Choppiness Index

What it is

The Choppiness Index answers one question: is the market trending or chopping sideways? It compresses recent price action into a 0-100 score where HIGH readings mean choppy, directionless trade and LOW readings mean a strong trend is in progress — in either direction.

How it is calculated

Over the chosen period (default 14) it compares the total distance price actually traveled (the sum of true ranges) with the straight-line span of the window (highest high minus lowest low): 100 × log10(sum of TR / (highest high − lowest low)) / log10(period). If price wandered back and forth, the traveled distance dwarfs the net span and the score is high; if price went somewhere efficiently, the two are similar and the score is low.

How to read it

The pane shows the chop line with guides at the Fibonacci-derived levels 61.8 (upper) and 38.2 (lower). Readings above 61.8 mark a consolidating, range-bound market where trend-following signals tend to whipsaw. Readings below 38.2 mark strong directional movement where trend tools shine. The middle zone is transitional. Crucially, a falling chop line says a trend is strengthening but never says whether it is up or down — read the direction from price.

What to look for

• Trend filterContext

  chop below 38.2 confirms a trending regime — conditions favor breakout and trend-following approaches over mean-reversion.

• Trend filterContext

  chop above 61.8 flags a choppy, range-bound regime where oscillator and fade strategies typically work better than trend entries.

• SqueezeContext

  An extended stay at very high chop values marks a tightening consolidation — energy building for the next directional leg.

When to use it

A regime filter for any liquid market and timeframe: run it underneath your directional system and let it tell you which playbook applies. It is explicitly NOT directional — it grades trendiness, never bullishness — so it should never be the reason you buy or sell on its own. It is least informative on very short windows where a single bar can dominate the reading.

Works well with

Settings explained

period

The evaluation window (default 14). Shorter windows switch regime labels quickly but noisily; longer windows give a stabler regime call that lags transitions.

Limitations and common mistakes

• Completely non-directional — a reading of 25 could be a powerful rally or a waterfall decline.
• It describes the window just ended; regimes can flip right after an extreme reading.
• The 61.8/38.2 thresholds are conventions, not statistically derived boundaries.

References

• Origin: E.W. Dreiss, 1990s.

This page explains how an indicator is calculated and read. It describes past data, not what price will do next, and it is not a recommendation to trade. Read the disclaimers.

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