Weighted or not · Needed-on-final
Test Average Calculator
Letter grade bands
US scale| A+ | 97 and up |
| A | 93 – 96.9 |
| A− | 90 – 92.9 |
| B+ | 87 – 89.9 |
| B | 83 – 86.9 |
| B− | 80 – 82.9 |
| C+ | 77 – 79.9 |
| C | 73 – 76.9 |
| C− | 70 – 72.9 |
| D+ | 67 – 69.9 |
| D | 60 – 66.9 |
| F | below 60 |
The letter beside your average uses these common US bands — your school's cutoffs may differ. Averages round half up to two decimals, the way most gradebooks do.
Add your scores, weight them if your class does, and see your average update as you type. Flip to the final-grade mode to find out what you need on the last test.
The maths
How the average is calculated
Unweighted — every test counts the same:
average = (score₁ + score₂ + … + scoreₙ) ÷ nWeighted — each score is scaled by its weight first:
average = (score₁×w₁ + score₂×w₂ + …) ÷ (w₁ + w₂ + …)Weights are relative, so they never have to add up to 100. Three quizzes at weight 1 and a final at weight 2 behaves exactly like 20/20/20/40.
Unweighted: 78, 85 and 92 → (78 + 85 + 92) ÷ 3 = 85.
Weighted: homework 90 at 30% and exams 80 at 70% → (90×30 + 80×70) ÷ 100 = 83.
Needed on the final: on 85, final worth 20%, aiming for 87 → (87 − 85×0.8) ÷ 0.2 = 95.
Answers
Frequently asked questions
What's the difference between a weighted and unweighted test average?
An unweighted average adds your scores and divides by how many there are — every test counts the same. A weighted average multiplies each score by its weight first, so a final worth 40% moves the result far more than a quiz worth 5%. Use whichever matches how your teacher grades.
Do the weights have to add up to 100?
No. Weights are relative. Three quizzes at weight 1 and a final at weight 2 works exactly like percentages of 20/20/20/40 — the calculator normalizes by the total weight, so any consistent scheme gives the right answer.
How is “what do I need on the final” calculated?
The formula is: needed = (target − current × (1 − w)) ÷ w, where w is the final's weight as a decimal. With an 85 average, a final worth 20%, and an 87 target: (87 − 85 × 0.8) ÷ 0.2 = 95. That's the score that lands you exactly on target.
What if the score I need is over 100?
Then the target isn't reachable on the final alone. The calculator says so rather than pretending — from there your options are extra credit, regrade requests on earlier tests, or aiming at the next grade boundary down.
Can I enter scores above 100?
Yes — extra credit happens. Scores up to 1000 are accepted so bonus points and out-of-more-than-100 point scales converted to percentages both work.
Are my grades stored anywhere?
No. Everything is computed in your browser as you type. Nothing you enter is sent to a server, stored, or shared — close the tab and it's gone.