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Calculating Grades by Weight Calculator

Calculate weighted grade averages from assignment categories, scores, and category weights.

Use unweighted for equal items, or weighted when each item/category has a weight.

Enter the score as a percentage from 0 to 100.

Optional weight or category value. Use weighted mode to apply weights.

Enter the score as a percentage from 0 to 100.

Optional weight or category value. Use weighted mode to apply weights.

Enter the score as a percentage from 0 to 100.

Optional weight or category value. Use weighted mode to apply weights.

Enter the score as a percentage from 0 to 100.

Optional weight or category value. Use weighted mode to apply weights.

Enter the score as a percentage from 0 to 100.

Optional weight or category value. Use weighted mode to apply weights.

Enter the score as a percentage from 0 to 100.

Optional weight or category value. Use weighted mode to apply weights.

Status: initial

Results

Awaiting calculation

Calculator guide

Introduction

The Calculating Grades by Weight Calculator helps turn weighted assignment categories into an overall class grade estimate.

Purpose

Use this calculator when homework, quizzes, tests, projects, and exams each count for different percentages of the final grade.

Grade average method

For an unweighted average, add the scores and divide by the number of scores. For a weighted average, multiply each score by its weight, add the weighted points, and divide by the total weight.

Variable explanations

Score

A grade entered as a percentage from 0 to 100.

Weight

The relative importance of a score or category.

Total weight

The sum of all weights included in the calculation.

Weighted points

A score multiplied by its weight.

Average type

Controls whether weights are used or every score counts equally.

Formula guide

Unweighted average

Average = sum(scores) / number of scores

  • Scores are percentage grades.
  • Each score counts equally.

Use this when every assignment or exam should count the same.

Weighted average

Average = sum(score x weight) / sum(weights)

  • Weight is the importance of a score or category.
  • Weights can total 100 or any consistent scale.

Use this when exams, homework, quizzes, or projects count differently.

Letter estimate

A >= 90, B >= 80, C >= 70, D >= 60

  • The estimate uses a common grading scale.
  • Your school may use a different scale.

Use this only as a quick interpretation, not as an official grade.

Worked examples

Weighted course categories

  1. Homework 92 at weight 30, quizzes 85 at weight 20, exams 88 at weight 50 gives 88.6%.

Unweighted scores

  1. Scores 80, 90, and 100 give (80 + 90 + 100) / 3 = 90%.

Weights that do not total 100

  1. Scores 95 at weight 2 and 80 at weight 1 give (95 x 2 + 80 x 1) / 3 = 90%.

Common mistakes

Mixing weighted and unweighted grading

Use weighted mode only when the gradebook or syllabus gives weights.

Assuming weights must total 100

Weights can total 100, 1, or another consistent scale because the formula divides by total weight.

Using points earned as a percentage without converting

Convert points earned out of points possible into a percentage before entering the score.

Treating the letter estimate as official

Letter cutoffs vary, and some classes use plus/minus scales or custom rounding.

FAQs

What does this Grade Average Calculator do?
It calculates an overall grade percentage from several scores using weighted or unweighted averaging.
What is a weighted grade average?
A weighted grade average gives some scores or categories more influence than others.
What is an unweighted grade average?
An unweighted average treats every score as equally important.
Do my weights need to add up to 100?
No. The calculator divides by the total weight, so any consistent weight scale works.
Can I enter category grades?
Yes. You can enter category percentages such as homework, quizzes, projects, and exams.
Can I enter assignment grades?
Yes. Use unweighted mode if every assignment should count equally, or weighted mode if each assignment has a point or weight value.
How do I calculate a weighted grade?
Multiply each score by its weight, add those products, and divide by the total weight.
How do I calculate an unweighted grade?
Add all scores and divide by the number of scores.
Can this calculate my final exam target?
No. This page focuses on current average. A final grade target calculator is a separate workflow.
Does the letter grade estimate match every school?
No. It uses a common 90/80/70/60 scale, but official cutoffs vary.
Can I use decimal scores?
Yes. Scores such as 87.5 or 92.25 are supported.
What if an assignment is missing?
Leave unused rows blank unless your gradebook counts the missing assignment as zero.
Should I use points or percentages?
Use percentages in the score fields. If you have points, convert earned points divided by possible points into a percentage.
Can a weight be zero?
No. If an item should not count, leave that row blank.
Why does my school gradebook differ?
Gradebooks may use custom category rules, drops, extra credit, rounding, or plus/minus letter scales.

References

Related calculators

Last updated and version history

Last updated: 2026-07-09

  • 1.0.0 (2026-07-09): Initial weighted-grade intent page using the verified grade average engine.