A trader’s guide to using the parabolic SAR indicator

The parabolic SAR is designed for trend traders who want to know when a market’s momentum might change direction. Here, we explain what the parabolic SAR is, how to calculate it and how to use it in your trading.

What is the parabolic SAR indicator?

The parabolic SAR – or parabolic stop and reverse – is a technical indicator that is used to forecast potential reversals or continuations in an underlying market. A reversal can be a bullish market changing into a bearish market, or a bearish market changing into a bullish market, while continuations signify that a market will maintain its previous momentum. A trader can use the parabolic SAR to time their entry into a long or short position.

The indicator was first used by the same trader and analyst who created the relative strength index (RSI), J Welles Wilder Jr. He made the parabolic SAR with three primary functions: to highlight the current trend, to attempt to forecast a reversal in the prevailing trend, and to provide potential exit and entry signals during a reversal.

Parabolic SAR calculation

The parabolic SAR calculation is different depending on whether it is being used during an uptrend or a downtrend.

  • Uptrend: PSAR = Prior PSAR + Prior AF (Prior EP - Prior PSAR)
  • Downtrend: PSAR = Prior PSAR - Prior AF (Prior PSAR - Prior EP)

In this calculation, EP refers to the highest high for an uptrend and lowest low for a downtrend, updated each time a new EP is reached. The AF is a constant of 0.02, increasing by 0.02 each time a new EP is reached, with a maximum of 0.20.

However, many trading platforms – including the IG trading platform – enable you to overlay the parabolic SAR onto any price chart at the click of a button.

Practise trading today with an IG demo account

How to trade using the parabolic SAR

To trade using the parabolic SAR, you first need to understand what the different signals mean. The parabolic SAR will produce a series of dots – known as a parabolic line – above and below the price movements in an asset’s market chart. These dots will be either green or red.

When trading with the parabolic SAR, you would buy a market when the dots move below the current asset price and are green in colour. Alternatively, you would sell a market when the dots move above the current asset price and are red in colour.

After a series of red dots – indicating a bearish market – traders will often consider the first green dot to be a signal for a reversal from the prevailing trend. This is the time at which many will choose to close their current short position if they had one, and open a long position on the same market.

For a red dot following a series of green dots, the opposite is true. The series of green dots shows that the market is currently bullish. But, the first red dot will often serve as a signal for a trader to close their current long position and open a short position on the same market as the trend is reversing from bullish to bearish.

That being said, the signals provided by the parabolic SAR indicator are not always completely accurate and you should carry out your own fundamental analysis and technical analysis of each market that you wish to trade before opening a position.

Learn about how to manage your risk

The steps below can help you get started if you want to trade with the parabolic SAR indicator:

  1. Research the market you want to trade
  2. Carry out analysis on that market – both fundamental and technical
  3. Practise trading with the parabolic SAR with an IG demo account
  4. Create a live account when you’re ready to trade the live markets
  5. Open, monitor and close your position

Parabolic SAR trading strategies

The parabolic SAR trading strategy is essentially a trend trading strategy. It is used to identify a particular trend, and it attempts to forecast trend continuations and potential trend reversals.

For example, if the parabolic line is green, you would follow the bullish trend and keep your long position open. If the parabolic line was red, you would follow the bearish trend and keep your short position open.

But, if a green parabolic line is interrupted by one or two red dots, you might think about closing your current long position and opening a short position. On the other hand, if a red parabolic line is interrupted by one or two green dots, you might think about closing your current short position and opening a long position.

You can use other trend trading technical indicators alongside the parabolic SAR to attempt to confirm the prevailing trend or any potential trend reversals. Examples of trend trading technical indicators include the moving average indicator, the relative strength index (RSI) and the average directional index (ADX).

Learn more about trend trading

Parabolic SAR summary

  • The parabolic SAR is a technical indicator which traders use to attempt to forecast whether a prevailing trend will continue or reverse
  • The indicator is based on parabolic lines, which are a series of coloured dots
  • A series of green dots signals that the current trend is bullish
  • A series of red dots signals that the current trend is bearish
  • One or two red dots after a green parabolic line might signal a bearish reversal, and one or two green dots after a red parabolic line might signal a bullish reversal

This information has been prepared by IG, a trading name of IG Markets Limited. In addition to the disclaimer below, the material on this page does not contain a record of our trading prices, or an offer of, or solicitation for, a transaction in any financial instrument. IG accepts no responsibility for any use that may be made of these comments and for any consequences that result. No representation or warranty is given as to the accuracy or completeness of this information. Consequently any person acting on it does so entirely at their own risk. Any research provided does not have regard to the specific investment objectives, financial situation and needs of any specific person who may receive it. It has not been prepared in accordance with legal requirements designed to promote the independence of investment research and as such is considered to be a marketing communication. Although we are not specifically constrained from dealing ahead of our recommendations we do not seek to take advantage of them before they are provided to our clients. See full non-independent research disclaimer and quarterly summary.

Explore the markets with our free course

Discover the range of markets you can spread bet on - and learn how they work - with IG Academy's online course.

What is the number one mistake traders make?

We reveal the top potential pitfall and how to avoid it. Discover how to increase your chances of trading success, with data gleaned from over 100,00 IG accounts.


For more info on how we might use your data, see our privacy notice and access policy and privacy webpage.

You might be interested in…

Find out what charges your trades could incur with our transparent fee structure.

Discover why so many clients choose us, and what makes us a world-leading provider of spread betting and CFDs.

Stay on top of upcoming market-moving events with our customisable economic calendar.

Spread bets and CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 76% of retail investor accounts lose money when trading spread bets and CFDs with this provider. You should consider whether you understand how spread bets and CFDs work, and whether you can afford to take the high risk of losing your money. Spread bets and CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage.