How to read Parabolic SAR indicator?

The Parabolic SAR helps traders identify trend reversals and dynamic stop-loss levels, performing best in strong trends when combined with other indicators like RSI or moving averages.

Jul 17, 2025 at 10:01 am

Understanding the Basics of the Parabolic SAR Indicator

The Parabolic SAR (Stop and Reverse) is a technical analysis tool primarily used in trending markets to determine potential reversals in price movement. It was developed by J. Welles Wilder, who is also known for creating the Relative Strength Index (RSI). The indicator appears on a price chart as a series of dots placed either above or below the asset's price. When the dots are below the price, it signals an uptrend, and when they are above, it indicates a downtrend.

The key function of the Parabolic SAR is to help traders identify entry and exit points. However, it performs best in strong trending markets and may produce misleading signals during sideways or choppy price action. Traders should be cautious and combine it with other indicators like moving averages or RSI to filter out false signals.

How the Parabolic SAR is Plotted on the Chart

The Parabolic SAR is calculated using a mathematical formula that incorporates the extreme point (EP) and an acceleration factor (AF). Here's how it works:

• When a new trend begins, the SAR is set at the extreme low (for an uptrend) or extreme high (for a downtrend).
• As the trend progresses, the acceleration factor increases, causing the SAR to move closer to the price.
• The SAR "accelerates" as the trend continues, hence the name "parabolic", because the dots form a parabola-like curve as they approach the price.

The formula for calculating the Parabolic SAR is:

SAR_n+1 = SAR_n + AF × (EP – SAR_n)

Where:

• SAR_n = Current SAR value
• AF = Acceleration Factor (usually starts at 0.02 and increases by 0.02 with each new extreme point)
• EP = Extreme Point (highest high in an uptrend or lowest low in a downtrend)

Interpreting Signals from the Parabolic SAR

The primary signal generated by the Parabolic SAR occurs when the dots flip positions relative to the price. Here’s how to interpret these signals:

• Dot moves from above to below the price: This indicates a potential bullish reversal, and traders may consider opening a long position.
• Dot moves from below to above the price: This suggests a bearish reversal, and traders may consider opening a short position.

It's important to note that false signals can occur, especially during consolidation or range-bound markets. For example, in a sideways market, the SAR may flip back and forth, generating multiple reversal signals that don't materialize into strong trends. To avoid this, traders often use a filter, such as waiting for a candle to close beyond the SAR level before acting.

Using Parabolic SAR for Stop-Loss Placement

One of the most practical applications of the Parabolic SAR is its use in managing stop-loss orders. Because the indicator follows the price in a parabolic manner, it provides a dynamic stop-loss level that adjusts as the trend progresses.

Here’s how you can apply it:

• In a long position, place your stop-loss just below the SAR value.
• In a short position, place your stop-loss just above the SAR value.

As the trend continues and the SAR moves closer to the price, your stop-loss also moves in the direction of the trade, helping to lock in profits while limiting downside risk. This method is known as a trailing stop and is especially useful in strong trending markets where the price doesn't reverse suddenly.

However, traders must be aware that in volatile markets, the SAR can get triggered prematurely, causing early exits from potentially profitable trades.

Combining Parabolic SAR with Other Indicators

Because the Parabolic SAR can generate false signals in non-trending environments, it's best used in conjunction with other technical tools. Here are some effective combinations:

• Moving Averages: Use a 200-period moving average to determine the overall trend. Only take SAR-generated signals that align with the trend.
• RSI (Relative Strength Index): Confirm SAR signals with RSI readings. For example, if the SAR flips to bullish but RSI is still in oversold territory, it strengthens the buy signal.
• Volume Indicators: High volume accompanying a SAR reversal can validate the strength of the new trend.

For instance, if the Parabolic SAR flips below the price and the RSI crosses above 50, this combination can serve as a strong buy signal. Conversely, if the SAR flips above the price and RSI crosses below 50, it may be a strong sell signal.

FAQ: Frequently Asked Questions About the Parabolic SAR

Q1: Can the Parabolic SAR be used in cryptocurrency trading?

Yes, the Parabolic SAR is commonly used in crypto markets, especially for identifying potential trend reversals in assets like Bitcoin and Ethereum. However, due to the high volatility of cryptocurrencies, it's advisable to use it with other indicators to avoid false signals.

Q2: Why does the Parabolic SAR sometimes give false signals?

The Parabolic SAR performs poorly in sideways or choppy markets. In such conditions, the indicator may flip frequently, creating false reversal signals. Traders should use additional tools like moving averages or volume indicators to confirm the trend.

Q3: What is the best setting for the Parabolic SAR?

The default setting is usually 0.02 for the acceleration factor and a maximum of 0.20. However, some traders adjust these values based on their trading style. Aggressive traders may use a higher acceleration factor, while conservative traders might lower it to reduce sensitivity.

Q4: Is the Parabolic SAR suitable for day trading?

Yes, the Parabolic SAR can be used for day trading, especially in strongly trending markets. However, due to its tendency to whipsaw in short timeframes, it's crucial to combine it with other confirmation tools such as candlestick patterns or momentum oscillators.