Parabolic SAR Calculator
Compute dynamic stop-and-reverse levels for trend following and stop-loss placement
Parabolic SAR Calculator
About This Calculator
The Parabolic SAR (Stop and Reverse) Calculator computes trailing stop levels that follow price in trending markets, created by J. Welles Wilder. The SAR dots appear below price in an uptrend and above price in a downtrend, automatically adjusting as the trend progresses.
How Parabolic SAR Works
- Acceleration Factor (AF): Starts at 0.02, increases by 0.02 each time a new extreme is reached
- Maximum AF: Capped at 0.20 (default) to prevent the SAR from catching up too fast
- Uptrend: SAR plots below price, rising with each new high
- Reversal: When price touches the SAR, trend is considered reversed
How to Use It
- Enter candle high and low prices (one pair per line as: high,low)
- Use SAR as a dynamic trailing stop-loss in trending markets
- Combine with trend confirmation — Parabolic SAR works poorly in sideways markets
- Common pairing: Parabolic SAR + MACD for trend confirmation