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INDICATORS · MASS INDEX

Mass Index in Crypto: Why the Value Changes Before Candle Close

The Mass Index tracks range expansion with a ratio of smoothed high-low ranges. A wide live bar can push it toward its 'reversal bulge' threshold intrabar.

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

Short answer

Mass Index = sum over 25 bars of EMA(9) of (high − low) ÷ EMA(9) of that EMA. On the live bar, the range only widens, raising the single-smoothed EMA faster than the double-smoothed one, so the ratio and the 25-bar sum rise. The classic 'bulge' (above 27, then below 26.5) can be reached intrabar on a wide bar and not hold at the close. Use closed values.

Which part of Mass Index uses the live bar

ComponentUses current bar?Effect intrabar
Live range (H − L)YesOnly widens
EMA(9) of rangeYesRises faster
EMA of EMAYesRises slower
25-bar sumYesRatio of live bar included

The ratio responds to change in range, not its level, so a sudden expansion after quiet bars moves it most.

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How much it moves inside one bar

Mass Index during one bar (illustrative)Mass Index during one bar (illustrative): OPEN: Mass Index 26.4; MID: Wide bar: 27.2; LATE: Range stops growing; CLOSE: 26.9.OPENMass Index 26.4MIDWide bar: 27.2LATERange stops growingCLOSE26.9
Only Mass Index's closing value is kept in history. Original ChartsPod editorial graphic.
Illustrative intrabar range of Mass Index vs its closed valueIllustrative intrabar range of Mass Index vs its closed value: Intrabar peak 27 ; Closed value 27 .ILLUSTRATIVE INTRABAR RANGE OF MASS INDEX VS ITS CLOSED VALUEIntrabar peak27Closed value27
How far Mass Index travels inside a bar versus between bars. Original ChartsPod editorial graphic.

Rules

Mass Index signal hygieneMass Index signal hygiene: Signals on closed bars; Bar-close alerts; Backtest uses the same rule; Live value labelled provisional; Settings identical across chart and alerts.MASS INDEX 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.

The 27 / 26.5 thresholds are conventions; test them.

Review Mass Index in Crypto with bar replay before using it live.

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Questions readers ask

What does the Mass Index measure?

Range expansion via smoothed ranges.

Why does it rise intrabar?

The live range only widens.

Closed bars?

Yes.

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.