Bollinger bands calculator
Bands, %B and the squeeze from closes.
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Moving average envelope calculator
The average with a line a fixed per cent above and below it: where the close sits, and the width that really fits this market.
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The closes
The envelope
The close is above the upper line, +3.10% from its 20-bar average.
- The lines
- The 20-bar average is 2,370.18. With a 2.5% envelope the upper line is 2,429.44 and the lower line is 2,310.93; the close, 2,443.60, is 14.16 above the upper line.
- Does the width fit?
- In these bars the close went outside a 2.5% envelope on 11 of 61 bars (18%). A width of 3.1% would have held 95% of them: the market swings wider than this envelope.
- How it is read
- In a range, traders sell near the upper line and buy near the lower one, aiming for the average. In a trend, closes outside the line show strength, and the average itself becomes the line to hold.
- Read it with care
- The width is fixed, so the envelope does not widen when the market gets wild the way Bollinger or Keltner bands do. A close outside it can keep going.
The close, the lower line, the average and the upper line on the last bars. The last bar is marked.
| Bar | Close price | Lower | Average | Upper |
|---|---|---|---|---|
| 7 ago | 2,391.50 | 2,263.02 | 2,321.05 | 2,379.07 |
| 6 ago | 2,380.50 | 2,268.23 | 2,326.38 | 2,384.54 |
| 5 ago | 2,399.10 | 2,274.32 | 2,332.63 | 2,390.95 |
| 4 ago | 2,412.50 | 2,280.13 | 2,338.60 | 2,397.06 |
| 3 ago | 2,430.80 | 2,286.98 | 2,345.62 | 2,404.27 |
| 2 ago | 2,427.40 | 2,295.18 | 2,354.03 | 2,412.88 |
| 1 ago | 2,432.40 | 2,303.16 | 2,362.22 | 2,421.27 |
| Last | 2,443.60 | 2,310.93 | 2,370.18 | 2,429.44 |
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
Educational only, not financial advice; trading involves risk.
A fixed band around the average
The envelope is the oldest band on the chart: a simple average, with one line a set per cent above it and one the same per cent below. Because the width is a per cent of the price, not of recent swings, it stays the same in calm and wild markets. That makes it easy to read, and it means the width has to suit the market: this page tells you the width that would have held 95% of your closes.
For bands that widen with the swings, use the Bollinger bands calculator or the Keltner channel calculator; see how stretched the close is with the price z-score, and size the trade with the position size calculator.
Not advice. Arithmetic on the closes you type; an indicator describes the past bars, not the next one.
Next tools
Keltner channel calculator
EMA and ATR bands, squeeze check.
Price z-score calculator
How stretched the price is.
Pricing
Three ways in. Pick yours.
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Baroq never holds your money and never trades for you. Educational only, not financial advice; trading involves risk.