Supertrend
ATR-based trailing-band indicator that flips direction when price decisively breaks through.
What it is
Supertrend is a relatively modern indicator (2000s, popularized in Indian markets) that combines ATR with HL2 (the average of high and low) to produce a single trailing line above or below price. The line follows price like a stop-loss, flipping sides when price decisively closes through it.
The result is a binary direction signal: when the Supertrend line is below price, the market is in an uptrend (line drawn green). When above, downtrend (red). This direction-only output makes Supertrend popular as both a regime filter and an entry trigger.
How it's calculated
Two parameters: ATR period (default 10) and multiplier (default 3.0).
1. Compute ATR over the period. 2. Basic upper band = HL2 + (multiplier × ATR) 3. Basic lower band = HL2 − (multiplier × ATR) 4. Final upper / lower bands are "ratcheted" — they only tighten in the direction of the trend, never expand backward. 5. The active line (upper if downtrend, lower if uptrend) is the Supertrend value. 6. Direction flips when price closes through the active line.
How to interpret signals
Direction. Price above the line = uptrend (line below price). Price below = downtrend.
Entries on flip. When direction flips from down to up, take a long. Symmetric for shorts.
Trailing exit. Hold the position as long as direction stays the same; exit on the next flip. This gives the strategy a built-in stop-loss.
Strengths
- Single line on the chart — visually clean compared with multi-line systems.
- Adaptive: ATR-based bands widen in volatility and tighten when calm.
- Built-in trailing exit — solves the 'where to exit' problem mechanically.
- Works on any timeframe; multiplier is the main tuning lever (3.0 standard, lower = more flips, higher = fewer).
Limitations
- Pure trend-follower: choppy or ranging markets produce frequent flips and whipsaws.
- The ratchet rule means the line can lag price recoveries during deep pullbacks.
- Multiplier choice is critical — wrong choice produces too few signals (high mult) or too many (low mult).
- No notion of trend strength — a barely-trending market and a strong trend produce the same binary signal.
Common pitfalls
- Trading every flip on a noisy timeframe without filters.
- Using default 10/3 on intraday charts where it produces too many flips.
- Combining Supertrend with another trend filter that gives the same signal — adds no information.
- Using a small multiplier (1.5×) hoping for more entries — drastically increases whipsaws.
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Educational note: This page explains what ST measures and how it is conventionally interpreted. It does not constitute investment advice. Past patterns do not guarantee future results, and no indicator works in all market regimes. See the full disclaimer.
Last updated: 2026-05-08