Helpful Toolbox

Semester Grade Calculator

Enter your quarter, midterm, and final exam grades with their weights (like Q1 40%, Q2 40%, final 20%) and see your semester percentage and letter grade instantly. All weights and letter cutoffs are editable, and everything runs privately in your browser.

📖 How it works & FAQ

How semester grades are calculated

Most schools compute a semester grade as a weighted average: each grading period counts for a set share of the final mark. A common setup is Quarter 1 at 40%, Quarter 2 at 40%, and the final exam at 20%, but plenty of schools use 45/45/10, add a midterm, or weight three quarters with an exam. The math is always the same: multiply each grade by its weight, add those products together, and divide by the total weight. This calculator does exactly that, live, as you type.

Editable weights and letter cutoffs

Every number here is editable. Change any component weight to match your school's policy, add rows for midterms, projects, or extra quarters, and remove the ones you don't need. The letter-grade cutoffs (A at 90, B at 80, C at 70, D at 60 by default) are also editable, so if your school draws the A line at 93 or the D line at 65, just type it in. If your weights don't add up to 100%, the tool normalizes them automatically and tells you so in the results row. Everything runs in your browser & no grades are uploaded anywhere.

How to use it

  1. Type each component's name, the grade you earned (as a percent), and its weight. The defaults show a classic Q1/Q2/final split.
  2. Click "Add component" for a midterm, third quarter, or project grade, and remove any rows you don't need.
  3. Adjust the letter cutoffs if your school's grading scale differs from the 90/80/70/60 default.
  4. Read your semester percentage, letter grade, and total weight in the results — they update instantly as you type.

FAQ

What if my weights don't total 100%?
The calculator divides by the actual total, so the result is still a correct weighted average. It flags the mismatch so you can double-check your school's policy.
Can I use letter grades instead of percentages?
Enter the percentage equivalent your school uses — for example, if a B+ is recorded as 88, type 88. Point-based classes work too: convert each score to a percent first.
What grade do I need on the final?
Leave your quarter grades in place, then try different final-exam values until the semester grade crosses the line you want. Because results update live, a few guesses gets you there fast.
Does this match my school's official grade?
It will if the weights and cutoffs match your syllabus. Schools sometimes round differently or add participation adjustments, so treat the official transcript as final.