Double bottom

A double bottom is a bullish reversal pattern consisting of two lows at approximately the same price level separated by a rally (the peak). The pattern reveals that price has tested a support level twice and bounced both times, showing persistent buying interest. The first bottom exhausts sellers; the price rallies. Sellers try again, pushing price down toward the prior bottom, but buying intensity halts the decline. When price then rallies above the peak’s high, the pattern is complete, and a sustained uptrend often follows. The double bottom is the bullish mirror of the double-top and is similarly common but considered less reliable than the inverse head and shoulders.

How double bottom forms

A downtrend reaches a low (first bottom) where buyers step in, causing price to rally. Sellers return and push price back toward the prior low (second bottom). However, buying pressure at the same support level prevents price from breaking below. The two troughs at approximately the same level reveal that support is firm and selling power is insufficient to overcome it.

The peak between the troughs acts as resistance. When price eventually breaks above the peak high, it signals that sellers have finally surrendered, and buyers are in control.

The peak

The peak is the high point between the two troughs. It acts as resistance during the pattern and becomes a key level: breaking above it confirms the reversal. The height of the peak affects the pattern’s significance—a tall peak (large rally) shows greater conviction than a shallow one.

Volume behavior

During the first bottom, volume is typically robust as sellers aggressively push lower. During the second bottom, volume often declines, revealing less selling conviction. On the breakout above the peak, volume should surge, confirming buyers are stepping in.

Measuring the target

The measuring objective is calculated as the peak high plus the distance from the peak to the troughs. For example, if both troughs are at $50 and the peak is at $60, the measuring objective is $60 + $10 = $70.

Variations

Unequal troughs: The two lows are at slightly different levels. The pattern is still valid if they are close (within 1-3%).

Flat peak: The peak is not a sharp rally but a relatively flat zone.

Time between troughs: Troughs separated by weeks are more significant than those separated by days.

False breakouts

Price can briefly break above the peak on low volume, then reverse back below it. Traders who place tight stops above the peak risk being whipsawed. Waiting for volume and follow-up confirmation reduces this risk.

Trading a double bottom

Confirmation: Wait for price to close clearly above the peak high on increasing volume.

Entry: Buy on the breakout, or wait for a pullback to the peak for confirmation.

Stop-loss: Place below the troughs.

Profit target: Use the measuring objective.

Double bottom at major support

A double bottom at a significant support level (a round number, a prior swing low, a moving average) is more meaningful than one at a random level. The more important the support level, the more significant the bounce.

Comparison to other reversals

• Double bottom: Two troughs; simpler; moderate reliability.
• Inverse head and shoulders: Three troughs; more complex; higher reliability.
• Morning star: Three candles; reversal; different timeframe.

Real-world example

A stock declines to $50, rallies to $60, declines again to $51 (close to first bottom), rallies to $61 (peak), then closes above $61 on heavy volume. The measuring objective is $61 + $10 = $71.

Academic perspective

Academic research on double bottoms finds mixed results. Some studies suggest modest predictive power; others find the pattern indistinguishable from random occurrence.

See also