Grade Calculator

What This Grade Calculator Does

A score on its own - “17 out of 20” - is hard to compare, so we turn it into a percentage, the score out of 100. Divide the points you earned by the total possible and multiply by 100: 17 out of 20 is 85%. A grading scale then turns that percent into a letter grade.

Switch modes to work backward and find how many marks you still need to reach a target percentage.

How It Works

$$\begin{aligned} \text{score} &= \frac{\text{points earned}}{\text{total points}} \times 100 \\ \text{marks needed} &= \text{total points} \times \frac{\text{target}}{100} \end{aligned}$$

The letter grade uses the common scale below.

Letter Grade Scale

Percentage	Grade
90% and up	A
80–89%	B
70–79%	C
60–69%	D
below 60%	F

How to Use It

1. Choose test score to grade or marks needed for a target.
2. Enter the points (and the target percentage in the second mode).
3. Read the percentage and grade, or the marks needed.

Worked Examples

Points earned	Total points	Score	Grade
85	100	85%	B
45	50	90%	A
27	40	67.5%	D
18	20	90%	A

Marks needed: for a 90% target out of 200 points, you need $200 \times (90 \div 100) = 180$ points.

FAQ

How do you calculate a grade percentage?

Divide the points earned by the total points and multiply by 100. For 85 out of 100: $(85 \div 100) \times 100 = 85\%$.

What letter grade is my score?

This tool uses the common scale: 90%+ is an A, 80–89% a B, 70–79% a C, 60–69% a D, and below 60% an F. Your school’s scale may differ.

How many marks do I need for a target grade?

Switch to “marks needed for a target”, enter the total points and the target percentage, and the tool shows the marks required.

Is this the same as a percentage calculator?

The score math is the same as “A is what percent of B”. This page adds the letter grade and the marks-needed mode. For other percentage questions, use the percentage calculator.