ATR: a volatility measure you mustn't confuse with a direction indicator

ATR (Average True Range) is the average of a candle's “true range” over recent periods. It tells you how many points the market usually moves, but not in which direction.

What it is

ATR also comes from Wilder (1978). The true range is the largest of three values: the high minus the low, the distance from the high to the previous close, or the distance from the low to the previous close. That way it accounts for gaps.

It's one of the most useful indicators, because it doesn't pretend to forecast. It describes the size of moves, which you need to know when planning risk.

How people use it

judging whether the market is calm or nervous today
comparing volatility across instruments
planning risk in units of volatility instead of fixed points
filtering out days with unusual volatility

What the research and evidence say

ATR is a measure, not a strategy, so there's no research on “whether ATR makes money”. What is known is that volatility tends to cluster: volatile days are often followed by volatile ones and calm days by calm ones, with a return to the average over the longer run. ATR captures this well, but it reacts with a lag to sudden changes, e.g. on the day of an important data release.

Weaknesses

it says nothing about direction
it reacts with a lag to sudden volatility spikes
an average of several days can hide that today's session is completely different
it doesn't distinguish between regular-session and overnight movement

What order flow shows

ATR tells you how much the market moves. Order flow tells you where that movement stops and why: at which prices liquidity appears in the book, where volume builds acceptance and where price flies through empty areas. Volatility plus the structure of the day is a much fuller picture than a number of points alone.

Indicators vs order flow

Every indicator and every pattern in this section is built from the same data: a candle's open, high, low, close and sometimes volume. They're derivatives of price, showing the effect rather than the cause. Order flow looks at what price is made of: who was buying and selling aggressively (delta), where limit orders were waiting (the order book) and at which prices the market accepted trade (the volume profile).

On CME futures this data is real and comes from one central market. Spot forex doesn't have it: platforms show tick volume, the number of price changes at a single provider.

To be fair: order flow isn't the Holy Grail. It takes learning, it can be noisy, big players hide some of their orders, and an edge only comes from a process and risk control. But it gives you information that simply isn't on a candlestick chart.

How to use it sensibly

use ATR to gauge the size of moves and to plan risk
on macro data days, remember that historical ATR understates the risk
compare regular-session volatility separately from overnight volatility

Glossary: ATR (Average True Range)
Glossary: Volatility
Atlas of biases: Ignoring regression to the mean
Order flow: The Initial Balance and day types: what the first hour says about the whole session
Also under the microscope: RSI
Also under the microscope: MACD
Also under the microscope: The stochastic oscillator and Stochastic RSI

Frequently asked questions

What does the ATR indicator show?

The average size of a single candle's move over recent periods, including gaps. It doesn't say whether the market will rise or fall.

Is a high ATR a buy signal?

No. A high ATR only means high volatility, in both directions.

Educational content, not investment advice. No signals, entries, stops or position sizes.