Decision tools built for clarity
Average Calculator
Find the arithmetic mean and a factual numeric summary.
Enter between 1 and 100 numeric values in the list.
Methodology
Formula or transformation
Adds the submitted values and divides their sum by the number of values to produce the arithmetic mean.
Variables
- Submitted values
- Number of values
- Sum of the values
- Arithmetic mean
- Minimum value
- Maximum value
Units
- Dimensionless value
Rounding policy
Decimal results are rounded to the declared result scale using half away from zero.
The arithmetic mean is the sum divided by the count; the calculator also reports the count, sum, minimum, and maximum.
Find the arithmetic mean and a factual numeric summary.
Reviewed sources
- NIST — Measures of location and arithmetic mean Reviewed on 2026-09-04
Formula review history
-
Initial formula and source review.
Reviewed 2026-09-04 for formula version arithmetic-mean-v1
Assumptions
- Every list item belongs to the same quantity and compatible unit.
- Each observation receives equal weight in the arithmetic mean.
Limitations
- The arithmetic mean can be distorted by extreme values.
- It does not describe distribution shape, uncertainty, or a weighted average.
Worked example
For 10, 20, and 30, the sum is 60 and the arithmetic mean is 60 ÷ 3 = 20.
Frequently asked questions
Is this a weighted average?
No. Every submitted value contributes equally.
Why can the mean differ from a typical value?
Large or small outliers can pull the arithmetic mean away from most observations.