Boneyard Tools

Letter Grade Calculator

Type a percentage score and instantly see the letter grade it earns and the matching points on the 4.0 GPA scale. The calculator uses the common US thirteen-band scale, from A plus at 97 percent down to F below 60. A grade table sits beneath the result and highlights the band your score lands in.

How to convert a percentage to a letter grade

  1. Type your score into the 'Percentage score' field, using decimals if you need them.
  2. Read the Letter grade tile and the GPA points tile that appear beside it.
  3. Scan the Grade scale table below, where your current band is highlighted.
  4. Click Copy to grab a one-line summary such as '93% = A (4.0 GPA)'.

Examples

A solid A

93
93% = A (4.0 GPA)

Right on the A-minus boundary

90
90% = A- (3.7 GPA)

A passing D grade

63
63% = D (1.0 GPA)

Frequently asked questions

What percentage is an A?

On this scale a plain A runs from 93 through 96 percent, an A plus is 97 and above, and an A minus covers 90 to 92. All three carry 4.0 GPA points except the A minus, which is 3.7. Enter any score in that range to see which band it hits.

What letter grade is failing?

Anything below 60 percent is an F worth 0.0 GPA points. The lowest passing grade is a D minus, which starts at exactly 60 percent and carries 0.7 points. There is no E on this scale.

How are GPA points assigned?

Each letter maps to a fixed value on the 4.0 scale: A and A plus are 4.0, A minus is 3.7, then each step down drops by roughly 0.3 or 0.4 points through B, C and D, ending at 0.0 for an F. The GPA points tile shows the value beside the letter.

Do all schools use this exact scale?

No. This is the common US letter scale, but cutoffs vary between institutions. Some treat any score of 90 and above as a flat A, others drop plus and minus grades entirely, and a few weight honours or AP classes higher. Always confirm against your own school's grading policy.

How are the boundaries handled?

Each band is inclusive at its lower edge, and the calculator does no rounding. A score of exactly 90 is an A minus because it meets the 90 threshold, while 89.9 stays 89.9 and falls into the B plus band since it is below 90.

Can I enter decimals or scores above 100?

Yes. Decimals like 84.5 work fine and land in the correct band. Scores above 100, such as a 103 from extra credit, are accepted and simply return the top A plus grade, since any value at or above 97 qualifies.

What happens with a zero or a negative number?

A score of 0 is a valid F worth 0.0 points. Negative numbers are rejected and the result area asks for a score of 0 or more, because a percentage below zero has no meaning here.

Does this calculate a full GPA across courses?

No. This converts a single percentage into one letter and its grade points. To average several courses into a term or cumulative GPA, use a dedicated GPA calculator that weights each grade by credit hours.

Is my score sent anywhere?

No. The conversion runs entirely in your browser, so whatever you type stays on your device and nothing is uploaded or saved.

Learn more

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