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INDICATORS · AROON

Aroon in Crypto: Why the Value Changes Before Candle Close

Aroon counts how many bars ago the highest high and lowest low occurred. A new extreme in the current bar resets one line to 100 instantly.

By ChartsPod Editorial Team · Reviewed by ChartsPod Research
Published · Updated · 5 min read

Short answer

Aroon Up = 100 × (N − bars since the N-period high) ÷ N; Aroon Down uses the low. If the live bar makes a new N-period high, Aroon Up jumps to 100 immediately; if price then reverses and doesn't hold, the bar still made that high, so Aroon Up stays 100 at close. What can change intrabar is whether the new extreme happens at all, so crossovers and 100 readings appear abruptly. Treat jumps as provisional until the bar closes and confirm with price structure.

Which part of Aroon uses the live bar

ComponentUses current bar?Effect intrabar
Bars since N-period highYes, if new high printsJumps to 0
Bars since N-period lowYes, if new low printsJumps to 0
Aroon Up/DownYesStep changes
Oscillator (Up − Down)YesLarge steps

Unlike averaging indicators, Aroon moves in steps. A single new high moves Aroon Up from, say, 40 to 100 at once; there is no smoothing to dampen it.

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How much it moves inside one bar

Aroon during one bar (illustrative)Aroon during one bar (illustrative): OPEN: Aroon Up 40; SPIKE: New 25-bar high: 100; FADE: Still 100 (high printed); CLOSE: 100.OPENAroon Up 40SPIKENew 25-bar high: 100FADEStill 100 (high printed)CLOSE100
Only Aroon's closing value is kept in history. Original ChartsPod editorial graphic.
Illustrative intrabar range of Aroon vs its closed valueIllustrative intrabar range of Aroon vs its closed value: Aroon Up jump on new high 60 ; Typical bar-to-bar change 4 .ILLUSTRATIVE INTRABAR RANGE OF AROON VS ITS CLOSED VALUEAroon Up jump on new high60Typical bar-to-bar change4
How far Aroon travels inside a bar versus between bars. Original ChartsPod editorial graphic.

Rules

Aroon signal hygieneAroon signal hygiene: Signals on closed bars; Bar-close alerts; Backtest uses the same rule; Live value labelled provisional; Settings identical across chart and alerts.AROON SIGNAL HYGIENESignals on closed barsBar-close alertsBacktest uses the same ruleLive value labelled provisionalSettings identical across chart and alerts
Closed values are what history shows. Original ChartsPod editorial graphic.

Because a printed high cannot be 'un-printed', Aroon's intrabar changes are usually one-directional within the bar; the vanishing risk comes from signals defined on crosses that depend on whether a new extreme appears.

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Questions readers ask

Why did Aroon jump to 100?

The current bar made a new N-period high.

Can it go back down in the same bar?

Not for that high once printed; it only changes as bars pass.

Use intrabar Aroon signals?

Wait for close and confirm structure.

Sources and methodology

Indicator formulas are standard definitions; live-versus-closed behaviour follows TradingView's repainting documentation. Values in examples are illustrative.

  1. TradingView Pine Script: Repainting — live vs historical calculation.
  2. ChartsPod indicator reference — indicator calculations.

This article explains research tools and workflows. It is not financial advice, does not recommend buying or selling any asset and does not predict prices. Crypto derivatives carry a risk of rapid and total loss of margin.

CHARTSPOD EDITORIAL EDITION · RESEARCH AND EDUCATION ONLY · NOT FINANCIAL ADVICE.