FATL: Fast Adaptive Trend Line Indicator
Info
The FATL: Fast Adaptive Trend Line Indicator is a Indicator for MetaTrader 5 that fatl (fast adaptive trend line) is calculated using a low-frequency digital filter (flf-1). The FLF-1 filter is used for high-frequency noise suppression and reduction of market cycles with very short volatility periods, which can be considered noise.
Usage
This tool is typically used for trend following strategies across multiple currency pairs.
Platform
This Indicator works exclusively on MetaTrader 5 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL5/Indicators folder via File ? Open Data Folder in MetaTrader 5.
How to Install and Use FATL: Fast Adaptive Trend Line Indicator
1. Installation: Place your file in the MQL/Indicators folder via "Open Data Folder" and restart your terminal.
2. Loading: Find the indicator in the Navigator, drag it onto your chart, and configure the input parameters in the popup window.
3. Customization: Press Ctrl+I to open the indicator list, select your tool, and click "Properties" to change colors, levels, or visual styles.
4. Updating: Replace the old file in the Indicators folder with the new version and restart the platform to apply changes.
Frequently Asked Questions
Q: Why is my indicator not showing? A: Verify the file is in the MQL/Indicators folder, or try right-clicking the "Indicators" tree in the Navigator and clicking "Refresh."
Q: Do custom indicators slow down the platform? A: Too many complex indicators can impact performance; remove unused ones via the "Indicator List" (Ctrl+I).
Q: Can I use MT4 indicators on MT5? A: No, MQL4 and MQL5 are distinct languages; ensure the indicator is compiled specifically for your platform version.
What this tool does
FATL (Fast Adaptive Trend Line) is calculated using a low-frequency digital filter (FLF-1).
Typical Use Case
This Indicator excels in trend following on MetaTrader 5.
Compatible Platform & Setup
This Indicator works on MetaTrader 5. Place the file in the MQL5/Indicators folder and restart the terminal.
Description & Settings
Related: Fast Trend Line Momentum and Slow Trend Line Momentum Indicators - another powerful indicator for MetaTrader 5 traders.
FATL (Fast Adaptive Trend Line) is calculated using a low-frequency digital filter (FLF-1).Also recommended: Reference Fast Trend Line - similar indicator with strong performance on MetaTrader 5.
The FLF-1 filter is used for high-frequency noise suppression and reduction of market cycles with very short volatility periods, which can be considered noise.The filter parameters (FC cutoff frequency and attenuation at the rejection band) were calculated using EUR/USD exchange rate spectral estimation.
The low-frequency filters FLF-1 and FLF-2 provide attenuation in the stop band of no less than 40 dB and do not distort the amplitude and phase of entry discontinuous price series in the pass band.
These digital filter properties provide significantly improved noise suppression compared to simple moving averages. This, in turn, sharply reduces the probability of false buy and sell signals.
There are no widely known technical instruments that are analogues to FATL.
It is not a moving average, but an adaptive line estimate of short-term trends.
Unlike moving averages, FATL has no phase delay with regard to current prices.
This indicator is suitable for MT4 and MT5 platforms and was last updated in 2026.
You may also like: Fast Zig Zag - excellent alternative for indicator users on MetaTrader 5.
Source Code
#property copyright "robotfx"
#property link "https://robotfx.org"
#property version "1.00"
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots 1
#property indicator_type1 draw_line
#property indicator_color1 blue
#property indicator_style1 style_solid
#property indicator_width1 2.......
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.