The Supertrend is one of the most popular indicators among Indian traders. It draws a single line that sits below the price in an uptrend and above it in a downtrend, flipping sides when the price closes through it. Its simplicity is its appeal: green or red, long or short.
This article explains how the Supertrend indicator is calculated from the average true range, works through an example, explains popular settings, and sets out why it performs well in trends and poorly in sideways markets.
How it is calculated
Supertrend has two settings: an ATR period and a multiplier. A common default is a 10-period ATR with a multiplier of 3.
Step 1. Find the midpoint of each bar: (high + low) ÷ 2.
Step 2. Calculate a basic upper band = midpoint + multiplier × ATR, and a basic lower band = midpoint − multiplier × ATR.
Step 3. Apply the trailing rules. In an uptrend, the line follows the lower band but is only allowed to rise, never fall. In a downtrend, it follows the upper band but is only allowed to fall. When the price closes on the other side of the line, the trend flips and the line switches to the other band.
Worked example. A bar has a high of 210 and a low of 200, so the midpoint is 205. With an ATR of 4 and a multiplier of 3, the band distance is 12.
Basic upper band = 205 + 12 = 217
Basic lower band = 205 − 12 = 193
If the stock is in an uptrend, the line sits at 193, or higher if an earlier value was higher. If it then closes below that line, the indicator flips to a downtrend and the line moves above the price.
What the signals mean
A flip to uptrend (line moves below price, usually drawn green) happens when price closes above the upper band line. Many traders treat it as a buy or long signal.
A flip to downtrend (line moves above price, usually red) happens when price closes below the lower band line, treated as a sell or short signal.
While the trend continues, the line acts as a trailing stop. In an uptrend it ratchets up as price rises, staying a few ATRs below; it never moves down. The trade stays open until price closes through it.
This makes the Supertrend a complete, if simple, trend-following system: one rule for entry, one for exit, and a built-in trailing stop that adapts to volatility through ATR.
Settings: the trade-off
A smaller multiplier, such as 2, places the line closer to price. Flips happen sooner and more often, catching moves earlier but producing more false signals.
A larger multiplier, such as 4, places the line further away. Flips are rarer and later, giving trends more room but surrendering more profit before exiting.
The ATR period controls how quickly the band distance adapts to changing volatility.
Timeframe matters as much as settings. The same 10, 3 setting on a five-minute chart and a daily chart produces completely different trading frequencies and holding periods.
Online discussions often promote a particular "best" setting. Any setting that looks outstanding on past data has probably been chosen because it fitted that data. Results on future data are usually more modest.
Why it whipsaws in sideways markets
Trend-following systems make money when prices move a long way in one direction and lose money when prices move back and forth.
In a range, price repeatedly closes just above the line, flipping it to uptrend, then just below, flipping it back. Each flip generates a trade, and each trade loses a little: the distance from the line plus costs. A string of these can produce a meaningful drawdown before the next trend arrives.
Nobody knows in advance whether the next period will trend or range. Traders using Supertrend have to accept the losing runs as the cost of being in the strong moves. Some try to reduce whipsaws by trading only in the direction of a longer-term trend, such as only taking long flips when price is above a long moving average, or by requiring confirmation from another indicator. Each filter also delays entries and misses some good trades.
Using it with futures and options
Futures fit the long-or-short logic directly, but leverage magnifies whipsaw losses. Size for a string of losing flips, not just one.
Option buyers using Supertrend flips face time decay during choppy periods, when flips come and go without follow-through. A lagging signal on a short-dated option leaves little time for the move to pay.
Option sellers sometimes use the line as a reference for which side to sell, for example selling puts below the line in an uptrend. The line is not a barrier; price can close through it in a day, and gaps can jump it overnight.
Apply it to the underlying or the future, not to option premiums.
Testing it honestly
Write the exact rules. Settings, timeframe, entry on the close or the next open, exits, and position size.
Include all costs. Brokerage, statutory charges and slippage on every flip. High-frequency settings can look profitable before costs and lose after them.
Test across different market phases, including long sideways periods, not just strong trending years.
Look at drawdowns, not only profit. How long was the longest losing streak, and could you have kept following the rules through it?
Paper trade before risking money, and keep a journal comparing live results with the test.
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Frequently Asked Questions
What is the Supertrend indicator?
A trend-following line based on ATR that sits below price in an uptrend and above it in a downtrend, flipping when price closes through it.
How is Supertrend calculated?
Bands are set at the bar midpoint plus and minus a multiplier times ATR, then trailed so the line only moves in the trend's direction, flipping when price closes beyond it.
What is the best Supertrend setting?
There is no universally best setting. 10 and 3 is a common default; smaller multipliers flip sooner and more often, larger ones later and less often. Test any setting on your instrument and timeframe.
Why does Supertrend give false signals?
In sideways markets, price repeatedly closes on either side of the line, producing frequent flips that each lose a little.
Can Supertrend be used as a stop-loss?
Yes, many traders use the line as a trailing stop, but it cannot protect against gaps that jump past it overnight.
Related Reading
- The ATR calculation behind the line
- MACD as a momentum filter
- When a tested system goes cold
- Practising rules without real money
- Comparing live results with the test
- Costs on every flip
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
