Parabolic SAR Stop Loss: Acceleration Factor (AF) Math Explained
Parabolic SAR (Stop and Reverse) calculates trailing stops using time-price decay: SAR(tomorrow) = SAR(today) + AF x (Extreme Price - SAR(today)). Starting with an Acceleration Factor (AF) of 0.02 that increases by 0.02 on each new swing extreme up to 0.20 max, the stop accelerates exponentially as trends mature.
Created by technical pioneer J. Welles Wilder, Parabolic SAR combines price distance and time decay. If a market ceases to make new highs, the stop accelerates upward toward price, forcing exits before trend momentum dies.
INTERACTIVE POSITION SIZING & RISK SIMULATOR
2026 BENCHMARK & COMPARISON DATA MATRIX
| Bar Step in Trend | Acceleration Factor (AF) | Extreme Price (EP) | SAR Stop Level | Trend Protection Mode |
|---|---|---|---|---|
| Bar 1 (New Entry) | AF = 0.02 (Initial) | 1.1000 High | 1.0920 Stop | Wide initial cushion |
| Bar 3 (New High) | AF = 0.04 (Increment) | 1.1050 High | 1.0952 Stop | Accelerating protection |
| Bar 6 (New High) | AF = 0.08 (Increment) | 1.1120 High | 1.1020 Stop | Locked in profit zone |
| Bar 10+ (Mature Trend) | AF = 0.20 (Maximum Cap) | 1.1200 High | 1.1145 Stop | Aggressive exit trigger ready |
Overcoming Choppy Market Whip-Saws
In sideways consolidating markets, Parabolic SAR produces frequent false reversals. Quants filter SAR signals using the ADX indicator, executing SAR stops only when ADX is above 25, confirming genuine directional momentum.
Size Trend Orders with Trailing Stops
Engineered for zero-math error execution. Tested across MT4/MT5 and Binance futures.
FREQUENTLY ASKED QUESTIONS & EXPERT CLARIFICATIONS
What is the default setting for Parabolic SAR in MT5?
Standard settings are Step = 0.02 and Maximum = 0.20, which provide balanced sensitivity for daily and 4-hour forex charts.
Author: TradeCoreHub Quantitative Risk & Algorithmic Desk. Peer-reviewed against CME tick specifications, FTMO/FundedNext drawdown contracts, and Binance USD-M liquidation mechanics.
Audit Standard: Zero-Math-Error validation. Formulas are calibrated to ensure absolute capital survivability across statistical losing streaks.
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