Grade Percentage Calculator

About this Grade Percentage Calculator

Grades can get noisy fast: simple points in one class, weighted categories in another, extra credit sprinkled everywhere, and at least two different letter scales. This page puts all of that in one place. You can enter assignments as earned/possible points, drop the lowest scores, and layer in extra credit. Or switch to weighted categories, set weights that add to 100%, drop the weakest items inside each category, and include extra credit in a category you choose. The calculator then shows your overall percentage and the letter grade based on a plus/minus or straight 10-point scale. Everything happens locally in your browser and you can export a CSV for your records.

How to use

1. Pick a mode. Simple points treats the class as one bucket. Weighted categories lets you define Homework, Quizzes, Projects, etc., with weights that sum to 100%.
2. Add items. In Simple mode, add assignments with earned and possible points. In Weighted mode, create categories first, then add assignments and attach each to a category.
3. Drop lows and add extra credit. In Simple mode, set “Drop lowest N” to ignore that many weakest percentages. In Weighted mode, each category has its own drop count. Extra credit can be added as a raw point bump either globally (Simple) or inside a selected category (Weighted).
4. Choose a letter scale. Use the plus/minus default (A starts at 93 by default) or a straight 10-point scale. If your instructor shifts the A cutoff, enter a custom value.
5. Calculate and review. Click Calculate. You’ll see a summary with the overall percentage and letter grade. In Weighted mode you also get a full category breakdown.
6. Export CSV. Save a copy for planning or for a meeting with your instructor or counselor.

Result interpretation

The overall percentage is the headline number. In Simple mode it’s total earned divided by total possible after dropping N lowest percentages. In Weighted mode, each category’s percentage is computed after dropping its lowest items; then we multiply by the category’s weight and add them up. The letter grade is mapped from the overall percentage using your chosen scale. If you set a custom A cutoff, everything above that point reads as an A, with the rest of the plus/minus ladder following the common U.S. pattern.

Extra credit works as real points: if you add 3 extra points to a category with 50 earned out of 60 possible, it becomes 53/60 before the weight is applied. This keeps your math transparent and easy to explain. If you need a pure percentage bump instead, enter the equivalent extra points manually (for example, 2% of 60 points is 1.2 points).

FAQ

Do weights have to equal 100%? Yes. The calculator requires the total to be 100% so your results add up cleanly.

How are “lowest N” drops chosen? We sort by percent within the relevant scope and drop from the bottom up. In Simple mode, it’s across the whole class. In Weighted mode, drops happen inside each category.

My instructor rounds differently. What should I do? Use the CSV to show your raw math, then apply your instructor’s rounding rule by hand if they use a special policy.

Can I track GPA from here? This page focuses on class percentage. For term or cumulative GPA, use the GPA Calculator. If you want to see the grade needed on a final, try the Final Grade Calculator. For quick percent/ratio work, the general Percentage Calculator is handy.

Reminder: schools vary on cutoffs and rounding. Treat this as planning help, not an official record.