Supertrend: the trend indicator you can read at a glance
The Supertrend draws a single line that trails price from below in an uptrend and from above in a downtrend. Its visual simplicity hides a smart volatility-based construction —and a structural weakness you need to know.
How it is built
The Supertrend starts from the ATR (Average True Range), Wilder's volatility measure, and plots bands at a distance proportional to the median price:
Lower band = (High + Low) / 2 − (multiplier × ATR)
Common parameters: ATR period 10, multiplier 3
The design's key: the indicator only shows one of the two bands, and only switches when a candle closes on the other side. While the trend is up, the lower band acts as a dynamic support that rises with price (never falls); when a candle closes below it, the indicator flips and the upper band becomes dynamic resistance.
The signals
Bullish flip: price closes above the upper band → the Supertrend moves below price (green). Bearish flip: a close below the lower band → the indicator moves above (red). Between flips, the line itself serves as a trailing stop reference: the trend is considered intact as long as price does not close on the other side.
Because it is ATR-based, the Supertrend adapts to volatility: in quiet phases it hugs price and reacts fast; in violent phases it steps back and tolerates more noise without flipping. That adaptability is its big advantage over fixed supports or simple moving averages.
The structural weakness: sideways markets
Like every trend-following indicator, the Supertrend systematically loses money in sideways ranges: every oscillation of the range triggers a flip, and every flip arrives late. It is the unavoidable trade-off of its design —it captures long trend legs in exchange for chaining small false signals when there is no trend. That is why it works best filtered: taking its signals only in the direction of a higher timeframe's trend, or only when volatility is expanding (a squeeze breakout), removes much of the sideways noise.
Common mistakes
Trading every flip in any market regime. Using it on minute charts, where ranges dominate. Tuning the parameters until the past fits (over-optimization). And treating it as a complete system rather than what it is: an excellent visual trend manager and trailing-stop tool.
Frequently asked questions
What is the best Supertrend setting?
The most widely used is period 10 with multiplier 3. Higher multipliers (4-5) reduce false signals at the cost of later entries and exits; lower ones (1.5-2) react sooner but flip on any noise. As always, the standard setting keeps you comparable with the rest of the market.
Does the Supertrend repaint?
No: its flips are confirmed on candle close and are not redrawn afterwards. What can happen is that an intra-candle signal disappears if price returns before the close — which is why only closed-candle flips should be considered.
Supertrend or moving average crossover?
They measure the same thing (trend) with different logic: the 50/200 MA cross is slower and structural; the Supertrend, faster and volatility-adaptive. In practice they complement each other — the cross defines the macro bias and the Supertrend manages the ride within it.
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