Technical analysis

How to Use Fibonacci Lines in Trading

Astron Team · 09/24/2026 · 4 min read

Few technical analysis tools generate as much curiosity as Fibonacci lines. The idea that a mathematical sequence described hundreds of years ago helps predict support and resistance levels in the modern financial market sounds almost mysterious — but, in practice, the reason these lines work is simpler than it seems: many traders watch them, and by acting based on them, they help make them relevant.

In this article, you'll understand where the most used Fibonacci levels come from, how to draw them correctly, and how to interpret them alongside other elements of the chart.

Where the Fibonacci levels come from

The Fibonacci sequence is formed by always adding the two previous numbers (1, 1, 2, 3, 5, 8, 13, 21…). Dividing a number in the sequence by the next one, the result approaches 0.618; dividing by a number two positions ahead, the result approaches 0.382. These and other values derived from the sequence gave rise to the main retracement levels used in the market: 23.6%, 38.2%, 50%, 61.8%, and 78.6%.

It's worth noting that the 50% level doesn't come directly from the Fibonacci sequence, but is widely used for representing the intermediate retracement point of a move, and because of that it usually appears alongside the other levels in charting tools.

How to draw the Fibonacci retracement

To draw the retracement, you need to identify a clear price move — a well-defined up or down leg — and connect the start to the end of that move with the Fibonacci tool. Suppose an asset rose from R$ 40.00 to R$ 60.00. Drawing the retracement of that move, the 38.2% level would sit around R$ 52.36, the 50% level at R$ 50.00, and the 61.8% level around R$ 47.64.

These levels are read as possible pause or reversal zones for a correction: after rising from R$ 40.00 to R$ 60.00, it's common for the price to pull back part of that move before deciding its next step, and the Fibonacci levels help anticipate how far that correction can go without invalidating the original uptrend.

Which level tends to carry the most weight

Among the levels mentioned, the 61.8% one is usually considered the most relevant, often called the "golden retracement", for being tied to the golden ratio. A correction that stops near this level, without breaking beyond it, is often interpreted as a healthy correction within the main trend. A correction that goes past 78.6% and keeps falling raises doubts about whether the original trend still stands.

Combining Fibonacci with other chart elements

Fibonacci levels gain more strength when they coincide with another technical reference, like a support or resistance that already existed before the move, or a longer-period moving average. When several different tools point to the same price region, that confluence tends to be more reliable than an isolated Fibonacci level.

Using only the Fibonacci retracement, with no other confirmation, tends to generate entries at several different levels just because "it's a Fibonacci number", which isn't enough as the sole decision criterion.

Fibonacci extensions: beyond retracement

Beyond retracement, there are Fibonacci extensions, used to project possible targets beyond the point where the original move ended, with levels like 127.2% and 161.8%. While the retracement helps understand how far a correction can go, the extension helps estimate how far a new move, in the same direction as the trend, can extend.

The timeframe changes the reading

Like any technical analysis tool, the Fibonacci retracement varies in relevance depending on the timeframe it's drawn on. A retracement drawn over a move spanning several weeks on a daily chart tends to carry more weight than the same tool applied to a small move lasting a few minutes, simply because it reflects the decisions of a much larger number of market participants over a longer time.

Because of that, it's worth drawing the Fibonacci on the highest timeframe that makes sense for your trading horizon, and using a smaller timeframe only to refine the exact entry point within the already identified zone.

Applying it in practice

On Astron, you can draw Fibonacci retracements and extensions directly on the chart and test, on assets you follow, how the price has historically reacted to these levels. Like any technical analysis tool, Fibonacci doesn't guarantee the price will respect that exact number — it organizes possibilities, but the final decision to enter a trade or not should always factor in the risk of loss involved.