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Drawing tools · Gann

Gann fan

A Gann fan draws nine lines from a major pivot at fixed ratios of price to time: 1/8, 1/4, 1/3, 1/2, 1/1, 2/1, 3/1, 4/1 and 8/1. The 1/1 line advances one unit of price per unit of time; W. D. Gann regarded a market above its 1/1 angle from a major low as strong, and expected a break of one angle to lead to the next.

What it's for
  • Measure a trend's speed against fixed price-per-bar angles drawn from a major pivot.
  • Anticipate the next support or resistance angle when one is broken.
Plus and Pro toolTry it in Analyze
Points
2: the pivot, then a point on the 1/1 line
Plan
Plus and Pro
Angles
1/8 · 1/4 · 1/3 · 1/2 · 1/1 · 2/1 · 3/1 · 4/1 · 8/1 (price/time)
Unit
Price per bar, set by the second point

Construction

The first point is a major high or low. The second point defines the 1/1 angle: its slope, in price per bar, is the unit. The other lines multiply that slope: 2/1 rises two units of price per bar (steeper), 1/2 one unit every two bars (flatter). Each line is labeled price/time at the right edge.

How to read it

Gann fan from a major low; price rides above the 1/1 angle, closes below it, then finds support on the 1/2 angle
From the major low, the advance stays above the 1/1 angle. When it closes below it, the decline stops on the next flatter angle, 1/2, which holds as support before the trend resumes.
  • Above the 1/1 angle: price gains faster than one unit per bar, the trend is strong. Below it, the trend is weaker.
  • Angle to angle: a decisive break of an angle points to the next one as the next support (or resistance), the classic Gann reading.
  • Steep angles (2/1 and more) are rarely held for long; they describe accelerations.

How to draw it

  1. Choose Gann → Gann fan.
  2. Click the major pivot (a low for a rising fan, a high for a falling one).
  3. Click a second point: the 1/1 line passes through it. Drag it to change the unit; the whole fan rotates accordingly.

Limits

  • Without a deliberate choice of unit, a fan can be fitted to almost any chart after the fact.
  • Nine lines guarantee that price is always near one of them; only clear reactions count.
  • Gann's methods were never formally documented in a testable way; treat them as a framework for reading speed, not as rules.

Charts in this guide use simulated prices generated for illustration; levels and outcomes shown are examples, not observations of a real market. Educational content only, not investment advice.

Related guides

Gann boxPlusHow to draw a Gann box between two corners, read its price and time divisions (0.25, 0.382, 0.5, 0.618, 0.75) and its diagonals.Gann squarePlusHow the Gann square divides a price-time square into eighths with diagonals and arcs, and how analysts use it to time turning points.Fibonacci speed resistance arcsPlusHow Fibonacci speed resistance arcs are centered on the end of a move, cross it at 38.2%, 50% and 61.8%, and act as support that rises with time.Trend lineHow to draw a trend line on swing points, why the third touch matters, how to read a break, a retest and a change of slope.