80% Rule

80% Rule mechanizes the 80% rule rotation setup from open to resolution: it builds the prior session's value area, classifies today's open against it, and signals only once price has re-entered the area and held inside for the acceptance time. Each step is marked on the chart and mirrored in a live status table.

The value area comes from a 25-row profile of the completed session, expanded around the point of control to 70% of its weight; the 60-minute default clock matches the classic two 30-minute periods of acceptance.

How to Trade the 80% Rule?

• Open outside value: a circle marks an open above or beneath the prior value area, the precondition, not yet a signal.
• Re-entry triangle: price closed back inside and the acceptance clock is running.
• 80% Rule label: acceptance confirmed (bullish after an open below value, bearish after an open above), targeting the opposite boundary, with the prior POC as interim reference.
• Outcome tags: ✓ marks rotation complete; ✕ marks a rejected re-entry or a stop-out back through the entry side.

Run it on a 30-minute or lower timeframe so the clock resolves cleanly, and cross-check the levels against a full volume profile when methods disagree.

80% Rule Settings

• Value Area % (default 70): share of the profile weight around the POC that defines value.
• Profile Rows (default 25): profile resolution; more rows sharpen the levels, fewer smooth them.
• Profile Weighting (default Volume): or TPO (Time) for symbols without reliable volume.
• Custom Session (default off): restricts the tool to a session window (default 0930-1600).
• Acceptance Time (Minutes) (default 60): time closes must hold inside value before the signal fires.
• Style toggles cover the value area box, POC line, signal labels, step markers and the status table.

Frequently Asked Questions

Does the 80% Rule work on daily charts?

How is this different from the Auction Failure indicator?

What does the 80% figure refer to?