Need to find the average of a group of numbers? Our free Average Calculator makes it quick and easy. Enter your numbers, and the calculator will instantly find the average for you. It works with whole numbers and decimals, so you can use it for school, work, statistics, or everyday calculations.
Average Calculator
How to Use the Average Calculator
Using the Average Calculator is simple. Enter your numbers in the boxes and click Calculate Average. You can use the Add Number button if you need to enter more values.
The calculator will show the sum of your numbers, the total number of values, and the final average.
What Is an Average?
An average is a single value that represents a group of numbers. The most common type is the arithmetic mean.
To find an average, add all the numbers together and divide the total by the number of values.
Average Formula
The basic formula for calculating an average is:
Average = Sum of all values ÷ Number of values
For example, if the numbers are 10, 20, 30, 40 and 50:
10 + 20 + 30 + 40 + 50 = 150
There are 5 numbers, so:
150 ÷ 5 = 30
The average is 30.
Average Calculator Examples
Example 1: Average of Three Numbers
Suppose you want to find the average of 15, 20 and 25.
15 + 20 + 25 = 60
60 ÷ 3 = 20
So, the average is 20.
Example 2: Average of Test Scores
A student gets scores of 72, 85, 78 and 95 on four tests.
72 + 85 + 78 + 95 = 330
330 ÷ 4 = 82.5
The average score is 82.5.
Example 3: Average With Decimals
For numbers such as 12.5, 15.5 and 18:
12.5 + 15.5 + 18 = 46
46 ÷ 3 = 15.3333...
The average is approximately 15.33.
Why Use an Average?
Averages are commonly used to summarize a group of numbers with one easy-to-understand value. You might use an average to calculate test scores, monthly expenses, sales figures, temperatures, ratings, measurements or other numerical data.
Average vs. Median
Average and median are not always the same.
The average is calculated by adding all values and dividing by the number of values. The median is the middle value after the numbers have been arranged from smallest to largest.
For example, with 2, 3, 4, 5 and 20, the average is affected by the larger value of 20, while the median is 4.
Frequently Asked Questions
How do I calculate an average?
Add all the numbers together and divide the total by the number of numbers.
Can I calculate the average of decimal numbers?
Yes. The calculator supports both whole numbers and decimal values.
Can I enter more than four numbers?
Yes. Click Add Number to add as many number fields as you need.
What happens if I leave some boxes empty?
Empty boxes are ignored. Only the numbers you enter are included in the calculation.
Is the average always a whole number?
No. An average can be a decimal, depending on the numbers being calculated.
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