Technical analysis

Fibonacci Retracement in Trading: a Practical Example

Astron Team · 09/24/2026 · 4 min read

Fibonacci retracement is one of the most used — and also one of the most misused — tools in technical analysis. The core idea is simple: after a strong price move, a partial correction tends to stop at specific levels before the original move continues. The problem shows up when someone treats these levels as exact guaranteed entry points, instead of zones of attention.

The levels come from the numeric sequence described by the Italian mathematician Fibonacci, but you don't need to understand the math behind it to use the tool. What matters are the ratios derived from it: 23.6%, 38.2%, 50%, 61.8%, and 78.6% (the 50% level isn't technically a Fibonacci number, but is widely included because it represents the halfway point of the move).

How to draw the retracement

To draw the tool, you pick two points: the start and end of a relevant price move — a clear up leg or down leg on the chart. The platform automatically calculates the intermediate levels between these two points.

In an uptrend, you draw from the bottom to the top of the impulse. The retracement levels appear below the top, showing how far a correction can pull back before, potentially, the uptrend resumes.

A numeric example

Imagine an asset that rose from R$ 80.00 to R$ 100.00 — an impulse of R$ 20.00. Drawing the retracement of this move, the main levels would look like this:

• 23.6%: 100.00 − (20.00 × 0.236) = R$ 95.28
• 38.2%: 100.00 − (20.00 × 0.382) = R$ 92.36
• 50%: 100.00 − (20.00 × 0.50) = R$ 90.00
• 61.8%: 100.00 − (20.00 × 0.618) = R$ 87.64
• 78.6%: 100.00 − (20.00 × 0.786) = R$ 84.28

If, after the top at R$ 100.00, the price pulls back and finds support near R$ 87.64 (the 61.8% level), forming a reversal candle in that region, this meeting between the Fibonacci level and a price signal is the kind of confluence traders tend to look for — not the level alone, but the level plus other evidence.

Why the 61.8% level gets so much attention

Among the retracement levels, 61.8% tends to be treated as the most relevant for those looking for continuation of the original trend, as it represents a sizable correction without invalidating the prior move. A correction that goes past this level and deepens to 78.6% or beyond raises doubt about whether the original move still holds, or whether what's underway is a larger reversal, not just a pause.

Combining Fibonacci with other confirmation

Using the retracement in isolation, with nothing else, tends to generate premature entries — the price can pierce a level and keep falling (or rising) without respecting the marked zone. Common ways to reinforce the signal include:

• Checking whether the Fibonacci level coincides with an existing support or resistance on the chart, formed by previous highs or lows.
• Waiting for a reversal candle pattern in the level's region, instead of buying or selling as soon as the price touches the line.
• Checking a momentum indicator, such as the Stochastic, to see if it also shows signs of exhaustion in the correction move.

Common mistakes

A recurring mistake is drawing the tool on any small swing on the chart, without choosing a truly relevant move as the base. Another is ignoring the bigger picture: a Fibonacci retracement in a strong downtrend carries less weight when it goes against the dominant flow than when it's aligned with it. And, like any tool based on price geometry, it doesn't guarantee the price will respect any specific level — it only points to historically relevant reaction zones.

How to use this in practice

Fibonacci retracement works best as a map of attention zones rather than an automatic entry trigger. Marking the levels, waiting for the price to get close to one of them, and only then looking for confirmation from another technical element tends to produce more consistent entries than trading the touch on the line alone — always with a defined stop, since no Fibonacci level guarantees the price will react as expected, and the same numeric reasoning applies, in mirror image, to retracements in downward moves.