Enter each value with its weight to get the weighted average instantly. Below, you'll also find the formula explained, related calculators, and answers to common questions.
Please enter at least one value with a weight greater than 0.
Add a row for every item. The weight can be a credit, quantity, hour count, or percentage — anything that reflects how much that value should count.
Say a student scores 70, 85, and 90 on three tests, weighted 1, 2, and 3 because later tests count more.
| Value | Weight | Value × Weight |
|---|---|---|
| 70 | 1 | 70 × 1 = 70 |
| 85 | 2 | 85 × 2 = 170 |
| 90 | 3 | 90 × 3 = 270 |
Step 1 — Sum the value×weight column: 70 + 170 + 270 = 510
Step 2 — Sum the weights: 1 + 2 + 3 = 6
Step 3 — Divide: 510 ÷ 6 = 85
Notice the result (85) sits closer to the higher-weighted scores of 85 and 90 than a simple average would — a plain average of 70, 85, and 90 is 81.67, pulled down by the low-weighted first test.
Multiply each value by its own weight, add up all of those products, then divide that total by the sum of the weights. For example, with values 80 and 90 weighted 2 and 3: (80×2 + 90×3) ÷ (2+3) = 430 ÷ 5 = 86. The result always sits closer to whichever value carries the larger weight.
For marks, the "weight" is usually the credit hours, subject importance, or exam proportion (like a final worth 60% and coursework worth 40%). Multiply each mark by its credit or percentage weight, sum those results, then divide by the total credits or total weight percentage (which should add up to the whole course load, or 100 for a percentage split). This is exactly how most universities compute a semester GPA or overall percentage from individual subject scores.
It's a way of averaging numbers that don't all deserve equal say — instead of treating every value the same as a simple average would, it scales each one by its relative importance before combining them. This method shows up in accounting (weighted average cost of inventory), finance (a portfolio's weighted average return based on how much is invested in each asset), statistics, and education, anywhere some inputs should influence the result more than others.
Divide one item's weight by the total of all weights, then multiply by 100. For instance, if a project has weights of 3, 5, and 2 (totaling 10), the item with weight 5 carries a weightage of (5÷10)×100 = 50%. This turns raw weights into percentages that show exactly how much each item contributes to the final weighted average.