Parabolic SAR

The Parabolic Stop and Reverse (SAR), another creation of J. Welles Wilder, is a trend-following indicator that provides potential entry and exit points through a series of dots placed above or below the price. Its name comes from the parabolic shape these dots trace as the trend accelerates.

The calculation uses an acceleration factor that starts at 0.02 and increases by 0.02 each time a new extreme point (highest high in an uptrend, lowest low in a downtrend) is reached, capping at 0.20. This acceleration mechanism causes the dots to move closer to price as the trend matures, eventually catching up and triggering a reversal signal. It's this self-tightening feature that makes Parabolic SAR unique among trend indicators.

When the dots are below price, the market is in an uptrend. When they flip to above price, it signals a downtrend. Each flip is both an exit signal for the previous position and an entry signal for a new one in the opposite direction — hence "stop and reverse." This means Parabolic SAR always has you in the market, either long or short. In practice, many traders use it only as an exit/trailing stop and apply separate criteria for entries.

The indicator shines in trending markets with sustained moves. During EUR/USD trends on the H4 or daily timeframe, Parabolic SAR can keep you in a trade for days or weeks while gradually tightening your stop. The acceleration factor ensures you capture most of the move: early in the trend, the dots trail loosely to allow room; later, they close in quickly to lock profits.

The weakness is obvious in ranging markets. When price moves sideways, the dots flip frequently, generating a series of small losing trades that erode capital. This is why combining Parabolic SAR with a trend-strength indicator like ADX (also by Wilder) is so popular. Only follow SAR signals when ADX is above 25, confirming a genuine trend is in place.

You can adjust the step (starting acceleration) and maximum values to suit your trading style. Increasing the step (e.g., 0.03) makes the indicator more sensitive — quicker reversals but more false signals. Decreasing it (e.g., 0.01) creates a smoother, slower indicator that stays in trends longer but exits later.

Combine Parabolic SAR with ADX for a filtered trend system. Only take SAR buy signals when ADX is above 25 and +DI is above -DI. Only take sell signals when ADX is above 25 and -DI is above +DI. When ADX is below 20, stay flat regardless of SAR signals. This simple filter eliminates most of the whipsaw losses that plague pure SAR trading in choppy markets.

For a trailing stop approach, enter trades using any strategy you prefer (breakout, pullback, etc.) and use SAR purely as your exit mechanism. Set SAR with a slower acceleration factor (0.01 instead of 0.02) for swing trades on H4/Daily charts. This wider setting gives the trade more room to breathe while still locking in profits as the SAR dots gradually approach price.

The SAR reversal strategy works on the daily chart for strong trending markets. When SAR flips from above to below price after at least 5 consecutive dots above price, enter long with a target of the previous swing high. Require 5+ dots because this ensures the preceding downtrend was established, making the reversal more significant than a quick flip.