What Is a Kagi Chart?

Michael Whitman · Trading since 2017, full-time since 2020 · YouTube creator, 137K subscribers · Published 2026-09-14 · Updated 2026-10-19

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Most charts put time on the horizontal axis. A Kagi chart does not, and everything unusual about it follows from that one decision.

How to read it

The line extends in the direction price is moving. As long as price keeps going the same way, the line grows. Nothing else is recorded.

It turns only when price reverses by a preset amount — a fixed percentage, a fixed price, or a multiple of average range. Below that threshold, nothing is drawn at all.

Thickness carries the signal. The line is drawn thick when price exceeds the previous high and thin when it breaks the previous low. That switch is the traditional buy-and-sell cue.

So the chart is making a structural claim, not an indicator calculation — thick means higher highs are being taken out, thin means lower lows are.

The reversal setting is the chart

One parameter decides everything. A small reversal threshold produces a busy chart with many turns; a large one produces a few clean swings. Same price history, two completely different pictures.

That makes it unusually easy to fit to the past. Adjusting the threshold until the historical chart looks clean is a single-dial optimization, and a chart optimized that way tells you about the setting rather than about the market.

The honest way to use it is to fix the threshold first, tie it to something measured like average range, and leave it alone.

A worked example

Take a hypothetical market whose ordinary bar spans about 0.50, with runs in one direction that usually last two or three bars before turning.

Set the reversal at one ordinary bar — 0.50. Most two-bar runs will not clear it, so the great majority of the series produces no drawing at all. The chart becomes a handful of segments covering months.

Set it at a quarter of that — about 0.12. Now ordinary single bars trigger reversals, the line turns constantly, and the thick-thin switching happens often enough to be meaningless.

Neither is wrong; they are different instruments. And the choice between them is made by a person, before any signal exists.

The lag is the filter

The thickness change happens after price has already exceeded a prior extreme, which is necessarily after the move that got it there. That delay is not a defect being tolerated — it is the mechanism doing its job.

Every noise filter has the same trade. Refusing to draw small moves means refusing to signal on them, which means signalling later on the ones that matter. You cannot have the calm without the delay; they are the same property viewed from two sides.

The original data

A 5% reversal on a daily S&P 500 chart would have turned down at every one of the index’s 68 separate slides of 5% or more below a record between 1950 and 2026 — about one a year — and inside the bear markets it would have turned more often still.

Short runs explain why the reversal setting dominates. The same index closed up on 53.1% of trading days, so daily direction was close to a coin toss, and any threshold larger than about one bar’s range removes most of the history from the chart entirely — which is either exactly what you wanted or a catastrophic loss of information, depending on what you are trying to see.

And volume is absent. Kagi charts have no volume dimension, because there is no time period to attach it to.

Where it came from and what it assumes

Kagi charts originated in Japanese rice markets, alongside candlesticks, and they encode an assumption worth stating: that price movement matters and elapsed time does not.

That assumption is defensible in some contexts and not others. A market that moves 2% over two days and one that moves 2% over two months produce the same drawing, and whether those two situations are genuinely equivalent depends entirely on what you are trading and why.

For a position held over months it is often reasonable. The path is what matters and the calendar is incidental.

For anything with a deadline it is not. An option expires on a date, financing is charged per night, and a chart with no time axis cannot tell you how many of those have passed. Combining a Kagi reading with any dated instrument means reintroducing the dimension the chart deliberately removed — which is possible, and has to be done deliberately rather than forgotten.

And it pairs badly with a stop. The chart shows no intraday range, so any level taken from it is chosen without knowing how far price actually traveled inside a segment. A bar several times the size of an ordinary one looks no different inside a segment — a factor the drawing never displays.

How this connects

A chart that ignores time entirely, plotting only price moves larger than a threshold - which puts it beside renko and point-and-figure charts.

The reversal amount is the only setting, and it decides everything about what the chart looks like.

It is a market trend tool by construction. Filtering out small moves makes direction easier to see and makes the chart useless for anything timing-sensitive.

Volatility changes its meaning silently. A fixed reversal amount is a large filter in a quiet market and a small one in a fast market.

And the line break chart is a close relative, applying the same time-free idea with a different rule for when to reverse.

When it fails

The characteristic failure is reading the clean appearance as reliability. A Kagi chart of the past shows a small number of decisive turns with no clutter, and that legibility is easily mistaken for a method that catches turns well. It does not catch them well — it draws only the ones large enough to clear the threshold, after they have cleared it, and omits every failure that did not reach the line. The chart is clean because the misses were never drawn.

A second failure is tuning the reversal on historical data. One dial, fitted to the past, is the easiest over-fit available on any chart type.

A third is losing track of when a signal actually printed. Without a time axis it is genuinely hard to tell how many sessions passed inside one segment.

A fourth is combining it with time-based indicators, which assume evenly spaced periods the chart does not have.

And a fifth is trading it without backtesting the threshold you actually intend to use, since the setting and the strategy are inseparable here.

Related

Market trend covers the higher-high structure the thickness is claiming. Technical analysis covers the tradition it belongs to. And volatility covers the bar sizes the reversal threshold has to be set against.

This page is educational, not financial advice. Test every idea on your own charts before risking money. Some links on this page earn a commission if you buy through them. It costs you nothing and it does not decide what appears here or in what order — how these pages are made is set out in our methodology.