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Test Grade Calculator

Use this test grade calculator to turn points earned and points possible into a percentage score and rough letter grade.

Live calculator

Test grade

Adjusted grade84%

Approximate letter grade: B.

Raw grade84%

42 out of 50 points before curve.

Points missed8

42 adjusted points earned before curve percentage points.

Formula

Test grade formula

Test grade = points earned / points possible x 100; adjusted grade can add extra credit and curve points

Letter grades are approximate because schools and teachers use different scales.

How to use

Steps

  1. Enter the points earned on the test.
  2. Enter the total points possible.
  3. Add extra credit points if they count toward the test.
  4. Add curve percentage points only if your teacher announced a curve.

Example

Sample calculation

Points earned42
Points possible50
Raw grade84%
Letter estimateB

Calculator use

Best for

  • Checking calendar, work-hour, school, deadline, age, or duration math before copying the result elsewhere.
  • Comparing inclusive versus exclusive dates, breaks, grading weights, or time spans with the assumptions visible.

Before relying on it

Check first

  • Mixing inclusive and exclusive date counting, time zones, overnight shifts, unpaid breaks, holidays, or school-specific grading rules.
  • Rounding time or grades too early and then using the rounded result in another calculation.
  • Treating a planning result as payroll, HR, transcript, legal deadline, or official school policy.

Details

What to know before using the result

Letter gradeApproximate scale

The calculator uses a common A/B/C/D/F scale, but your class may use a different cutoff table.

Curve inputPercentage-point adjustment

Enter 5 when a teacher adds five percentage points to every test score.

Extra creditPoint adjustment

Extra credit points are added to earned points before the percentage is calculated.

Source notes

References used for this calculator

Cornell Center for Teaching InnovationDescribes tests, quizzes, and other graded activities as summative assessments.UCLA RegistrarLists institutional grade categories and grade reporting practices.

Benchmarks

How to read the result

90%+: A range.

A common high-score benchmark, though exact cutoffs vary.

80% - 89%: B range.

Often considered a strong passing score in percentage-based classes.

Below 70%: Check policy.

Review retake, curve, dropped-test, or extra-credit options if available.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Test grade = points earned / points possible x 100; adjusted grade can add extra credit and curve points

Inputs used

Points earned, Points possible, Extra credit, Curve points

Limitations

Everyday results are quick planning checks. Unit choices, rounding, labels, measurements, local prices, and real-world constraints can change the final decision.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Test Grade Calculator. https://toolkitshelf.com/tools/test-grade-calculator

FAQ

Common questions

How do I calculate a test grade?

Divide points earned by points possible, then multiply by 100 to get the percentage grade.

How does extra credit affect the score?

Extra credit increases earned points before the calculator divides by possible points and converts the result to a percentage.

Are the letter grades official?

No. Letter grades are approximate because each school, teacher, or syllabus may use different cutoffs.