Online Fibonacci Calculator Tool – Calculate A, B, C Levels + Formula
The TradingFinder Fibonacci Calculator is a free, powerful online tool that helps traders identify 8 retracement levels and 9 extension levels in both uptrends and downtrends. By entering three key values—High, Low, and Custom—traders can quickly generate Fibonacci levels for precise market analysis across any timeframe or trading style.
What Is the TradingFinder Fibonacci Calculator?
This tool calculates Fibonacci retracement and extension levels based on three price points:
- High
- Low
- Custom Point (used for extension calculations)
Whether you're trading Forex, Crypto, or Stocks, this calculator adapts to any chart—from 1-second scalping to 12-month swing trading. It's ideal for short-term, medium-term, and long-term strategies.
⚙️ How to Use the Fibonacci Calculator
✅ For an Uptrend:
- Enter the High price in the designated field
- Input the Low price (must be less than the High)
- Set a Custom level (for extension calculations)
- Click Calculate
➡️ The calculator then displays Fibonacci retracement levels (potential support zones) and extension levels (potential resistance zones) on the right.
✅ For a Downtrend:
- Scroll to the Downtrend section below the uptrend form
- Repeat the same steps—enter High, Low, and Custom, then click Calculate
➡️ In this case, retracement levels act as resistance, and extension levels serve as support.
Understanding the Output
- Uptrend:
- Retracement Levels = Possible support zones
- Extension Levels = Possible resistance zones
- Downtrend:
- Retracement Levels = Potential resistance
- Extension Levels = Potential support
This distinction helps traders recognize trend continuation or potential reversals with accuracy.
Fibonacci Formula
The core of the tool is based on the Fibonacci sequence:
Fn=Fn−1+Fn−2F_n = F_{n-1} + F_{n-2}
This sequence leads to common Fibonacci ratios such as 23.6%, 38.2%, 50%, 61.8%, 78.6%, 100%, 161.8%, and more—widely used for price projection and target setting.
Why Use TradingFinder’s Fibonacci Calculator?
- Instantly identify support and resistance zones
- Set accurate entry and exit points
- Define price targets using Fibonacci-based projections
- Apply it across any asset and any timeframe
- Works with all trading styles, from scalping to investing