Calculate Average
Add numbers and instantly find their mean.
- Values: 10, 20, 30, 40
- Sum = 100
- 100 ÷ 4 = 25
Quick Examples
Try these common average calculations
How to Calculate an Average
To calculate the average of a set of numbers, add all the values together and divide the total by the number of values.
For example, to find the average of 40 and 100:
40 + 100 = 140
140 ÷ 2 = 70
So, the average of 40 and 100 is 70.
Average Formula
Average = Sum of all values ÷ Number of values
For 10, 20, 30 and 40:
Sum = 10 + 20 + 30 + 40 = 100
Number of values = 4
Average = 100 ÷ 4 = 25
Average vs. Mean: Are They the Same?
In everyday mathematics, average usually refers to the arithmetic mean. It is calculated by adding all values and dividing by the number of values.
Other measures of central tendency include the median (the middle value) and mode (the most frequent value), so “average” and “mean” are not always interchangeable in every statistical context.
Examples of Average Calculations
| Numbers | Calculation | Average |
|---|---|---|
| 40 and 100 | (40 + 100) ÷ 2 | 70 |
| 10, 20 and 30 | (10 + 20 + 30) ÷ 3 | 20 |
| 20 and 50 | (20 + 50) ÷ 2 | 35 |
| 5, 10, 15 and 20 | (5 + 10 + 15 + 20) ÷ 4 | 12.5 |
When Is an Average Useful?
Averages are useful whenever you want to summarize several numbers with one representative value. Common examples include:
- calculating an average test score;
- finding average monthly spending;
- comparing average prices;
- analysing measurements or data;
- calculating average performance over time.
Popular tools
100% free
All tools are completely free
No login required
No sign up. No downloads. Just open and use.
Instant results
Get accurate results in seconds.
Works everywhere
Works on desktop, tablet and mobile devices.