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Technical AnalysisIntermediate

Fibonacci Fan

A Fibonacci fan is a set of diagonal trend lines drawn from a swing low or high through the 38.2%, 50% and 61.8% retracement levels of a move. The lines slope with time and mark possible support in uptrends or resistance in downtrends.

Fibonacci retracements are horizontal; real pullbacks unfold over time. The Fibonacci fan combines both ideas by angling the retracement levels into trend lines that start at a key swing point. As the trend ages, the support or resistance it marks moves with it. This entry explains how to draw a fan, how to read it and how it compares with ordinary retracements.

Category
Technical Analysis
Reading time
3 min
Also called
Fibonacci fans, Fib fan, Fibonacci fan lines
Updated

The Fibonacci fan in plain words

Fibonacci fan lines are trend lines built from Fibonacci retracement points.1

Rising fan lines start at a trough and pass through retracements of the advance, estimating support; falling fan lines start at a peak and estimate resistance.1

The key ratios — 38.2%, 50% and 61.8% — are the same ones used for retracements.2

How to draw a Fibonacci fan, step by step

  1. Pick a clear move

    A trough to peak (or peak to trough). See Swing High and Swing Low.

  2. Measure the move

    The vertical distance between the two points.

  3. Mark the retracements

    38.2%, 50% and 61.8% below the peak.

  4. Draw from the start

    Lines from the trough through each level at the peak's date.

  5. Extend the lines

    They project support into the future.

  6. Watch reactions

    Bounces or breaks at a fan line matter. See Support and Resistance.

Worked examples

Example 1 — Fan anchor points

Three fan lines

A stock rises from $100 (trough) to $150 (peak).

Example 1 — Fan anchor points — calculation
Move$50
38.2% level$150 − $19.10 = $130.90
50% level$150 − $25 = $125
61.8% level$150 − $30.90 = $119.10

Each fan line runs from the trough through one of these retracement points.1

Example 2 — Support on the fan

+$14

Weeks later the price pulls back and bounces on the 38.2% fan line, now at $134.

Example 2 — Support on the fan — calculation
Bounce level$134
Rally to$148
Gain from bounce+$14

Rising fan lines estimate support or potential reversal zones during pullbacks.1

Example 3 — Break of the last line

Trend weakens

Price closes below the 61.8% fan line.

Example 3 — Break of the last line — calculation
All fan lines brokenYes
ReadingUptrend in doubt

When the deepest fan line fails, the original advance is losing its structure. See Trend.

Fibonacci fan vs retracement

AspectFanRetracement
LinesDiagonalHorizontal
TimeBuilt inIgnored
Levels moveYes, with the trendNo
See alsoArcs and time zonesFibonacci Retracement and Extension

How traders use Fibonacci fans

  • Dynamic support

    Pullback entries in uptrends. See Pullback.

  • Dynamic resistance

    Rally exits in downtrends.

  • Trend health

    Breaking fan lines one by one weakens the trend.

  • Confluence

    Combine with horizontal levels. See Fibonacci Retracement and Extension.

Advantages and disadvantages

Advantages

  • Adds time to Fibonacci analysis.
  • Levels adjust as the trend ages.
  • Easy to draw on most platforms.

Disadvantages

  • Depends on chosen anchor points.
  • Angles change with chart scaling.
  • Many lines can be self-fulfilling or random.

Going deeper

Read as far as you need. Each level builds on the one before it.

Where the ratios come from

Beginner

The Fibonacci sequence, introduced to the West by Leonardo Pisano, produces ratios such as 0.618 and 0.382 that traders use for retracements.1

Scale sensitivity

Intermediate

Because fan lines are diagonal, their angle depends on the chart's price and time scaling, unlike horizontal retracements. See Linear and Logarithmic Scale.

Arcs and fans together

Advanced

Fibonacci arcs use the same 38.2%, 50% and 61.8% ratios but draw half circles, combining price and time differently.2 See Fibonacci Arcs.

Common mistakes

  1. Poor anchor points

    Use clear, significant swings.

  2. Changing chart scale

    Lines shift when the scale changes.

  3. Trading every touch

    Wait for a reaction.

  4. Using it alone

    Combine with price action.

Check your understanding

Test yourself before moving on. Each answer comes with an explanation.

Q1A move runs from $40 to $60. Where is the 50% point that a fan line passes through?
Q2In an uptrend, Fibonacci fan lines mostly estimate…

Key points to remember

  1. Fibonacci fans are diagonal lines from a swing point.
  2. They pass through 38.2%, 50% and 61.8% retracements.
  3. Rising fans estimate support; falling fans resistance.
  4. They add time to Fibonacci analysis.
  5. Anchor points and chart scale change the lines.

Frequently asked questions

Are Fibonacci fans reliable?

Like other Fibonacci tools, they highlight possible zones, not certainties.

Which ratios do fans use?

Usually 38.2%, 50% and 61.8%.

Do fans work on any time frame?

Yes, as long as the anchor swing is significant on that time frame.

Further learning

Sources

This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.

  1. StockCharts ChartSchool. Fibonacci Fans (opens in a new tab) Checked .
  2. StockCharts ChartSchool. Fibonacci Arcs (opens in a new tab) Checked .

Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.