A technical analysis tool that uses horizontal lines at Fibonacci ratios (23.6%, 38.2%, 50%, 61.8%) to identify potential support and resistance levels during price pullbacks.
Fibonacci retracement is a technical analysis method that identifies potential support and resistance levels based on the Fibonacci sequence ratios. Traders draw the tool from a significant swing low to swing high (for an uptrend) or high to low (for a downtrend), and the tool plots horizontal lines at key Fibonacci percentages: 23.6%, 38.2%, 50%, 61.8%, and 78.6%.
The mathematical basis comes from the Fibonacci sequence (1, 1, 2, 3, 5, 8, 13, 21...), where each number is the sum of the two preceding numbers. The key ratios emerge from relationships between these numbers: 61.8% (the "golden ratio") comes from dividing a number by the next number, 38.2% from dividing by the number two places ahead, and so on. These ratios appear frequently in natural phenomena and, proponents argue, in financial market structures.
In Indian market practice, the 38.2% and 61.8% levels are the most commonly watched retracement zones. For example, if the Nifty 50 rallies from 18,000 to 22,000 (a 4,000-point move) and then pulls back, the key Fibonacci levels are: 23.6% at 21,056, 38.2% at 20,472, 50% at 20,000, and 61.8% at 19,528. Traders watch for price reactions at these levels — a bounce from the 38.2% level with bullish Candlestick Chart patterns confirms a shallow, healthy pullback.
The 61.8% level is considered the "make or break" zone. If price respects this level and bounces, the original trend is likely to resume. If it breaks below 61.8% retracement, the Correction may be deeper and the original trend is weakened. The 50% level, while not technically a Fibonacci number, is included because of its psychological importance — markets frequently find support or resistance at the halfway point of a move.
Fibonacci retracement is most effective when combined with other technical indicators. A confluence of the 61.8% Fibonacci level with a 200-day moving average and a previous support zone creates a "triple confluence" — one of the strongest support signals in technical analysis. On Indian stocks, this approach works well on daily and weekly charts. Many algorithmic trading systems on the NSE incorporate Fibonacci levels into their logic, which creates self-fulfilling prophecy effects at these levels.