Average of Three Numbers Calculator
Find the mean of three numbers instantly. Enter each value to see the sum and the average, which is handy for marks, measurements, readings and…
8 of 8 free uses remaining today
Find the mean of three numbers instantly. Enter each value to see the sum and the average, which is handy for marks, measurements, readings and quick everyday checks.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (first number = 12, second number = 18, third number = 24), the results are: sum 54; average 18.
Quick reference: first number vs result
Reference table based on the example values; it is not your calculation result.
| First number | Sum | Average |
|---|---|---|
| 6 | 48 | 16 |
| 12 | 54 | 18 |
| 24 | 66 | 22 |
| 60 | 102 | 34 |
| 120 | 162 | 54 |
| 240 | 282 | 94 |
Frequently asked questions
What formula does this calculator use?
Sum = a+b+c; Average = (a+b+c) ÷ 3. Variables: a = first number, b = second number, c = third number.
What do I need to enter?
You need first number, second number, third number. Results update as you type.
What is an example result?
With the default inputs (first number = 12, second number = 18, third number = 24), the results are: sum 54; average 18.
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