What is a Double Top? Definition, Formula, and Example
A double top is a bearish reversal chart pattern formed by two consecutive peaks at roughly the same price level separated by a moderate trough, confirmed when price breaks below the trough's low.
Plain-English Definition
A double top is a bearish reversal chart pattern that forms after a sustained uptrend, marked by two distinct price peaks at roughly the same level separated by a pullback (the "neckline" trough). The pattern signals that buyers failed twice to push price higher at the same resistance, and the trend reverses once price closes below the trough between the two peaks. Traders read it as a hand-off from buyers to sellers — the second failed attempt at new highs is the tell.
How It's Calculated and Identified
A valid double top requires four structural elements:
1. Prior uptrend of at least 10–15% leading into the first peak.
2. Peak 1 and Peak 2 within ~3% of each other in price, separated by 2–8 weeks on a daily chart.
3. Trough (neckline) between the peaks, typically 5–15% below the peaks.
4. Confirmation: a daily close below the trough's low on volume at least 1.5× the 20-day average.
The price target after confirmation equals the height of the pattern subtracted from the neckline:
Target = Neckline − (Peak − Neckline)
Volume should decline on the second peak versus the first — a classic non-confirmation by participation.
Worked Example
NVDA printed a textbook double top in mid-2024. Peak 1 hit $140.76 on June 20, 2024. Price pulled back to $118.11 on July 5 (the neckline). Peak 2 reached $140.40 on July 10 — within 0.25% of the first peak — on noticeably lighter volume. Confirmation came August 2 when NVDA closed at $107.27, slicing through the $118 neckline on a 1.8× volume spike. Pattern height: $140.76 − $118.11 = $22.65. Projected target: $118.11 − $22.65 = $95.46. NVDA bottomed at $90.69 on August 5, exceeding the projection by 5%.
When Traders Use It
Swing traders and position traders use double tops to:
- Time exits on long positions before deeper drawdowns.
- Initiate shorts with stops above the second peak — a defined-risk setup.
- Sell covered calls at the second peak when the pattern is suspected but not yet confirmed.
- Confirm sector rotation when index components like SPY or QQQ print the pattern at major resistance.
The pattern is most reliable on daily and weekly timeframes; intraday double tops have substantially higher failure rates.
Limitations and Common Misconceptions
The double top's biggest failure mode is the false breakdown — price closes below the neckline, triggers stops, then reverses back above within 1–3 sessions. Estimates from Bulkowski's *Encyclopedia of Chart Patterns* put the failure rate around 17% on confirmed daily-chart breakdowns.
Three misconceptions:
- The peaks must match exactly. They don't — a 1–3% spread is normal and often healthier than identical peaks.
- The pattern is bearish before confirmation. It isn't. Until price closes below the neckline on volume, it's just two peaks and a pullback.
- All double tops project to full target. Only ~40% reach the measured move; many stop at the 50–61.8% Fibonacci retracement of the prior uptrend.
The pattern also performs poorly in strong bull markets, where buyers absorb the second peak and convert it into continuation rather than reversal.