Average (Mean): Your Questions Answered
These are the questions people ask most often about average (mean). Each answer is short; follow the links for the full detail.
What does a average (mean) calculation tell me?
Finds the arithmetic mean of a list.
What is the formula?
Mean = sum ÷ count.
What do I need to enter?
Numbers (separated by commas).
Can I use any units?
Yes, as long as every input uses the same unit. The answer will be in that unit (squared for areas, cubed for volumes).
Can you show an example?
For example, with these inputs:
- Numbers (separated by commas): 12, 15, 9, 22, 15, 30
the calculator returns:
- Mean: 17.1667
- Sum: 103
- Count: 6
Any tips?
- Round only at the final step to avoid accumulated rounding errors.
- When numbers are very large or small, scientific notation makes them easier to compare.
- Check your answer by working backwards from the result.
Background
A quick mental estimate before calculating is a powerful check. If a room's floor area comes out at 4,000 square metres or a percentage comes out above 100% when it should not, you know to look again.
Calculators are best used to check working rather than replace it, especially for exams where method marks count. Work the problem by hand first, then confirm with the calculator.
Rounding is a common source of small errors. Keep full precision during intermediate steps and round only the final answer to the number of decimal places or significant figures the question asks for.
Related calculations
- Perimeter of a Rectangle Calculator: Calculates the perimeter of a rectangle from the measurements you enter.
- Perimeter of a Square Calculator: Calculates the perimeter of a square from the measurements you enter.
- Perimeter of a Triangle Calculator: Calculates the perimeter of a triangle from the measurements you enter.
- Perimeter of an Ellipse Calculator: Calculates the perimeter of an ellipse from the measurements you enter.
Try it yourself with the Average (Mean) Calculator.
Run your own numbers: Average (Mean) Calculator