Test Grade Calculator (Score to Percentage)
Test grade calculator: turn points or correct answers into a percentage and letter grade — or find how many you need for a target score.
g = cn
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
Grade = points earned ÷ points possible. On the usual US scale A ≥ 90 %, B ≥ 80 %, C ≥ 70 %, D ≥ 60 %.
Formula
g = cn
| Symbol | Quantity | Units |
|---|---|---|
| c | Points or correct answers | — |
| n | Total points or questions | — |
| g | Grade | %, × |
Worked example
Given: c = 42 · n = 50
g = cn
Result: g = 84 %
Grade for different values of Points or correct answers
| c · Points or correct answers | g · Grade |
|---|---|
| 21 | 42 % |
| 31.5 | 63 % |
| 37.8 | 75.6 % |
| 42 | 84 % |
| 46.2 | 92.4 % |
| 52.5 | 105 % |
| 63 | 126 % |
| 84 | 168 % |
Other values as in the worked example.
Frequently asked questions
42 out of 50?
84 % — a B.
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