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Education & Statistics

Grade Percentage Calculator

Turn points earned into a percentage score and letter grade using a grading scale you can customise.

Your inputs

Adjust to match your school’s scale.

Results

Score

87%

Letter grade
B+
Points missed
13

✓Exact calculation — rounded only for display

What this calculator does

Convert test or assignment points into a percentage and see the matching letter grade.

Formula and method

Score = points earned ÷ points possible × 100; letter = highest boundary the score meets.

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Points earned: 87
  • Points possible: 100
  • Letter grade scale (minimum %:letter): 93:A, 90:A-, 87:B+, 83:B, 80:B-, 77:C+, 73:C, 70:C-, 67:D+, 63:D, 60:D-, 0:F

Results

  • Score: 87%
  • Letter grade: B+
  • Points missed: 13

How to read the results

Scores above 100 % indicate extra credit.

Assumptions and limitations

  • Grading scales and conversion rules differ between schools and countries; adjust the inputs to match your institution’s official policy.

Questions

How do I change the scale?

Edit the list of “minimum %:letter” pairs, e.g. 90:A, 80:B, 70:C.

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
4 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy