How to use this calculator
Paste an equally spaced ordered series and choose a smoothing rule.
Formula and method
SMA=window mean; WMA=Σwy/Σw; centered MA uses symmetric odd window; SES level Lₜ=αyₜ+(1−α)Lₜ₋₁.
Worked example
10,12,14,16,18,20 with a trailing 3-point mean projects 18 next.
Assumptions and supported scope
3–500 points; window 2–n; centered window odd; horizon ≤50. No trend/seasonality or prediction intervals. MAE/RMSE are in-sample one-step errors, not backtest evidence.
Method references
Method and worked example checked against the calculator implementation. About our methods · Report a correction