Quick guide
How to use this calculator
- Enter values in the first list and their matching weights in the second.
- Keep the same number of non-empty rows in both lists.
- Read the exact weighted sum, total weight, and average.
Calculation method
Divide the weighted sum by total weight
Each value is multiplied by its matching weight. Those products are added exactly, then divided by the exact sum of the weights.
Worked example
Two differently weighted scores
A score of 80 with weight 1 and 90 with weight 3 has weighted sum 350 and total weight 4.
(80×1 + 90×3) / (1+3) = 87.5
Supported inputs
Precision and limits
List size
Enter 1–100 values, one per line.
Decimal size
Each value may contain up to 200 digits and 100 decimal places.
Exactness
Exact rational results are never replaced by a rounded decimal; approximations are labelled.
Weights
Weights may be zero but not negative, and their total must be greater than zero.