Test Grade Calculator
Convert questions wrong into a percentage score and letter grade. This free online education & academic calculator runs entirely in your browser — no signup, no data sent anywhere.
Inputs
Results
How It Works (Formula & Method)
The percentage is the number correct (total minus wrong) divided by the total, times 100. The tool then maps that percentage to a letter using the common US scale (A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, otherwise F).
Worked Example
Below is a worked example using the calculator's default values. The same numbers are pre-filled in the form above so you can press Calculate and see the result without typing anything.
Inputs used:
- Total Questions: 40
- Number Wrong: 5
With these inputs, the calculator computes the metrics shown in the Results panel. Change any value and press Calculate again to see how the result responds — the live widget and the chart both update instantly.
Frequently Asked Questions
What does the Test Grade Calculator compute?
The Test Grade Calculator takes 2 input values and returns 3 results. Turn the number of questions and the number wrong into a percentage score and letter grade — the classic teacher's grading tool.
Is my data sent to a server?
No. The Test Grade Calculator runs entirely in your browser using static JavaScript. Your inputs are never transmitted to CalculatorHive or any third party, and nothing is stored after you close the page.
Is this calculator free to use?
Yes. Every calculator on CalculatorHive is completely free. There is no signup, no paywall, and no usage limit. The site is supported by display advertising and affiliate partnerships, which are clearly labeled.
How accurate is the result?
The math is mathematically exact for the inputs you provide. Real-world accuracy depends on how accurately your inputs reflect the real situation — defaults are typical values, not guarantees.