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Letter Grade Calculator

Introduction

Convert any percentage into a letter grade in one click. The letter grade calculator supports the three grading scales US schools actually use: plus/minus (most colleges), the 10-point scale (most K–12 schools), and the older 7-point scale still used in a few districts. It also returns the GPA equivalent on the 4.0 scale.

Letter grade

B+

GPA equivalent: 3.3

How it works

A percentage falls into a range of the chosen scale. The calculator reads the percentage, matches it to the range, and prints the letter and GPA value. Because scales differ, the same percentage can yield different letters — 92% is an A− on plus/minus and an A on the 10-point scale.

The formula

Letter = the highest band whose lower bound ≤ Percentage

On the plus/minus scale, an A+ needs ≥ 97, A needs ≥ 93, A− needs ≥ 90, and so on down to F below 60.

Step-by-step instructions

  1. Compute your percentage — use the Easy Grader or divide points earned by points possible × 100.
  2. Choose the scale that matches your school: plus/minus, 10-point, or 7-point.
  3. Enter the percentage. The letter and GPA value appear instantly.
  4. Compare against your syllabus if the letter looks off — some teachers publish custom cutoffs.

Real examples

  • 92% on plus/minus. A− (GPA 3.7). Same 92% on 10-point → A (GPA 4.0). Same 92% on 7-point → A (GPA 4.0).
  • 84% on plus/minus. B (GPA 3.0). On 10-point → B (3.0). On 7-point → B (3.0). No difference in the middle bands.
  • 76% on plus/minus. C (GPA 2.0). On 10-point → C (2.0). On 7-point → C (2.0). But 74% falls to C on plus/minus, C on 10-point, and D on the stricter 7-point scale.

Teacher tips

  • State the scale on day one of class. Half the grade disputes teachers face come from mismatched expectations about the boundaries.
  • Publish rounding rules alongside the scale. "≥89.5 rounds to A−" is a policy; "the computer decides" isn't.
  • When migrating from a 10-point to a plus/minus scale, warn students that a low A on the old scale can become an A− on the new one.

Student tips

  • Know which scale your school uses before comparing letters with friends elsewhere.
  • Small percentage jumps matter near boundaries — moving from 89 to 90 turns a B+ into an A− on plus/minus.
  • When applying to college, understand that admissions offices often recalculate letters on their own scale.

Why schools use different scales

A 10-point scale is easy to remember but compresses information — a 90 and a 99 both look like an A. Plus/minus scales split each letter into three bands, giving students at the top of a range credit for stronger work. The 7-point scale used to be common in North Carolina and a handful of other districts; today it's rare but still valid.

Frequently asked questions

How does the letter grade calculator decide the letter?

It compares your percentage to the boundaries of the scale you picked — plus/minus, 10-point, or 7-point — and returns the highest letter you meet. It also shows the GPA equivalent on the 4.0 scale.

Which scale should I use?

Most US colleges use plus/minus. K–12 schools most often use the 10-point scale. The 7-point scale is now rare but still appears on some older transcripts and in a few districts.

Is 89.5% an A or a B?

Depends on the rounding rule. Many schools round up, so 89.5 becomes 90 (A− on plus/minus, A on the 10-point). Others cut off strictly at 90.0. Check the syllabus.

What's the difference between an A and an A+?

On the plus/minus scale, A+ is 97–100 and A is 93–96, but many US colleges cap grade points at 4.0 for both. On unweighted 10-point scales, A+ isn't distinguished from A.

Does an F have a percentage range?

F covers everything below the D cutoff — usually 60% on 10-point and plus/minus scales, 70% on the older 7-point scale. Some schools award grade points of 0.0 regardless of how far below.

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