CalcRipple

Weighted Grade Calculator

Use this weighted grade calculator to combine assessment percentages with their weights. Multiply each grade by its weight, add the products, then divide by the included weight. Blank grades are excluded; zero grades count. A partial-course average is not your final course grade.

Created by Dennis Norton · Updated November 1, 2026

How to use the weighted grade calculator

  1. Choose course percentage weights or relative weights.
  2. Enter each assessment grade as a percentage, then its weight. Use Add assessment for more rows.
  3. Leave an ungraded assessment blank. Type 0 only if the score really is zero.
  4. Read the completed-work average. In percentage mode, also check the course points earned and remaining weight.

For a points-based test, convert points earned to a percentage first. Do not mix raw points with percentage grades. Relative weights represent importance, not course coverage.

Weighted grade formula

Weighted average = sum of (grade × weight) ÷ sum of included weights.

Each grade is a percentage. The weight represents its relative importance. The formula follows the weighted mean described by Wolfram MathWorld, with grade-specific examples corroborated by RapidTables.

If weights are course percentages, course points earned = sum of (grade × weight) ÷ 100. The average divides by the weight already included instead. Those quantities coincide only when the included course weights total 100%.

Calculations retain decimal precision until display. Results are rounded half up to two decimal places. Separately rounded rows may not add to the rounded total.

Worked examples

A complete course

Grades of 80%, 90% and 72%, weighted 30%, 50% and 20%, give (80 × 30 + 90 × 50 + 72 × 20) ÷ 100 = 83.40%. The included weight is 100%, so the course contribution is also 83.40 percentage points.

An unfinished course

Grades of 80% at 30% weight and 90% at 20% weight give a completed-work average of 84.00%. They have earned 42.00 course percentage points, with 50% of the course weight remaining. The calculator does not predict the missing grades.

A zero is not missing work

A zero grade at 50% weight and a 100% grade at 50% weight average to 50.00%. If the first grade is blank instead, the completed-work average is 100.00%, based only on the graded half of the course.

What the result does not include

This tool accepts percentage scores, including extra credit up to the stated input limit. It does not convert letter grades into GPA, apply a grade curve, drop the lowest assessment, or reproduce a school-specific gradebook rule. Treat each row as a category average when your syllabus weights categories rather than individual assignments.

The input limit of 20 assessments is a product limit. Your syllabus and instructor determine the actual grading policy.

Questions and answers

Do my weights have to add up to 100%?

Course percentage weights must total no more than 100% among the graded rows. If they total less, the calculator reports an average for completed work and a separate course contribution. Choose relative weights when your numbers express importance rather than percentages of the whole course.

Should I enter a missing assignment as zero?

Enter zero only when the assignment has actually received a zero score under your course rules. Leave the grade blank if it has not been graded. Blank rows are excluded from the average, while an explicit zero lowers it according to the weight you enter.

Can I use points instead of percentage grades?

Convert each assessment score to a percentage before entering it in the grade column. Raw point totals are not comparable percentage grades. If your course uses total points without category weights, calculate total earned points divided by total possible points instead of assigning arbitrary assessment weights.

Why is my current average different from my course contribution?

Your current average describes only the graded work you entered. Course contribution describes how many percentage points that work has earned toward the whole course. When some course weight remains ungraded, the average can look high even though a substantial part of the final result is still undecided.

Sources and maintenance

Maintained by Dennis Norton. Sources checked November 1, 2026. Course rules take precedence over these illustrative calculations.

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