Test Score Calculator
Exam percentage from correct answers, the mark on any scale, and how many answers a pass needs.
Results
Percentage
85.000
%
Mark on the scale
17.00
Margin
35.000
%
Correct answers
20
Wrong answers
6
What this tool does
The scale field converts the percentage to whatever your school uses — 20 in Portugal and France, 10 in Spain, 100 or a letter grade elsewhere. The fourth result works backwards and tells you the minimum number of correct answers that clears the pass mark, which is the question people are usually really asking.
Formula
mark = certain ÷ total × 100
Variables
| Symbol | Meaning | Unit |
|---|---|---|
co | Correct answers | — |
tq | Total questions | — |
pm | Pass mark | % |
sc | Top of the marking scale | — |
PC | Percentage | % |
GR | Mark on the scale | — |
MA | Margin | % |
NE | Correct answers | — |
WR | Wrong answers | — |
Worked example
- Correct answers34
- Total questions40
- Pass mark50 %
- Top of the marking scale20
- Percentage85.000 %
- Mark on the scale17.00
- Margin35.000 %
- Correct answers20
- Wrong answers6
Limitations
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.