Force Index

Created by Alexander Elder, the Force Index depicts volume-based buying and selling pressure based on the change in price. [Discuss] 💬

chart for Force Index

// C# usage syntax
IEnumerable<ForceIndexResult> results =


lookbackPeriods int - Lookback window (N) for the EMA of Force Index. Must be greater than 0 and is commonly 2 or 13 (shorter/longer view). Default is 2.

Historical quotes requirements

You must have at least N+100 for 2×N periods of quotes, whichever is more, to cover the convergence periods. Since this uses a smoothing technique for EMA, we recommend you use at least N+250 data points prior to the intended usage date for better precision.

quotes is a collection of generic TQuote historical price quotes. It should have a consistent frequency (day, hour, minute, etc). See the Guide for more information.



Convergence warning: The first N+100 periods will have decreasing magnitude, convergence-related precision errors that can be as high as ~5% deviation in indicator values for earlier periods.


Date DateTime - Date from evaluated TQuote

ForceIndex double - Force Index


See Utilities and helpers for more information.


Results can be further processed on ForceIndex with additional chain-enabled indicators.

// example
var results = quotes

This indicator must be generated from quotes and cannot be generated from results of another chain-enabled indicator or method.