Weighted Average Calculator

What is the Weighted Average Calculator?

Calculate a weighted average from values and their weights. A weighted average gives more importance to some values than others, which is how course grades, portfolio returns and index scores are calculated.

How to use the Weighted Average Calculator

1. Enter your values, your weights.
2. Results update automatically as you type; you can also press Calculate.
3. Read the output: weighted average, simple average.
4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Worked example

With values = 90, 85, 78, weights = 0.3, 0.3, 0.4, the Weighted Average Calculator returns weighted average: 83.7; simple average: 84.3333333333.

Where the Weighted Average Calculator helps in real life

Your course grade is 40% exams, 35% assignments and 25% participation. Entering scores and weights shows your overall grade.

An investor holds three funds in different amounts. The weighted average return reflects how much money is in each.

Common mistakes to avoid

• Giving every value equal weight.
• Using weights that do not match the syllabus.
• Mixing percentages and decimals in the weights.
• Leaving out a category with no score yet.

💡 Practical tip: Weights do not need to add up to 100, but they must be on the same scale.

Tips for better results

• Check that weights reflect the real importance of each part.
• Use the same unit for all weights.
• Add a zero for missing work to see the worst case.

Related tools