Average of scores
10, 12, 12, 15, 18Sum 67 / 5 values = average 13.4
Average Calculator
Use this free average calculator to add a number list, divide by count, and check median, mode, range, sorted values, and outlier context.
Inputs to checkExample numbersCopyable answerTab-only history
Average17.2222222222
- Mean
- 17.2222222222
- Median
- 18
- Mode
- 21
- Range
- 15
Steps
- Sort the data: 10, 12, 12, 15, 18, 21, 21, 21, 25.
- Add all values for sum 155 and divide by 9 to get the average.
- Use the middle value for the median and most frequent value for the mode.
- Subtract min 10 from max 25 for the range.
Recent answers
Recent answers will appear here.
Input tips
Separate values with commas, spaces, or new lines.
Average usually means the arithmetic mean: sum divided by count.
How to use the Average Calculator
- Enter a list of numbers separated by commas, spaces, or line breaks.
- Press Calculate average to find the arithmetic mean.
- Review the sum, count, median, mode, range, and sorted values for context.
- Use examples, recent answers, or copy the average while checking your work.
What people use it for
Find the average test score, cost, time, rating, or measurement from one number list.
Check arithmetic mean homework with visible sum, count, and formula steps.
Compare mean with median, mode, and range when one value may be unusually high or low.
Summarize a small data set before copying the answer into notes or a spreadsheet.
Quick examples
Outlier check
8, 9, 10, 11, 42Average 16, median 10, range 34
Average with repeated values
72, 84, 84, 90, 93Average 84.6, mode 84
Average of decimals
1.5, 2, 2.5, 4Average 2.5
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Average CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- CalculatorsBrowse related calculators and utilities in the same category.
- Percentage And Ratio Calculator HubCompare this with the nearby tools and checks in the same job path.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Quick answers about formulas, inputs, examples, result copying, and private in-browser history.
What does average mean in this calculator?
Average means arithmetic mean. The calculator adds all values, then divides by how many values you entered: average = sum / count.
What formula does the Average Calculator use?
It uses sum divided by count. For 10, 12, 12, 15, and 18, the sum is 67 and the count is 5, so the average is 67 / 5 = 13.4.
What do the main Average Calculator inputs mean?
The main inputs are the numbers, operation, mode, or known values the calculator needs. Keep units consistent, enter percentages the way the page label shows, and use the examples as a quick check before trusting the answer.
How should I read the Average Calculator answer?
Read the headline answer, then check the supporting lines and examples to understand how the calculator got there. If one input changes, rerun the tool and compare the new answer instead of guessing.
What should I double-check before trusting the Average Calculator?
Check units, signs, rounding, and the selected mode before copying the answer. If the number feels weird, rerun one of the examples first, then put your own values back in slowly.
Can I enter values on separate lines?
Yes. Separate numbers with commas, spaces, semicolons, or new lines. The calculator reads them as one data set.
Can I use decimals or negative numbers?
Yes. Decimals and negative numbers work as long as each entry is a valid number. The sum, average, median, mode, and range update from the exact list you enter.
Why does the calculator also show median and range?
The average can be pulled higher or lower by extreme values. Median and range help you see whether the average tells the full story.
What if one value is much higher or lower than the rest?
That value still counts in the average, so it can pull the mean away from the middle of the group. Compare the average with the median and range before you summarize the data.
What mistake should I avoid with averages?
Do not mix unlike values in one list. Keep the same unit and same kind of measurement, then double-check any extreme value before trusting the average as a fair summary.
What happens if a value repeats?
Repeated values count each time they appear. If 84 appears twice, it contributes twice to the sum and count.
Is this a weighted average calculator?
No. This calculator gives every entered value equal weight. If grades, prices, or rates have different weights, use a weighted average workflow instead of treating every number as equal.
How many values can I enter?
You can enter up to 1,000 numbers. That keeps the browser calculation fast and readable.
Is my data private?
Yes. The calculation runs in your browser tab and recent answers stay only in that tab while you use the page.