How to use the EZ Grader Calculator
- Choose a tab — Average Grade for a running mean, Final Grade for the score needed on your exam, Weighted Grade when syllabus categories carry different percentages, or Easy Grader for quick test scoring from total questions and wrong answers.
- Pick an input type (Average / Weighted tabs) — enter raw percentages, letter grades (A+ through F), or points earned versus points possible.
- Fill your rows — add assignments with optional weights. Use Add Row for more categories. On Easy Grader, use the steppers or keyboard shortcuts Q, W, and R.
- Set a target (optional) — enter a target average and the weight of a remaining assignment to see the additional grade required.
- Calculate — results appear in the right panel with letter equivalents, a grading chart (Easy Grader), and a breakdown table. Save or copy values for your records.
What is an EZ Grader?
An EZ Grader (easy grader) helps teachers and students turn scores into clear percentages without manual arithmetic. Classic paper slide charts mapped one test to a letter; this calculator adds course averages, category weights, final-exam planning, and a dedicated Easy Grader tab for everyday quizzes and tests.
For a deeper walkthrough with worked examples and common pitfalls, read EZ Grader Calculator Guide: Average, Final & Weighted Grades Explained.
Easy Grader — quick test scoring
The Easy Grader tab is built for the moment you finish grading a stack of papers: enter the total number of questions and how many were wrong. The tool shows correct-over-total, the percentage grade, and an optional grading chart listing every wrong-count from 1 through the test length.
Toggle Show Decimals when you need tenths (for example 86.7% instead of 87%). Calculations run in your browser — nothing is uploaded.
Example: 25 questions, 3 wrong → 22/25 = 88%. The chart also shows what 1, 2, or 4 wrong would score for quick reference.
Average vs. weighted vs. final grade
- Average grade
- Adds your scores and divides by how many you entered when weights are blank. If you supply weights, it switches to a weighted mean automatically.
- Weighted grade
- Multiplies each category score by its syllabus weight, sums the products, and divides by the total weight completed so far — the method most college portals use mid-semester.
- Final grade needed
- Solves for the exam score required to reach your target course grade given your current standing and how much the final counts.
Weighted grade formula
When categories carry different weights, multiply each score by its weight and divide by the sum of weights for completed work:
Example: Homework 88% (weight 20), quizzes 74% (15), midterm 68% (30). Weighted sum = 0.20×88 + 0.15×74 + 0.30×68 = 49.1. Completed weight = 65, so current grade = 49.1 ÷ 65 × 100 = 75.5%.
Final exam grade needed
Let C = current course grade (%), D = desired final grade (%), and w = final exam weight as a decimal (30% → 0.30):
Example: Current 84%, desired 90%, final weight 30% → F = (90 − 84×0.70) ÷ 0.30 = 94% needed on the final.
Additional grade needed for a target average
When you know a future assignment weight and your target course average:
Letter grade and points modes
Letter grades convert to a midpoint percentage (for example B+ → 87%) before math runs. Scales vary by institution — confirm cutoffs on your syllabus.
Points mode treats each row as points earned ÷ points possible, then applies the same average or weighted logic. Totals for earned and max points display as you type.
Use cases
- Mid-semester check-in — enter completed categories only; the weighted tab divides by completed weight, not 100%.
- Final exam planning — use the Final Grade tab after your professor posts the exam weight.
- What-if scenarios — model a missing homework as 0% or a projected quiz score before grades post.
- Scholarship thresholds — find the additional grade needed to hold a 3.5 GPA equivalent percentage.
Common mistakes and fixes
- Dividing by 100 mid-semester — if only 65% of category weight is complete, divide by 65, not 100. This tool uses completed weights automatically.
- Simple average on a weighted syllabus — treating a 5% quiz like a 35% final skews results by several points. Use the Weighted tab when weights are listed.
- Mixing points and percentages — convert to one system per row. Points mode handles raw scores; do not also type a percent in the same row.
- Ignoring dropped grades — delete rows you do not need with the remove control, or leave them blank.
Related tools
- Percentage Calculator — percent of a number and percentage change
- EZ Grader Calculator Guide — formulas, examples, and FAQ