Weighted Average Calculator
Combine scores with different weights and see what you need to hit your target average.
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| Weighted average | 7.9 |
| Simple average | 7.75 |
Math: (7×2 + 8.5×3) ÷ 5
On your next assessment (using the weight of the last empty row), you need 6.1.
Quick answer: To calculate a weighted average, enter each score and its weight: the result is the sum of score × weight divided by the sum of the weights. Leave the last row with a weight but no score and enter your target: the calculator tells you the score you need.
How to do it in 3 steps
- 1Enter scores and weights.
- 2See the weighted and simple averages.
- 3Find the score you need.
Why use Pronto Arquivo
Score you need
Works out the score required on your next test to reach your target.
Any weights
Whole numbers, decimals or percentages, like 0.4 and 0.6 or 40 and 60.
Math shown
Displays the formula with your numbers.
Simple average too
For comparison.
Guides
Example
Homework 85% (weight 20), midterm 78% (weight 30) and final 90% (weight 50): (85×20 + 78×30 + 90×50) ÷ 100 = 85.4%.
Frequently asked questions
How do I calculate a weighted average?
Multiply each score by its weight, add them up and divide by the sum of the weights.
How is it different from a simple average?
In a simple average every score counts the same; in a weighted average each counts according to its weight.
How do I find what I need on the final?
Leave the last row without a score, enter its weight and type your target average.
Can I use percentage weights?
Yes, like 30 and 70 or 0.3 and 0.7.
