Technical analysis · Intermediate

Parabolic SAR

Parabolic SAR draws a trailing stop on your chart that tightens as the trend runs. That makes it an exit tool, not an entry tool.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

In short

Parabolic SAR plots dots below price in an uptrend and above it in a downtrend, flipping sides when price touches them. Each new dot moves closer to price by an acceleration factor that increases as the trend makes new extremes, so the dots tighten the longer a move runs. It works best as a mechanical trailing stop in trending conditions, and it flips repeatedly at a cost in sideways markets.

What to remember

SAR is a decent exit and a poor entry. It flips on any touch, so in choppy conditions it reverses you repeatedly, each flip costing a spread.
The acceleration factor encodes an assumption: the further a trend has travelled, the less room it deserves. Changing the setting moves you along that trade-off, it does not remove it.
The dots know nothing about volatility or structure. A dot can sit inside ordinary daily noise or a pip away from a level that has held five times.
Pair it with a trend-strength filter. Acting on SAR only when ADX confirms a trend removes most of its worst behaviour.

Lesson 24 of 26 in Technical analysis

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A trailing stop drawn on the chart

Parabolic SAR plots a single dot per candle, above price in a downtrend and below it in an uptrend. The dots follow the trend and tighten as it extends. When price touches the dot, the indicator flips to the other side and the trend reading reverses. SAR stands for Stop and Reverse, which tells you what it was designed to do: exit one position and enter the opposite one, mechanically, with no discretion.

The mechanics matter. Each new dot moves closer to price by an acceleration factor that increases every time the trend makes a new extreme, typically starting at 0.02 and stepping up to a maximum of 0.20. So the longer a trend runs, the faster the dots close in. That is the parabolic part, and it encodes a specific assumption: the further a trend has travelled, the less room it should be given.

Why it is better as an exit than an entry

As an entry signal, SAR is poor. It flips on any touch, so in choppy conditions it will put you long, then short, then long again within a few candles, each flip costing you the spread and each one perfectly obedient to the rule.

As a trailing stop it is genuinely useful, because it solves a real problem: where to move a stop as a trade goes your way, without having to decide in the moment. The dots give you a price, updated every candle, that gets tighter as the move matures. That is exactly what a discretionary trader struggles to do consistently, because moving a stop on a winning position always feels either too early or too late.

Trailing a gold position

You are long gold from 2,340 with an initial stop at 2,320, a 20 point risk. Price runs to 2,395 over four sessions. The SAR dots have climbed from 2,318 to 2,372 in that time, tightening as the move extended.

Trailing your stop to the dot at 2,372 converts an open profit into a locked-in 32 points, where the original stop at 2,320 was still risking the whole position. Each further session the trend runs, the dots close in faster, so the share of the move you hand back at the turn keeps shrinking. What you give up is room: a normal pullback to 2,368 would take you out of a trade that then continues to 2,450. That trade-off is the entire character of this indicator, and there is no setting that removes it. The profit calculator makes the difference between the two exits concrete before you decide which style suits you.

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The acceleration factor

Higher acceleration (0.03 and up). Dots tighten faster, so you exit sooner, keep more of a sharp move and get shaken out of more normal pullbacks.
Lower acceleration (0.01). Dots tighten slowly, giving trends more room and giving back more of the profit at the turn.
The maximum step. Capping the factor at 0.20 stops the dots converging on price so fast that any trend is exited within a few candles.

Changing the setting does not make the indicator better, it moves it along the same trade-off between holding on and giving back. Pick the end of that trade-off that matches your holding period and leave it alone.

What the flip actually tells you

A SAR flip means one thing precisely: price touched a level that was calculated from the prior trend extreme and an acceleration schedule. It does not mean momentum has reversed, that a level has broken, or that anything structural has happened. The dot is a function of the trend so far, not a reading of current conditions.

Knowing that stops you attaching meaning to the flip that it cannot support. On a chart where price is pulling back to an obvious support zone, a SAR flip is simply the arithmetic catching up with a normal pullback. On a chart where price has broken a swing low at the same moment, the structure is the information and the dot is a coincidence.

What the dots cannot see

Ranges destroy it. Sideways markets produce a continuous series of flips, each one a small loss. This is not an edge case, it is most of the time on most instruments.
It has no concept of volatility. The dots are placed from price extremes and the acceleration schedule, not from how far the instrument normally moves. On a volatile day the stop can sit inside ordinary noise.
It ignores structure entirely. A SAR dot can sit a pip above a level that has held five times, or a long way from any level at all.
Reversing is rarely the right response. The reverse half of stop and reverse assumes that a trend ending means the opposite trend is starting, which is often not the case.

Exits only, filtered by ADX

Filter it with a trend-strength measure. SAR is designed for trending markets and is actively harmful in ranges, so pairing it with ADX and only acting on it when a trend is confirmed removes its worst behaviour. That combination is the standard fix and it is the one worth adopting first.

Then use it for exits only, and keep your initial stop from structure or a volatility multiple rather than from the dots. The initial stop decides your position size, and it should be placed where the idea is wrong, which the position size calculator then converts into lots. Once the trade is in profit, switching to the SAR dot as a trailing stop is a reasonable, mechanical way to manage the rest, and mechanical management is the part most people find hardest. More on that in the risk management guide.

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Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

FAQ

Parabolic SAR: questions

What is the acceleration factor in Parabolic SAR?

It controls how quickly the dots move towards price. The factor typically starts at 0.02 and increases by the same step each time the trend registers a new extreme, up to a maximum of 0.20. A higher setting tightens the trailing stop faster, keeping more of a sharp move but exiting on more ordinary pullbacks, while a lower setting gives trends more room and hands back more of the open profit at the turn.

Should you use Parabolic SAR for entries?

It is weak as an entry tool because it flips whenever price touches a dot, with no filter for whether a trend exists. In sideways conditions that produces a run of reversals in quick succession, each costing the spread. Most traders who keep it on the chart use it to trail a stop on a position they entered for other reasons.

Does Parabolic SAR work in ranging markets?

No, and this is its main weakness rather than an edge case. The indicator assumes a trend exists and flips sides as soon as price touches the dots, so a sideways market generates a continuous series of small losing reversals. A trend-strength measure such as ADX is the usual filter for switching it off when no trend is present.

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