Weighted Average Calculator
Local ProcessingCompute the weighted average of values according to assigned weights.
How It Works & Processing Standards
Enter values above to calculate results automatically. Check each input field for guidance and units.
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Averages values that do not count equally. Choose weighted mean or weighted median under "Calculation".
What You Can Do
- Weighted mean
- Σ(value × weight) ÷ Σweight — grades by credit hours, prices by quantity.
- Weighted median
- The value where the cumulative weight passes half. Less affected by extreme values.
How to Use Weighted Average Calculator
- 1Choose a calculationPick weighted mean or weighted median.
- 2Enter values and weightsPut both lists in the same order with the same count.
- 3Read the resultCopy it or keep it with a share link.
Examples
Grade average by credits
Input: Scores 90, 80, 70 / credits 3, 2, 1
Result: 83.3333333333
Weighted median
Input: Values 10, 20, 30, 40 / weights 1, 1, 5, 1
Result: 30
Common Use Cases
- Grade averages that account for credit hours
- Average purchase price across several buys
- Combining evaluation scores with different weights
Frequently Asked Questions (FAQ)
Do the weights need to add up to 1 or 100?
No. The sum of weights is the divisor, so any positive weights such as 3, 2, 1 work. A total weight of 0 cannot be calculated.
What if the lists have different lengths?
Values cannot be paired, so you are asked to make both lists the same length.