Average Calculator
Mean, median, range & weighted average
Tip: you can paste a whole column of numbers straight from a spreadsheet.
How to Use
- 1Type or paste your numbers, separated by commas, spaces or new lines.
- 2The mean updates instantly, with count, sum, median, range and more.
- 3Switch to Weighted Average to give each number its own weight.
- 4Read the calculation steps below to see exactly how it was worked out.
Average Formulas
- Average (mean) mean = sum ÷ count
- Weighted average x̄ = Σ(wᵢ·xᵢ) ÷ Σwᵢ
- Median middle value of the sorted list
- Range range = max − min
Quick Examples
Tap an example to load it above.
Everything about the Average Calculator
A quick, practical guide to means, medians and weighted averages.
The average, or arithmetic mean, is the single number that best represents a whole set of values. You find it by adding all the numbers together and dividing by how many there are. This average calculator gives you the mean instantly, along with the count, sum, median, range and standard deviation, plus a separate weighted-average mode.
Averages are everywhere: exam and class grades, sports statistics, monthly expenses, product ratings and scientific measurements. Instead of adding long lists by hand, paste them here and read every key statistic at a glance.
Tip: The mean can be pulled off-centre by very high or low values (outliers). When that happens, the median, the middle value, often describes your data better.
How the average is calculated
The formula is simply the sum of the numbers divided by the count: average = (a₁ + a₂ + … + aₙ) ÷ n. For example, the average of 1, 2 and 5 is (1 + 2 + 5) ÷ 3 = 8 ÷ 3 ≈ 2.667.
What is a weighted average?
A weighted average lets some numbers count more than others. Each value gets a weight, and the result is Σ(weightᵢ × valueᵢ) ÷ Σ weightᵢ. For grades 70, 70, 80, 80, 80, 90 (that is 2×70, 3×80, 1×90) the weighted average is (2×70 + 3×80 + 1×90) ÷ 6 = 470 ÷ 6 ≈ 78.33.
How to use this calculator
- 1 Enter your numbers
Type or paste values into the box, separated by commas, spaces or new lines.
- 2 Read the statistics
The mean shows on the display, with count, sum, median, min, max, range and standard deviation below.
- 3 Use weighted mode when needed
Switch tabs, add a row per value, and give each one a weight to compute a weighted average.
- 4 Check the steps
The calculation-steps box shows the sum, the count and the division so you can follow the maths.
Frequently Asked Questions
How do I calculate an average?
Add all the numbers together to get the sum, then divide by how many numbers there are (the count). For 1, 2, 5, 2, 6, 6 the sum is 22 and the count is 6, so the average is 22 ÷ 6 ≈ 3.667.
What is the difference between mean, median and mode?
The mean is the sum divided by the count. The median is the middle value when the numbers are sorted. The mode is the value that appears most often. They can all differ, especially when the data is skewed.
What is a weighted average?
A weighted average gives some values more importance than others. Multiply each value by its weight, add those products, then divide by the total of the weights: Σ(wᵢ·xᵢ) ÷ Σwᵢ. It's common for grades where exams count more than quizzes.
What does standard deviation tell me?
Standard deviation measures how spread out the numbers are around the mean. A small value means the data is clustered close to the average; a large value means it's widely scattered. This calculator reports the sample standard deviation (dividing by n − 1).
How should I separate my numbers?
You can use commas, spaces or new lines, and you can mix them freely. That means you can paste a column copied straight from a spreadsheet and it will still be read correctly. Negative numbers and decimals are supported too.
Is this average calculator free and does it work on mobile?
Yes. It's 100% free, needs no sign-up and no download. It works in any modern browser and is fully responsive, so it fits phones, tablets and desktops. Your numbers stay in your browser; nothing is stored or shared.