Relative Strength Index (RSI)

Created by J. Welles Wilder, the Relative Strength Index is an oscillator that measures strength of the winning/losing streak over N lookback periods on a scale of 0 to 100, to depict overbought and oversold conditions. [Discuss] 💬

chart for Relative Strength Index (RSI)

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


lookbackPeriods int - Number of periods (N) in the lookback period. Must be greater than 0. Default is 14.

Historical quotes requirements

You must have at least N+100 periods of quotes to cover the convergence periods. Since this uses a smoothing technique, we recommend you use at least 10×N 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 10×N 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

Rsi double - Relative Strength Index


See Utilities and helpers for more information.


This indicator may be generated from any chain-enabled indicator or method.

// example
var results = quotes

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

// example
var results = quotes