Build Rules for Fibonacci Retracement Trades

This guide explains how Fibonacci levels are drawn, rules you can test, a worked example on Nifty, the limits of the method and how to make it objective enough to automate.

At a glance

How Fibonacci retracements are drawn

Pick a completed swing: a clear low and the high that followed it in an uptrend. The levels are the high minus a share of the move:

The 38.2% and 61.8% ratios come from the Fibonacci number sequence. The 50% level is not a Fibonacci ratio, but traders watch it because a half-retracement is a common pause point.

Extensions project targets beyond the high: the 127.2% extension is 25,400 + 0.272 × 1,200 = 25,726, and the 161.8% extension is 25,400 + 0.618 × 1,200 = 26,142.

The rules

Long trades

1. Trend: the swing is part of an uptrend, such as price above its 50-period average with higher highs and higher lows.
2. Zone: the price pulls back into the 50% to 61.8% zone.
3. Confirmation: a bullish reversal candle closes in the zone, such as a hammer or a bullish engulfing candle. See candlestick patterns.
4. Entry: above the high of the confirmation candle.
5. Stop: below the 78.6% level.
6. Target: half the position at the previous high, the rest at the 127.2% extension or on a trailing stop.

Short trades

The mirror image in a downtrend, with retracements measured up from the swing low.

A worked example

Using the swing above, Nifty futures pull back to 24,700, inside the 50% to 61.8% zone, and form a hammer with a high of 24,740.

• Entry: 24,745, above the hammer's high
• Stop: 24,440, below the 78.6% level, a risk of 305 points
• First target: 25,400, a gain of 655 points
• Second target: 25,726

One lot of 65 risks ₹19,825 for a first target of ₹42,575. The numbers illustrate the rules, not a result.

The limits of Fibonacci levels

• The swing is a choice. Two traders can pick different highs and lows and get different levels.
• There are many levels. With five levels close together, the price is near one of them most of the time. A level "working" is often hindsight.
• No proven edge on its own. Studies of Fibonacci levels have not shown that prices respect them more than other round numbers. Treat them as a way to plan entries and stops, and look for agreement with other evidence: prior support and resistance strategy, a moving average, VWAP or a round number.

Making the method objective

To backtest or automate the strategy, the swing must be defined by a rule, for example:

• the highest high and lowest low of the last 50 candles, with the low before the high for an uptrend, or
• a zigzag rule that marks a swing after a reversal of a set percentage, such as 2%.

With a fixed rule, the levels can be calculated the same way every time.

Automating a Fibonacci strategy

In QuantPower's strategy builder, express the zone as a price condition based on the swing rule, add the confirmation candle as an entry condition and the 78.6% level as the stop. Use market alerts if you prefer to confirm the candle yourself, and test the rules in paper trading.

Backtesting a Fibonacci strategy

• Fix the swing rule before you test, and do not change it to fit results.
• Compare entries at the 50% to 61.8% zone with entries at random points in the same pullbacks. If the levels add nothing, the results will be similar.
• Include trades where the price went straight through the zone.

See look-ahead bias: a swing high is only known after the price has turned, so a backtest must not use it before then.

Common mistakes

• Redrawing the levels after the fact. Pick the swing before the pullback, not after.
• Buying the level without confirmation. A falling price passes through every level on the way down.
• Ignoring the trend. Retracements are for trends. In a range, the levels mean little.

Frequently asked questions

Sources

• Murphy, J. J. (1999). Technical Analysis of the Financial Markets. New York Institute of Finance
• Kirkpatrick, C. D. and Dahlquist, J. R. (2010). Technical Analysis: The Complete Resource for Financial Market Technicians. FT Press