The Gann Fan: Understanding the Magic Behind the Tool

Are you a fan of the Gann?

“People are afraid of what they don’t understand.” Some see a chart with a lot of lines on it and freak out. Others panic, simply b/c it’s too much to look at or understand. Don’t. Once you understand how to use tools like the Gann fan, and understand what you are looking at, it becomes easy to apply them to any chart or scenario for the benefit of your trading.

We should all note that the market rotates from angle to angle. This is referred to as the “rule of all angles”. The rule states that when the market breaks one angle, it will move toward the next one.

Of all of William Gann’s trading tools, Gann fans are the most well-known. For decades, the tool has been utilized to identify support and resistance levels and predict future price movements utilizing this rule of all angles.

How to Chart the Gann Fan Effectively

Gann believed that the stock market is geometric, cyclical and predictable. The key to his entire system is an ideal angle drawn across a price trend at 45 degrees. This is huge, and must be a true 45 degree angle relative to price action. The only way to be sure your charts are scaled correctly prior to measuring is to have your chart set to “auto scale.” If the angle of the 1/1 line is not at 45 degrees, the tool is essentially useless and misleading. An easy way to ensure this is accurate would be to draw out 45 degree angles from a high or low as shown below on the USOIL 60.

Update: The best way to get the perfect gann fan 45 degree angle every time is to use the gann square tool. Once you’ve overlaid the square onto your chart, open the settings and make sure all available fan levels are visible. Then make all arcs and levels not visible. Now each time you drop the fan, the angle will always be a perfect 45 degrees without having to measure.

Gann Fan - USOIL45s

After you have established a 45 degree angled trend line, simply trace the Gann fan tool directly over it as shown below:

Gann Fan - USOILGann

There are 4 lines above and 4 below this ideal 45 degree angle, all originating from the same price point and extending into the future at different geometric angles. The overall shape of the tool resembles a traditional Chinese hand fan, hence the name.

Support and Resistance

The 9 lines you’ve created all share support and resistance, and are strongest toward the middle of the fan. Look at them like the 1/1 is the big brother, with the 2/1 being the second youngest, the 3/1 being the third, and so on. I’ve drawn two on the chart above, one from a low and one from a high. The yellow areas below highlight that are obvious points of support or resistance to price action.

Gann Fan - Gann S-R

Consolidation and continuation patterns form when two fans form effective support and resistance levels. The tool follows standard breakout/breakdown rules when a support/resistance level is broken. Gann believed that as soon as price action completed a confirmed support or resistance line break, the broken line would then act as a barrier in the opposite direction (support becomes resistance and visa versa). This is exactly the same as standard support and resistance theory.


The Gann Fan packs and punch, and can open your eyes to a world of support and resistance that you haven’t experienced before. Couple it with distinct technical patterns like the rising wedge, or ascending broadening wedge, and it can help you determine key entry and exit points.

If your broker doesn’t provide Gann tools in their charting software, you might consider a different one. Read more on Best Brokers for Most Given Situations. If you still want to keep your broker, but want to upgrade charting abilities, consider using TradingView in tandem with placing trades through your broker.

Hope you learned something today. If so, share it with others.
Godspeed Traders.

Gann Fan

4 thoughts on “Gann Fan

  • February 19, 2016 at 7:10 pm

    The more I read about this, I think if you are looking for evidence of an uptrend, the price bars should be concentrated above the 1×1 45 d angle line, for the best probability the uptrend will continue, and the opposite for a downtrend.

    I’ve read the arcs act as Fibonacci time markers, and if the uptrend is strong, price should move up at the time when the price bars hits the arc.

  • January 2, 2017 at 8:01 pm

    Hi. Some help needed. While drawing the fan. I was told to lock the price scale so that the zoom in and out is as per scale. Is that correct way of doing it ? Or is should be on autoscale
    ? Thanks in advance.

    • January 31, 2017 at 5:33 pm

      Set scale to autoscale and lock. This should drop a 45 degree angle every time.

  • May 23, 2017 at 6:34 pm

    chart has to be scaled properly 1 to 1 for 45 degree angle to work consistently.

    instructions regarding 1 to 1 scaling in tradingview

    you can use other rational day and time and price correlations such 5 days = 50 points or dollars, 1 day = 10 points. but once you have a scale you are comfortable, lock the scale.

    I only use gann trading methodologies and publish charts forecasting time and price and short and longer term for the crypto asset market only.


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