What Are Fibonacci Retracement Levels? How Do You Draw Them?

Fibonacci retracement levels are a widely used technical analysis tool for estimating how much of a price move might be "given back." The name comes from the number sequence described by the 13th-century Italian mathematician Leonardo Fibonacci.

Where Do the Fibonacci Ratios Come From?

The Fibonacci sequence is one where each number is the sum of the two preceding numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89...

As you move further into the sequence, the ratio between consecutive numbers converges toward certain fixed values:

• The ratio of a number to the one right after it ≈ 61.8% (the golden ratio)
• The ratio of a number to the one two places after it ≈ 38.2%
• The ratio of a number to the one three places after it ≈ 23.6%

In technical analysis, a 50% level is also added on top of these — it isn't mathematically derived from the Fibonacci sequence, but it's widely used in practice.

How Do You Draw Fibonacci Retracement Levels?

1. Identify a clear swing low and swing high on the chart.
2. In an uptrend, draw from the low to the high to find retracement levels.
3. In a downtrend, draw from the high to the low.
4. The drawing tool automatically marks the 23.6%, 38.2%, 50%, 61.8%, and 78.6% levels on the price chart.

Example: A stock rises from 100 TL to 150 TL (a 50 TL move). After this rally, the potential retracement levels are:

23.6% level = 150 - (50 × 0.236) = 138.2 TL
38.2% level = 150 - (50 × 0.382) = 130.9 TL
50%   level = 150 - (50 × 0.500) = 125.0 TL
61.8% level = 150 - (50 × 0.618) = 119.1 TL

If price starts pulling back from 150 TL, these levels are watched as potential support zones.

How to Interpret Fibonacci Levels

• Shallow retracement (23.6% - 38.2%): Signals a strong trend, with buyers/sellers quickly regaining control.
• Moderate retracement (50%): Signals a balanced correction; the trend is usually still intact.
• Deep retracement (61.8% and beyond): Can signal the trend is weakening and a reversal may be underway. A drop below the 61.8% level is often read as a sign the trend has effectively failed.

Why It Works: The Self-Fulfilling Prophecy Effect

There's no strict physical or mathematical law behind Fibonacci levels — nothing forces a stock's price to reverse exactly at 61.8%. Much of the effect comes from the fact that so many traders watch the same levels: when thousands of orders cluster around the same price, that level genuinely becomes a meaningful supply/demand zone.

Common Mistakes

• Drawing Fibonacci from the wrong swing points, producing meaningless levels.
• Assuming every touch of a Fibonacci level guarantees a reversal — it's a probability zone, not a guarantee.
• Using Fibonacci in isolation, without confirmation from volume or candlestick patterns.

Conclusion

Fibonacci retracement levels are a tool for anticipating potential support/resistance zones within a trend — watched by a broad enough base of traders that the effect becomes partly self-fulfilling. Used alone, they don't produce a definitive signal; they're most valuable combined with RSI, volume, or candlestick patterns. On Lumina BIST you can study Fibonacci alongside 13 other indicators on the same chart, and get instant Telegram alerts whenever a support/resistance level you define is tested.