Everyday Calculators
Percentage Calculator — Percent Of, Percent Change & More
Three percentage jobs in one tool: work out a percent of a number, find what percent one number is of another, and calculate percentage increase or decrease.
Open toolGrade Calculator
What is your grade in the class right now — and what do you need on the final to keep it, or to reach the grade you want? This free grade calculator handles weighted grading the way most courses actually work: add each assignment, quiz, midterm or project with the score you earned and the weight it carries in the course, and it calculates your weighted grade percentage and letter grade. Then set a target grade and the weight of your final exam, and it tells you the exact score you need on that final. Teachers can use it the other way round, to sanity-check a grading scheme before publishing it. Everything runs in your browser — no grades are uploaded or saved.
Your graded work
What do I need on the final?
How to use this tool
- Add a row per assignment or exam with its score and weight.
- Read the weighted grade and letter grade as you type.
- Enter your current grade, target grade and the final's weight.
- See the exact final-exam score required to hit the target.
Worked example
An 85 weighted at 40% plus a 92 weighted at 60% gives 89.2% — a B. Sitting at 78% and targeting 85% with a 40% final? You need 95.5% on it.
Frequently asked questions
How is a weighted grade calculated?
Each piece of work contributes its score multiplied by its weight. Add those contributions together and divide by the total weight: (90 × 20 + 80 × 30 + 85 × 50) ÷ 100 = 85.5% for work weighted 20/30/50. A heavily weighted final therefore moves your grade far more than a small quiz — which is exactly why weighted calculators exist instead of simple averages.
What letter grade scale does this calculator use?
The common US ten-point scale: A = 90–100, B = 80–89, C = 70–79, D = 60–69, F = below 60. Many schools use variations — some set A at 93, add plus/minus bands, or use a 4.0 GPA scale — so treat the letter as a guide and check your syllabus for the scale your course actually uses. The weighted percentage itself does not change between scales.
What if the score I need on the final is over 100%?
Then the target is mathematically out of reach with the weights entered — even a perfect final cannot pull the average high enough. The useful responses are to aim for the next grade band down, or to check whether remaining regular assignments (not just the final) still carry weight you can earn. If the calculator says you need a negative score, your target is already secured even with a zero on the final.
My course uses points, not weights. Can I still use this?
Yes. If a course is points-based (for example 1,000 points total), enter each item's weight as its share of total points: an assignment worth 100 of 1,000 points has a weight of 10. Enter your score on it as a percentage (points earned ÷ points possible × 100). The weighted result is identical to summing the points directly.
Related tools: work out any percentage with the percentage calculator, or convert a salary while job-hunting after graduation with the salary to hourly calculator.