Weighted Grade Calculator
Calculate your true weighted grade by adding each assignment, quiz, midterm and final with its own weight. Fully usable on mobile. Pro Mode adds drop lowest, grade curve, extra credit, category grouping, what-if analysis and PDF report.
Drag sliders to see how changing each score affects your weighted average.
How much each assignment contributes to your final grade.
How to Use the Weighted Grade Calculator
From assignments and weights to a live weighted average. Fully usable on mobile.
Every calculation runs inside your own browser. No account, no tracking, nothing ever uploaded.
Weighted Grade Calculator, Free and Online
A weighted grade calculator turns your assignments, quizzes, midterms and finals, each with their own percentage weight, into one true overall grade instantly. This one supports drop lowest, grade curves, extra credit, category grouping, and six national grading systems, updating live as you add or edit assignments, entirely inside your browser.
Most syllabi do not treat every piece of work the same. A final exam might be worth 40 percent of your grade while a single homework set is worth 2 percent, and averaging those two scores together as if they mattered equally would give you a badly wrong picture of where you actually stand. This free weighted grade calculator tool handles the real math. Add each assignment with its score and its weight, and your weighted average, letter grade and GPA recalculate the moment anything changes. Switch between US, UK, Indian, Pakistani, Bangladeshi or Australian grading systems, or use plain percentage mode. Pro Mode adds drop lowest, so your single worst score can be excluded, a grade curve that lifts every assignment by the same number of points, extra credit with a genuine cap you control, category grouping to see how homework versus exams are each performing, a target score calculator, a what-if simulator, and an assignment impact breakdown showing exactly which item is moving your grade the most.
Every score is multiplied by its own weight before being added to the running total, then that total is divided by the sum of all the weights. This is exactly the calculation your instructor's own gradebook is running behind the scenes.
1Simple vs Pro, What Each Mode Includes
| Feature | Simple Mode | Pro Mode (Free) |
|---|---|---|
| Weighted average, letter grade and GPA across 6 grading systems | Included | Included |
| Unlimited assignments with live weight tracking | Included | Included |
| Copy results and grading scale reference | Included | Included |
| Drop lowest, grade curve, capped extra credit | Not included | Included |
| Category grouping with per category summary | Not included | Included |
| Target score calculator, what do I need on remaining work | Not included | Included |
| What-if slider simulator and grade distribution view | Not included | Included |
| Assignment impact analysis and downloadable PDF report | Not included | Included |
2Weighted Grades, Quick Examples
The mistake that trips up the most students is confusing a curve with extra credit, or assuming weights that do not add to 100 will simply average out correctly. They will not. If your syllabus lists categories that total 100 percent but you only enter 90 percent worth of weighted items into the calculator, either because you forgot a category or mistyped a number, the weighted average formula divides by whatever weight total you actually entered, silently producing a grade that does not match reality. Always check the weight bar under the assignment table before trusting the result.
3Where the Weighted Average Formula Actually Came From
The specific mathematical idea this calculator runs on, giving different observations different weights before averaging them, has a documented inventor and a genuinely sad backstory. According to the MacTutor History of Mathematics archive at the University of St Andrews, the English mathematician Roger Cotes worked out the weighted arithmetic mean around 1712, in a short tract on estimating errors in astronomical observations. Cotes never got to publish it himself. He died of a violent fever in 1716 at only 33 years old, and his cousin Robert Smith spent years sorting through Cotes's disordered papers before finally publishing the work in 1722, six years after Cotes's death, as part of a collection called Harmonia Mensurarum. Isaac Newton, who had worked closely with Cotes on the second edition of the Principia, is said to have remarked afterward that had Cotes lived, mathematics might have gone even further. The habit of assigning different importance to different pieces of data, the exact principle behind every weighted grade calculation, traces back to that one short, posthumously published tract.
| Question | Quick Answer |
|---|---|
| Who first worked out the weighted mean? | Roger Cotes, around 1712 |
| When was his work actually published? | 1722, six years after his death |
| Who published it on his behalf? | His cousin, Robert Smith |
| How old was Cotes when he died? | 33 |
Every calculation runs inside your own browser using JavaScript, nothing is uploaded or sent to a server, and no account or signup is required.
4Frequently Asked Questions
Grounded in the University of St Andrews MacTutor History of Mathematics archive's documented account of Roger Cotes's 1712 work and its 1722 posthumous publication, not the assumption that weighted averaging was a modern statistical invention. The full biography is available on MacTutor's Roger Cotes page. For related tools on this site, see the Grade Calculator and the full SmallStudyTools.com tool library.
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