weighted mean formula
How to Calculate Weighted Mean in Excel and Manually
This article explains weighted mean both conceptually and computationally for students and analysts.
How to calculate using Weighted Average Calculator
- Enter values list and corresponding weights list in the same order.
- Multiply each value by its weight and sum all products.
- Divide weighted sum by total weight.
Weighted Average Calculator formula
- Weighted mean = sum(value x weight) / sum(weight).
- If weights are percentages, convert correctly when needed.
- Equal weights reduce to simple arithmetic mean.
Worked example
- Values: 80, 90, 75 and weights: 0.3, 0.4, 0.3.
- Weighted sum = 82.5.
- Total weight = 1.0, so weighted average = 82.5.
Accuracy and interpretation notes
- Values and weights must have identical count.
- Check for accidental weight-entry mismatch before finalizing.
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