Fibonacci retracement levels are among the most widely watched tools in technical analysis. Here's where the numbers come from, how to draw them, and why so many traders react to the same levels.
Fibonacci retracement is a technical tool that identifies potential support and resistance levels based on the Fibonacci sequence — the same mathematical sequence found throughout nature. Traders draw it from a swing low to a swing high (or vice versa) to find likely pullback zones within an ongoing trend.
The key ratios — 23.6%, 38.2%, 50%, 61.8%, and 78.6% — are derived from dividing numbers in the Fibonacci sequence by others near them in the sequence. 50% isn't technically a Fibonacci ratio but is included because markets so often retrace almost exactly halfway. None of this has a proven fundamental cause; the levels matter because so many traders watch and act on them, which becomes partly self-fulfilling.
In an uptrend, click the tool at the most recent significant swing low and drag to the most recent significant swing high. The tool then plots horizontal lines at each ratio between those two points — those lines mark levels where a pullback might find support before the trend resumes. In a downtrend, the process is reversed: draw from the swing high down to the swing low to find resistance levels for a bounce.
The 61.8% retracement (the "golden ratio") is the deepest pullback traders will typically still call a healthy correction rather than a trend reversal. Some traders watch the zone between 61.8% and 65% — sometimes called the "golden pocket" — as a high-probability area for the original trend to resume. A retracement beyond roughly 78.6% is generally read as a sign the prior trend may be failing rather than merely pausing.
Fibonacci levels work best when they line up with something else — a prior swing high/low acting as horizontal support/resistance, a round number, or a moving average. A 61.8% retracement that lands exactly on the 200-day moving average is a far more convincing zone than a Fibonacci level sitting in open space with nothing else confirming it.
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