Weighted Average Calculator

Calculate weighted averages with custom weights for grades, scores, portfolios, and more. Enter your values and their corresponding weights to get an accurate weighted average.

Values (one per line or comma-separated)

Weights (one per line or comma-separated)

How to Use the Weighted Average Calculator

Enter your values in the first field (one per line or separated by commas)
Enter the corresponding weights in the second field (must match the number of values)
Click "Calculate Weighted Average" to get your result
The calculator displays both the weighted average and total weight

💡 Tip: The number of values must match the number of weights. You can enter them on separate lines or separated by commas, spaces, or any combination.

What is a Weighted Average?

A weighted average is a mean calculated that takes into account the relative importance (weight) of each value. Unlike a simple average where all values are treated equally, a weighted average multiplies each value by its weight before summing and dividing by the total weight.

Formula

The weighted average is calculated using the formula:

Weighted Average = (v₁ × w₁ + v₂ × w₂ + ... + vₙ × wₙ) / (w₁ + w₂ + ... + wₙ)

Where v represents values and w represents weights.

Common Use Cases

Grade Calculation: Calculate final course grades where different assignments have different weights
Investment Portfolio: Determine portfolio returns based on investment amounts
Survey Analysis: Weight survey responses based on representation
Quality Control: Calculate average quality scores with importance factors
Performance Metrics: Evaluate KPIs with different levels of importance

Example

If you have test scores of 85, 90, and 78 with weights of 30%, 40%, and 30% respectively:

Values: 85, 90, 78
Weights: 30, 40, 30
Calculation: (85 × 30 + 90 × 40 + 78 × 30) / (30 + 40 + 30)
Weighted Average: (2550 + 3600 + 2340) / 100 = 84.9