Average Calculator: Arithmetic Mean Formula With Steps
Arithmetic mean
Mean = sum of values ÷ count
Values separated by commas or spaces
Read each signed value relative to the zero baseline.
Mean = sum of values ÷ count
Worked example you can change
Mean = sum of values ÷ count
- Mean = (1 + 2 + 3 + 4) ÷ 4
- Mean ≈ 2.5
Calculator
Enter 1–1,000 decimal values separated by commas or ASCII whitespace, up to 32,768 characters total; each value has up to 15 significant digits and magnitude zero or 10⁻¹²–10¹².
- Count
- 4
- Arithmetic mean
- 2.5
Formula variants
| Shape or method | Formula | Meaning |
|---|---|---|
| Arithmetic mean | mean = Σx / n | Add all values, including their signs, and divide by the count. |
| Negative values | mean(−2, 0, 8) = 2 | Zero and negative observations count like any other observation. |
Questions
How do I calculate an average?
Add all the values and divide by how many values you entered. This calculator computes the arithmetic mean.
Can I include negative values and zero?
Yes. Signs are preserved in the total, and every observation contributes to the count.
Is this a weighted average?
No. Each entered observation has equal weight. For median and modes, use the linked mean, median and mode calculator.
Sources and method
Calculate the arithmetic mean of a number list. See signed values rebalance into equal shares, edit the worked example and inspect the sum and count.
We calculate with 40 significant digits and round only the displayed result. Diagrams are labelled explanations and are not measurement drawings.
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