Parabolic SAR
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
AI Quick Summary: Parabolic SAR Summary
Term
Parabolic SAR
Category
Trading
Definition
Parabolic SAR (Stop and Reverse) is a trend-following indicator that plots dots above or below price.
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Parabolic SAR (Stop and Reverse) is a trend-following indicator that plots dots above or below price. Dots below price = uptrend; dots above price = downtrend. When price crosses through the dots, it signals a potential trend reversal and a suggested stop-loss level.
Parabolic SAR was developed by J. Welles Wilder Jr. (the same creator as RSI). "SAR" stands for Stop and Reverse — the indicator acts both as a trailing stop-loss mechanism and a trend direction signal.
**How it works:** - In an uptrend: dots appear below price and move up over time, accelerating as the trend strengthens - In a downtrend: dots appear above price and move down - When price crosses through the SAR dots, the indicator flips to the other side - The acceleration factor (AF) typically starts at 0.02 and increases by 0.02 each period the trend continues, up to a maximum of 0.20
**Key settings:** - **Step/AF (0.02 default)**: How quickly the SAR accelerates; higher values react faster but produce more false signals - **Maximum AF (0.20 default)**: Caps the acceleration
**Strengths:** - Excellent for trailing stops in trending markets - Clear, objective signals (no subjectivity) - Provides built-in stop placement
**Weaknesses:** - Very poor in sideways/ranging markets (produces constant false signals) - Lags significantly when a new trend begins - Not suitable as a standalone system
**Crypto application:** Parabolic SAR is best used in strongly trending crypto markets. During Bitcoin bull runs, it provides good trailing stop guidance. During Bitcoin's sideways accumulation phases, it generates excessive false reversals and should be filtered by trend confirmation.
Frequently Asked Questions
How do you use Parabolic SAR for stop losses?
In an uptrend, the SAR dot below price represents a trailing stop level. As price rises and the SAR moves up, you raise your stop accordingly. When price closes below the SAR dot, exit your long position (the SAR 'reverses'). This prevents giving back large profits during trend reversals.
Why does Parabolic SAR fail in ranging markets?
In sideways markets, price oscillates above and below the SAR constantly, generating frequent false reversal signals. This causes whipsaw trading with small losses that add up quickly. Only use Parabolic SAR when the market is in a clear directional trend, confirmed by a trend filter like the 200 EMA.
What Parabolic SAR settings work best for crypto?
For crypto's higher volatility, some traders increase the step to 0.03 and maximum to 0.30 to prevent the SAR from being too sensitive. Others use slower settings (0.01 step, 0.1 max) for swing trading to allow more room. Test settings on historical data for the specific asset and timeframe.
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Related Terms
Moving Averages (SMA & EMA)
A moving average smooths price data by creating a constantly updated average price over a specified period. The Simple Moving Average (SMA) weighs all periods equally; the Exponential Moving Average (EMA) gives more weight to recent prices, making it more responsive to current market conditions.
Average True Range (ATR)
Average True Range (ATR) is a volatility indicator that measures the average range of price movement over a specified period, accounting for gaps. Traders use ATR to set dynamic stop losses, determine position sizes, and assess whether current volatility is above or below normal levels for an asset.
RSI (Relative Strength Index)
The RSI (Relative Strength Index) is a momentum oscillator that measures the speed and magnitude of recent price changes on a scale of 0–100. Readings above 70 suggest an asset may be overbought, while readings below 30 suggest it may be oversold.
Trend Lines
Trend lines are diagonal lines drawn on a chart connecting two or more price points to define the current direction of price movement. An uptrend line connects higher lows; a downtrend line connects lower highs. Breaks of trend lines signal potential trend reversals.
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