Support: Average Calculator

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Common questions

How do I find the average of a set of numbers?

Add them up and divide by how many there are. The average of 12, 15, 11, 15, 18, 20 and 14 is 105 ÷ 7 = 15.

What is the difference between mean, median and mode?

The mean is the sum divided by the count, the median is the middle value once they are in order, and the mode is the value that appears most often.

How do I find the median of an even number of values?

Put them in order and average the two middle ones. For 3, 5, 8 and 10, the median is (5 + 8) ÷ 2 = 6.5.

Can there be more than one mode, or none?

Yes. If two values tie for most common, both are modes. If every value appears once, there is no mode.

Should I use the sample or population standard deviation?

Use the sample (n − 1) when your numbers are a sample from a bigger group, which is the usual case in class and in spreadsheets (STDEV). Use the population (n) when you have every member of the group (STDEV.P).

How do I work out a weighted average?

Multiply each value by its weight, add the results and divide by the sum of the weights. 90, 85 and 78 weighted 30, 30 and 40 give 83.7.

Is anything sent anywhere?

No. The working runs in your browser and nothing you type is sent to us or stored.