Test Grade Calculator

What is a test grade calculator?

A test grade calculator turns your points earned and the total possible points into a percentage and a US letter grade. Instead of dividing and mapping the result to a grade by hand, you type two numbers and the tool returns your score as a percentage, the matching letter grade (A+ down to F), and how many points you missed.

This is the fastest way to answer the question every student and teacher asks after a quiz or exam: “what grade did I get?” The tool works for any point total, not just tests out of 100, so a quiz scored out of 25, a project out of 80, or a final out of 200 all work the same way. Everything runs in your browser, so nothing you enter is uploaded or stored.

How the test grade is calculated

The calculator uses one simple percentage formula:

percentage = earned ÷ total × 100

Here is what each term means:

• Points earned — the raw points you received, such as the marks you scored on a graded test.
• Total points — the maximum points the test was worth, the perfect score.
• Percentage — points earned divided by total points, then multiplied by 100.
• Points missed — total points minus points earned, the gap to a perfect score.

After computing the percentage, the tool maps it to a letter on the standard US plus/minus scale. The mapping is fixed: a score at or above each cutoff earns that grade. For example, 90% or higher but under 93% is an A-, while anything under 60% is an F.

Letter grade scale

This tool uses the common US plus/minus grading scale. Each grade is assigned when your percentage is at or above its cutoff.

Examples

Each example below reproduces the calculator’s output exactly. Percentage is points earned divided by total points, times 100.

Example 1 — a solid B. You scored 42 out of 50.

• Percentage: 42 ÷ 50 × 100 = 84%
• Letter grade: 84% is in the 83 to 86.99 range, so it is a B
• Points missed: 50 − 42 = 8

Example 2 — landing on an A-. You scored 45 out of 50.

• Percentage: 45 ÷ 50 × 100 = 90%
• Letter grade: 90% is exactly the A- cutoff, so it is an A-
• Points missed: 50 − 45 = 5

This shows how cutoffs work: 90% earns the A-, not a straight A. A straight A would need 93% (about 46.5 out of 50).

Example 3 — near perfect. You scored 49 out of 50.

• Percentage: 49 ÷ 50 × 100 = 98%
• Letter grade: 98% is at or above 97%, so it is an A+
• Points missed: 50 − 49 = 1

Example 4 — barely passing. You scored 30 out of 50.

• Percentage: 30 ÷ 50 × 100 = 60%
• Letter grade: 60% is exactly the D- cutoff, so it is a D-
• Points missed: 50 − 30 = 20

Drop just one more point to 29 out of 50 (58%) and the grade falls under 60%, becoming an F.

Common uses

• Checking a returned test — confirm the percentage and letter your teacher assigned, or spot a grading error.
• Non-standard point totals — grade a quiz out of 25, a worksheet out of 15, or a final out of 200 without converting to 100 first.
• Self-grading practice tests — score a practice exam and see exactly how many points you missed.
• Teachers and tutors — quickly assign letter grades to a stack of papers scored on raw points.
• Goal setting — see how many more points you would need to move up a letter grade.

Tips and common mistakes

• Earned goes on top, total on the bottom. Swapping the two inverts the percentage; 42 out of 50 is 84%, not the other way around.
• Use raw points, not pre-figured percentages. Enter 42 and 50, not 84, so the tool can also report points missed.
• Watch the cutoffs. This scale rounds nothing in your favor at the boundary; 89.99% is still a B+, and you need a full 90% for the A-.
• Total points must be more than zero. Dividing by a zero total is undefined, so enter the real maximum score.
• Extra credit can exceed 100%. If earned points are above the total, the percentage will read over 100%, which the scale still treats as an A+.

Limitations and notes

This calculator uses one common US plus/minus letter scale, but grading cutoffs are not universal. Some schools omit minus grades, set the failing line at 65% instead of 60%, or use letter ranges that differ by a point or two. It does not apply curves, weighting, or rounding policies your instructor may use, and it grades a single test in isolation rather than averaging a whole course. The letter grade it returns is an estimate for personal planning and may not match an official report card that uses a different policy.

Always confirm your school’s exact percentage-to-letter cutoffs before treating a result as final, and check whether extra credit, dropped questions, or curves change your raw score.

To weight several tests into a course grade or term average, try the GPA calculator for a 4.0 grade point average or the CGPA calculator for a 10-point cumulative average, and browse more study tools in the education category.