Average True Range (ATR) is a technical indicator that measures how much an asset's price moves over a set period, usually 14 periods. It shows volatility, not direction. Traders use it to size positions and set stops at a sensible distance. J. Welles Wilder Jr. introduced it in 1978.
Key Takeaways
ATR measures the average size of price moves over a chosen period. The default is 14.
It tracks volatility only. A rising ATR says nothing about whether price is climbing or falling.
Traders use ATR multiples to set stop-losses, take-profit targets, and position sizes.
Low ATR means quiet markets, not safe ones. Calm periods can end abruptly.
ATR works best alongside readings of price action, support and resistance levels, or other trend tools.
What Is Average True Range (ATR)?
Average True Range is a volatility indicator from technical analyst J. Welles Wilder Jr. He published it in 1978 in "New Concepts in Technical Trading Systems." Unlike trend indicators, ATR doesn't point up or down. Rather, it measures the size of price moves.
You can think of it as a ruler for movement. A high ATR means prices are swinging widely. A low ATR means a tight range. Neither reading can tell you which way the next move will go.
Wilder built ATR into a wider system that includes the Directional Movement Index. It’s important to note that technical analysis treats volatility as context, not as a buy or sell signal.
How Do You Calculate ATR?
The math takes two steps. First, find the True Range for each period. Then average them.
Step 1: True Range
True Range is the largest of three numbers:
The current high minus the current low
The current high minus the previous close, as an absolute value
The current low minus the previous close, as an absolute value
The last two matter because they capture gaps. If a market jumps between sessions, the gap shows up in True Range even when the day's high and low look calm.
Step 2: Average it
Wilder's method starts with a simple average of the first 14 True Range values. After that, each new value updates like this:
ATR = ((previous ATR × 13) + current True Range) ÷ 14
This is Wilder smoothing, also called RMA or SMMA. It's not a rolling simple average. Each reading leans on the one before it, so the line moves smoothly. Many charting platforms use this method by default. Some use a simple moving average, which gives different values after sharp volatility shifts.
The result appears as a line below the price chart. It rises when volatility grows and falls when markets calm down.
What Does an ATR Reading Tell You?
A single ATR number can't tell you much by itself. Context comes from comparing it over time or across assets.
Raw ATR values aren't comparable across assets. An ATR of $500 means one thing for Bitcoin and something else for a small token. To compare, divide ATR by the closing price and multiply by 100. That gives ATR as a percentage.
How Do Traders Use ATR?
Most practical uses rest on one idea: let volatility decide how far your stop and take-profit sit from your entry.
Setting stop-losses
Instead of a round number, traders set stops at a multiple of ATR. A common choice is 1.5 to 2 times ATR below entry for a long position. If ATR is $5 and you buy at $100, a stop at $92.50 sits 1.5 ATR away. That distance lets normal noise pass but catches a real reversal.
Take-profit targets can use the same logic, often at 2 to 3 times ATR. Wider targets keep reward proportional to risk.
Sizing positions
ATR feeds directly into position sizing. If you risk a fixed dollar amount per trade, a wider stop means a smaller position. When ATR doubles, size should roughly halve to keep risk constant. Many bots recalculate this as volatility changes.
Judging breakouts
A breakout with rising ATR carries more weight than one while ATR falls. Rising ATR shows that range and participation both increased.
Why Do Crypto Traders Use ATR?
Crypto markets move more than most traditional ones, so fixed-dollar stops are unreliable. A stop that works on a calm day may sit inside normal noise in a volatile session.
Timeframes matter too. Scalpers on 5-minute and 15-minute charts often shorten the period to 7 to 9 for faster signals. Swing traders may use 21 or 28 for a smoother read. Scalping leans on shorter settings because holds are brief.
ATR-based trailing stops are widely available. They widen when volatility rises and tighten when it falls, which removes some manual work in fast moves.
What Are the Limitations of ATR?
ATR has three main weaknesses.
No direction: it measures price movements and not trends. A jump in ATR could mark the start of a rally or a sell-off, but you will need more confirmation from other indicators.
No standard threshold: there's no universal ATR level that signals a reversal. Readings depend on the asset, timeframe, and strategy.
Misleading in flat markets: in a tight range, small changes in ATR can look meaningful when they actually aren't.
Low ATR can be misleading. A quiet market looks safe, but calm spells often end with a sharp move. Traders who tighten stops in a quiet stretch get caught by that first expansion. Check ATR against support and resistance levels or a trend tool first. Don’t forget the wider lesson of volatility: it cuts both ways.
FAQ
What period setting is best for ATR?
14 is standard and works on daily charts. Scalpers often use 7 to 9 for faster signals. Swing traders may prefer 21 or 28 for a smoother line.
Can ATR alone tell me when to buy or sell?
No. ATR measures how much price moves, not where it's going. Use it for stops, position sizing, and risk control alongside price action or trend analysis.
What's the difference between ATR and standard deviation?
Both measure volatility differently. ATR uses True Range over a set period. Standard deviation measures how far prices sit from their average. ATR suits stops, while standard deviation suits statistical work and volatility bands.
Should I change ATR settings for crypto?
Often, yes. Crypto volatility differs from traditional markets. Shorter periods respond faster on active days. Tighter multiples may suit volatile assets. On quiet days, a fixed time-based exit can work better.
Why does my ATR value differ from another platform's?
Most likely a different smoothing method. Wilder's original ATR uses recursive smoothing, while some platforms apply a simple moving average. Period settings also differ. Check the method before comparing.
Closing Thoughts
ATR turns volatility into a number you can use. It won't tell you which way price will move, but it shows how far it typically travels. That's enough to set stops, size positions, and judge whether a move is unusual. As with most technical indicators, you should treat it as one input among several. ATR works best alongside price structure and a clear risk plan.