Weighted Average Calculator
Averages where some values count more than others.
Enter your values
Enter the values (comma separated) you are working with.
Enter the weights (comma separated) you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Weighted average
- 89.5
- Simple average
- 88.5
- Total weight
- 100
- Difference from simple average
- 1
| Value | Weight | Weight % | Contribution |
|---|---|---|---|
| 88 | 20 | 20% | 17.6 |
| 92 | 30 | 30% | 27.6 |
| 79 | 20 | 20% | 15.8 |
| 95 | 30 | 30% | 28.5 |
Quick answer
A weighted average multiplies each value by its weight, sums the results and divides by the total weight.
x̄w = Σ(wᵢxᵢ) ÷ Σwᵢ
At a glance
| What it does | Averages where some values count more than others. |
|---|---|
| Category | Statistics |
| Inputs needed | Values (comma separated), Weights (comma separated) |
| Main output | Weighted average |
| Formula | x̄w = Σ(wᵢxᵢ) ÷ Σwᵢ |
| Cost | Free — no sign-up, no download |
How to use the Weighted Average Calculator
- 1Enter your values in order.
- 2Enter matching weights in the same order.
- 3Read the weighted average and each contribution.
Inputs explained
- Values (comma separated)
- Enter the values (comma separated) you are working with.
- Weights (comma separated)
- Enter the weights (comma separated) you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Values (comma separated)88, 92, 79, 95
- Weights (comma separated)20, 30, 20, 30
Results
- Weighted average89.5
- Simple average88.5
- Total weight100
- Difference from simple average1
Frequently asked questions
Do weights need to sum to 100?
No. Any consistent scale works because the calculation divides by the total weight.
Where is this used?
Course grades, portfolio returns, survey results and any scoring system where components have different importance.
What do I need to enter into the Weighted Average Calculator?
Just 2 values: values (comma separated), weights (comma separated). Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Weighted Average Calculator work out the answer?
A weighted average multiplies each value by its weight, sums the results and divides by the total weight. It applies the formula x̄w = Σ(wᵢxᵢ) ÷ Σwᵢ and shows the working so you can check each step by hand.
Is the Weighted Average Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.