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Chart basics

Volatility

Volatility is the degree to which an asset's price varies over a period; high volatility means large, fast price swings, low volatility means small, slow ones.

Also called: Price volatility · Market volatility · Historical volatility

Volatility describes the size of price swings. A stock that moves 0.5% on a typical day is low-volatility; a small-cap crypto that moves 8% is high-volatility. Volatility changes over time: quiet periods tend to be followed by expansion, and wild periods tend to calm down. It says nothing about direction, but it should shape how far away your stop goes and how large your position is.

How it works

Traders measure volatility in a few ways:

  • ATR (Average True Range): the average size of each candle’s range, including gaps, usually over 14 periods. Expressed in price units, it is easy to use for stops.
  • Bollinger Bands: bands set two standard deviations around a moving average. Narrow bands mean low volatility (a “squeeze”); wide bands mean high volatility.
  • Standard deviation of returns: the statistical measure behind historical volatility, often annualized.

Volatility is relative to the timeframe: a 1-hour ATR is much smaller than a daily ATR on the same asset. Low-volatility compression often precedes a breakout, while spikes in volatility often come with news, panic or liquidations.

Example

Two assets each trade at $100. Asset A has a daily ATR of $1.50; asset B has a daily ATR of $6. A trader risks $200 per trade and places the stop 1.5 × ATR from entry.

  • Asset A: stop distance $2.25, so position size = $200 ÷ $2.25 ≈ 88 shares.
  • Asset B: stop distance $9, so position size = $200 ÷ $9 ≈ 22 shares.

The dollar risk is the same, but the more volatile asset gets a quarter of the size. Using the same 50-share position on both would quietly quadruple the risk on asset B.

Common mistakes

  • Fixed stop distances for every asset. A $2 stop is wide for one stock and noise for another.
  • Ignoring volatility changes. A stop that fit last month can be far too tight after a news shock.
  • Confusing volatility with opportunity. Big swings cut both ways.
  • Trading the squeeze direction blindly. Low volatility predicts expansion, not its direction.

Read more in RSI, MACD, ATR and EMA explained and the Bollinger Bands guide.

Educational content — not financial advice.

Updated

Frequently asked questions

Is high volatility good or bad?

Neither. It offers bigger potential moves but also bigger losses and wider stops, so position size usually needs to shrink as volatility rises.

How is volatility measured?

Common measures are the Average True Range (ATR), the width of Bollinger Bands, and the standard deviation of returns over a chosen period.

Does volatility indicate direction?

No. Volatility measures how much price moves, not which way.