Grade Calculator
Work out your average, what you need on the final, or a test score in percent.
Step by step
Your previous calculations
Tap one to open it again. Saved only on this device.
How it works
The method
A weighted grade multiplies each score by its weight, adds the results and divides by the total weight: Σ(score × weight) ÷ Σ weight.
Worked example
Homework 90 (weight 20), test 70 (weight 50), project 80 (weight 30): (1800 + 3500 + 2400) ÷ 100 = 77.
Common mistakes
Put every score on the same scale (for example out of 100) before averaging. A plain average of category averages ignores the weights.
Questions & answers
Why is the answer empty?
Fill in at least one grade (Average) or every box (Final exam, Test score). Leave unused rows empty; they are skipped.
Do the weights have to add up to 100?
No. Any weights work, because the total is divided by the sum of the weights: 3 credits and 4 credits, or 20 %, 30 % and 50 %, give the right weighted average either way.
It says “Give every grade a weight”. What should I do?
Once you type one weight, every grade needs one. Either fill in all the weights, or clear them all to get a simple average where each grade counts once.
How is the score needed on the final worked out?
Now 80 %, final counts 40 %, you want 85 %: your 80 % is worth 80 × 60 ÷ 100 = 48 points; you need 85 − 48 = 37 more; 37 × 100 ÷ 40 = 92.5 % on the final.
It says more than 100 %. What does that mean?
Even full marks on the final would not lift your grade to the target. Lower the target to see what is still possible, or check that the final's weight is right.
Why does the average not show a letter grade (A, B, C)?
Letter grades and pass marks are different in every country and school, so the average is given as an exact percent; compare it with your school's own scale. In the GPA tab you can type letters: they are read on the common 4.0 scale shown under the answer.