Measure Rule

What is the Measure Rule?

The measure rule is the charting convention that a pattern projects a price objective equal to its own height. Measure the pattern's depth, from its extreme to the boundary price must break, then project that distance from the breakout point in the direction of the break. A rectangle's height is added to the top of the range, a head and shoulders projects the head-to-neckline distance from the neckline, and a flag projects the flagpole from the breakout, the so-called measured move. The logic is proportionality: the energy stored in a pattern is assumed to scale with its size.

It is a guideline, not a law. Pattern researchers, notably Thomas Bulkowski, documented that price reaches the full objective only part of the time, with rates varying by pattern, direction, and market. Practical use reflects that: some traders halve the height for a conservative objective, scale out into the full one, and always check whether the projection lands beyond obvious support or resistance. Pattern failure statistics are the honest companion to the rule.

How traders use it

• As a profit-target generator after a confirmed breakout: the projected objective becomes the first scale-out or the take-profit anchor in a broader target plan.
• As a trade filter before entry: if the measured objective sits behind a major level, or offers poor reward relative to the stop, the setup is skipped even when the pattern is clean.
• As an expectation-setting tool: comparing how far price actually travels against the objective helps judge whether a breakout is on track, stalling early, or extending beyond the pattern's implied energy.