What is an average calculator?
An average calculator combines a set of values into a single central value. This page supports the arithmetic mean and weighted average. For percentage-based comparisons, open the Percentage Calculator.
How does the average calculator work?
Arithmetic mean mode adds the values and divides by the number of values. Weighted mode multiplies each value by its matching weight, adds those products, and divides by the sum of the weights.
What formulas does the calculator use?
If your data is expressed as ratios, the Ratio Calculator can help simplify them first.
How do you use this average calculator?
- Select Arithmetic mean or Weighted average.
- Enter your values separated by commas, spaces, semicolons or line breaks.
- For weighted mode, enter one weight for each value.
- Select Calculate Average and review the result and summary.
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For optional supporting equipment or reference material, you can browse Scientific calculators (paid link) on Amazon.com. Compare a separate calculator for checking suitable arithmetic and functions. Check angle mode, input conventions and rounding before comparing answers. No purchase is required to use this calculator.
Average calculator examples
For 10, 20, 30 and 40, the arithmetic mean is 25. For values 10, 20 and 30 with weights 1, 2 and 1, the weighted average is 20. The Fraction Calculator is useful when inputs need exact fraction arithmetic.
What should you know about averages?
An arithmetic mean does not always describe a skewed data set well because outliers can pull it upward or downward. This tool does not replace a full statistical analysis. For powers or roots used in formulas, see the Exponent Calculator.
Worked example: Average
Enter the following values in the Average Calculator and calculate to reproduce this result.
- Average type: Arithmetic mean
- Values: 10, 20, 30, 40
Example result: 25. The arithmetic mean of 4 values is 25.
Calculation used: 100 ÷ 4 = 25
How to interpret this example
The mean gives every entered number equal weight. Here the sum is 100 and there are four values, so 100 ÷ 4 = 25. A class grade or price average with unequal weights needs a weighted calculation instead.
Frequently asked questions about averages
Methodology and calculation scope
The page parses finite JavaScript numbers and supports up to 10,000 values per calculation. Weighted mode requires the same number of values and weights, nonnegative weights, and a positive total weight.