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Bollinger bands calculator

Where the last close sits against its bands, and whether the market has gone quiet.

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  • No sign-up
  • Nothing you type is stored

The prices

Oldest first, separated by commas or spaces. Give more closes than the period to see the squeeze.
20 is the usual setting.
2 is the usual setting.

The bands

The last close of 99.33 is inside the bands, near the middle: %B is 0.58, with the bands at 97.81 and 100.44.

Middle band
99.12, the 20-close simple average; each band sits 1.31 (2 standard deviations) away.
Bandwidth
2.65% of the price. The bands are the narrowest of the last 21 readings: a squeeze. Quiet spells can end in a bigger move, but the bands do not say which way.
Read it with care
In a strong trend the price can ride a band for weeks. A touch of a band is a description, not a signal.

The last 5 closes against their bands. The last close is marked.

Close priceLowerMiddleUpper%B
99.8096.8399.33101.830.59
99.9597.4899.15100.820.74
99.8297.7299.07100.420.78
99.4897.7299.08100.430.65
99.3397.8199.12100.440.58

Education only, not investment advice. The answer comes from the numbers you typed in, not from your account or the market. Simulated results are hypothetical and have limits: real trading has slippage, gaps, changing results and emotions. Trading leveraged products can lose money quickly, including all of it. Risk warning

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Educational only, not financial advice; trading involves risk.

A moving average with a width

Bollinger bands draw a line two standard deviations above and below a 20-close average, so they widen when the price swings and narrow when it goes quiet. %B says where the close sits: 0 on the lower band, 1 on the upper, above 1 or below 0 outside them. The bandwidth is the gap between the bands as a share of the price.

A close outside a band is not a reversal on its own; strong trends walk along a band. A squeeze, the narrowest bands in a while, shows a quiet market, not the direction of the next move. Check the swing in numbers with the historical volatility calculator and the ATR calculator, and the one-sidedness of the moves with the RSI calculator.

Not advice. Arithmetic on the prices you type; an indicator describes the past.

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