, a C at 2.0 points.
18 out of 20?
90.0%, an A at 4.0 points.
Questions
What grade is 42 out of 50?
84.0%, a B worth 3.0 points on the straight scale.
How do you find percent?
Earned divided by total times 100. Each point on a 50 point test is 2%.
What is 90% of 50?
45 points. That is the A line on this scale.
Do schools use the same cutoffs?
Most use 90/80/70/60 as here, but plus/minus and curves vary by teacher.
How does this affect GPA?
Each course letter maps to points (A 4.0), then the GPA page averages by credits.
What about extra credit?
Add it per syllabus rules first, then enter the adjusted earned value.