Ulcer Index (UI)

Created by Peter Martin, the Ulcer Index is a measure of downside price volatility over a lookback window. Often called the “heart attack” score, it measures the amount of pain seen from drawdowns in financial market prices and portfolio value. [Discuss] 💬

chart for Ulcer Index (UI)

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


lookbackPeriods int - Number of periods (N) for review. Must be greater than 0. Default is 14.

Historical quotes requirements

You must have at least N periods of quotes to cover the warmup periods.

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.




Date DateTime - Date from evaluated TQuote

UI double - Ulcer 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 UI with additional chain-enabled indicators.

// example
var results = quotes