ATR vs Bollinger Bands

ATR and Bollinger Bands both measure volatility, but they present it differently. ATR is a single number for sizing stops; Bollinger Bands are a visual envelope that expands and contracts around price.

Quick answer: Use ATR to size stops and position risk as a raw volatility number, and Bollinger Bands to see volatility visually and spot squeezes or mean-reversion around price — they are complements, not rivals.

Side by side

	Average True Range	Bollinger Bands
Type	Volatility measure (single line)	Volatility envelope (channel)
What it measures	Average true range of each bar	Standard-deviation band around a moving average
Output	One number in price units	Upper, middle and lower bands on the chart
Primary use	Stop-loss and position sizing	Squeeze breakouts and mean reversion
Direction	Directionless — magnitude only	Shows position of price within the range
Signal	No trade signal by itself	Band tags, squeezes and walks
Scale	Price units (points/rupees)	Price units, plotted around price

A number versus a picture

ATR reduces volatility to one figure — the average true range over the last 14 bars — expressed in the instrument's own price units. If Bank Nifty's ATR is 450 points, that is your yardstick for how far it typically travels in a session. Bollinger Bands instead wrap price in a channel set two standard deviations above and below a 20-period average, so you see volatility as the visible width of the envelope. ATR gives you a scalar for calculations; Bollinger Bands give you a spatial read of where price sits.

Different jobs on the chart

ATR does not tell you direction or generate entries — its job is risk. Traders place stops a multiple of ATR away from entry (say 1.5× ATR) so the stop adapts to current volatility, and they size positions so that an ATR-based stop risks a fixed rupee amount. Bollinger Bands are a signal tool: a squeeze (bands contracting) warns that a big move is coming, band tags flag mean-reversion points in ranges, and a 'walk' up the upper band signals a strong trend. They answer different questions — how much risk versus where and when.

How they work together

The two pair naturally. In a Bank Nifty setup you might use a Bollinger squeeze to anticipate a breakout, enter on the band break, and then use ATR to place the stop and size the trade so the volatility of the move itself defines your risk. Note that Bollinger Bands already embed volatility through standard deviation, so the two are related — but ATR uses the true range (which captures gaps) while Bollinger uses closing-price deviation, so they are not identical measures.

The verdict

ATR and Bollinger Bands are not competitors — one is a volatility number for risk, the other a volatility picture for signals. Use ATR to set stops and size positions, use Bollinger Bands to spot squeezes and fades, and combine them so the same volatility that triggers a trade also defines its risk.

FAQ

What is the difference between ATR and Bollinger Bands?

ATR expresses volatility as a single number in price units, mainly for setting stops and sizing positions. Bollinger Bands express volatility visually as a channel around price, used for spotting squeezes and mean reversion. One is a number, the other a picture.

Should I use ATR or Bollinger Bands for stop-loss?

ATR is the better tool for stops because it gives a volatility figure you can multiply, for example placing a stop 1.5× ATR from entry. Bollinger Bands can also inform stops, but ATR is purpose-built for adaptive risk sizing.

Do ATR and Bollinger Bands measure the same thing?

Both measure volatility but differently. ATR uses the average true range, which captures gaps, while Bollinger Bands use the standard deviation of closing prices. They are related but not identical, so their readings can diverge.

Can Bollinger Bands generate buy and sell signals?

Yes. Band tags can mark mean-reversion entries in ranges, a squeeze warns of an impending breakout, and price walking along a band signals a strong trend. ATR, by contrast, generates no directional signal on its own.

Which is better for Bank Nifty volatility?

It depends on the job. For measuring how far Bank Nifty typically moves and sizing stops accordingly, use ATR. For visually spotting expansion, contraction and mean-reversion around price, use Bollinger Bands. Many traders use both.

Can I use ATR and Bollinger Bands together?

Yes, and they complement each other well. A common approach is to use a Bollinger squeeze to anticipate a breakout, enter on the band break, then use ATR to place the stop and size the position for the trade's volatility.

Read the full guides: Average True Range · Bollinger Bands.