Average Calculator
Find the arithmetic mean, sum, count, minimum, and maximum of a number list.
How do I calculate an average?
The arithmetic mean is the sum of the values divided by how many values there are.
Formula: Average (arithmetic mean) = sum of all values ÷ number of values.
What this calculator does
Enter numbers separated by commas or spaces to calculate their arithmetic average and summary statistics.
Use it to turn Numbers into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this math calculation.
Inputs and what they mean
- Numbers
- — Separate numbers with commas, spaces, or new lines..
How to use it
- Enter a list of numbers separated by commas or spaces.
- Check that every entry is numeric.
- Read the mean, count, sum, minimum, and maximum.
Formula
Methodology type: scientific equation.
Methodology: NIST measures of location, unweighted arithmetic mean. Mean = sum ÷ count.
Average (arithmetic mean) = sum of all values ÷ number of values.
Inputs used: Numbers.
Edge handling: Numbers is required..
Worked example
Average of 12, 18, 25, and 30
- Start with Numbers: 12, 18, 25, 30.
- Apply the method: Average (arithmetic mean) = sum of all values ÷ number of values.
- Their sum is 85; divided by 4, the average is 21.25.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Unweighted finite numbers only; no missing-data or survey-weight correction.
- Extreme values can strongly affect the mean.
- For education and operational analysis only. No diagnosis, treatment recommendations, prescribing, dosing instructions, or reimbursement entitlement. Scientific calculations require appropriate laboratory verification; operational estimates do not replace local clinical, safety or financial policies.
- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this average calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Reference: NIST
Last reviewed:
Common questions
How do I calculate an average?
The arithmetic mean is the sum of the values divided by how many values there are. Check the formula, example, and limitations on this page before using the result for a real math decision.
Can I include negative numbers?
Yes. Negative and decimal values are supported.
Which type of average is used?
This calculator uses the arithmetic mean. Check the formula, example, and limitations on this page before using the result for a real math decision.
Does this show the median?
No. Use the dedicated median page; this page calculates the arithmetic mean and range endpoints.
How do I use the Average Calculator?
Enter the required values for Numbers. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Average Calculator use?
Average (arithmetic mean) = sum of all values ÷ number of values. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Sources
Method based on NIST.
Cite this page
Free Calculator. (2026, October 23). Average Calculator. https://freecalculator.tech/tools/average-calculator
"Average Calculator." Free Calculator, 23 Oct. 2026, https://freecalculator.tech/tools/average-calculator.
Average Calculator — Free Calculator, https://freecalculator.tech/tools/average-calculator
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