Arithmetic mean
For values x1, …, xn, x̄ = (x1 + … + xn) / n. That is also the value that minimises the sum of squared deviations.
Geometric mean
If every xi > 0, G = (x1x2…xn)1/n, computed as exp( (ln x1 + … + ln xn) / n ). Use it for average growth factors.
Harmonic mean
If every xi > 0, H = n / (1/x1 + … + 1/xn). Use it for average speed when distances are equal, or other rate problems.
Sample variance
s² = Σ(xi − x̄)² / (n − 1). The calculator reports s, not the population σ with n in the denominator.
FAQ
Weighted mean?
Not on this page. Repeat observations or compute Σw x / Σw elsewhere.
Type a problem on the calculator — it runs in this browser and nothing is uploaded.
Open the calculator — Mean Calculator