Calculate the weighted mean from any list of values and weights
Enter Values & Weights
A new row appears automatically as you type. Leave the last blank row empty.
Results
Breakdown
| # | Value | Weight | Weight % | Contribution | Bar |
|---|---|---|---|---|---|
| 1 | 85 | 3 | 21.43% | 18.21428571 | |
| 2 | 90 | 4 | 28.57% | 25.71428571 | |
| 3 | 78 | 2 | 14.29% | 11.14285714 | |
| 4 | 95 | 5 | 35.71% | 33.92857143 |
Contribution = (value × weight) ÷ total weight. The bar shows each item's share of the total weight.
How It Works
A weighted average calculator lets you find the weighted mean when values don't contribute equally. Whether you're calculating a GPA with different credit hours, a portfolio return with varying positions, or survey scores with different sample sizes, this tool computes the exact weighted average along with a full breakdown of each item's contribution and weight percentage.
A weighted average assigns a numerical weight to each value before averaging. The formula is: sum of (value × weight) divided by the sum of all weights. Unlike a simple average, values with higher weights pull the result more strongly toward themselves.
A regular (arithmetic) average treats every value identically — it divides the total sum by the count of items. A weighted average lets each value have a different level of importance. For example, a course worth 4 credit hours matters more to your GPA than a 1-credit elective.
No. Weights can be any non-negative numbers. Only their relative sizes matter — weights of 1, 2, 3 produce exactly the same result as 10, 20, 30. The calculator shows each weight as a percentage of the total so you can see the breakdown clearly.
Yes. Enter your grade points (or percentage scores) as the values and your course credit hours as the weights. The resulting weighted average is your GPA-style score, giving higher-credit courses proportionally more influence on the final number.