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Calculate Fibonacci retracement & extension levels.
Fibonacci Calculator is a free browser-based tool that helps you calculate fibonacci retracement & extension levels. It is part of ToolsMonk's stock market tools collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as finding potential support/resistance levels for a stock or forex move, planning entries, targets, and stops around fibonacci levels, and identifying retracement zones during a pullback. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Fibonacci Calculator is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.
Enter the swing high and swing low of the price move
Indicate the trend direction (up or down)
The tool calculates the retracement and extension levels
Use the levels as reference zones in your analysis
Calculates Fibonacci retracement and extension levels from a price swing
Takes a swing high and swing low to derive key levels
Outputs the common ratios (23.6%, 38.2%, 50%, 61.8%, 78.6%, and extensions)
A quick reference for technical analysis and trade planning
Runs in your browser — your figures stay on your device
Free, with no signup
Finding potential support/resistance levels for a stock or forex move
Planning entries, targets, and stops around Fibonacci levels
Identifying retracement zones during a pullback
Projecting extension targets beyond a prior swing
Fibonacci Calculator is a powerful free online tool available on ToolsMonk that helps you calculate fibonacci retracement & extension levels. Whether you're a professional, student, or casual user, our fibonacci calculator provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our Stock Market Tools collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
Fibonacci Calculator derives retracement and extension levels from a price swing, giving traders a quick reference for the ratios — 23.6%, 38.2%, 50%, 61.8%, 78.6%, and extensions like 161.8% — widely used in technical analysis.
Retracement levels, drawn between a swing high and low, mark price areas where a pullback might pause or reverse, with the 61.8% 'golden ratio' the most closely watched. Part of their influence is self-fulfilling: because so many traders act around these levels, orders cluster there and reactions can reinforce themselves.
The crucial caveat is that these are reference zones, not predictions. Price is under no obligation to respect any Fibonacci level, and the technique works best as one input alongside trend, volume, and traditional support/resistance — not as a standalone signal. The output is an analysis aid, not trading advice.
Extension levels project beyond the original move to estimate targets if the trend continues. Accurate levels depend on choosing clear, significant swing points as anchors. Everything runs in your browser, so your figures stay private. Pair it with the other ToolsMonk stock and trading calculators for fuller analysis.
Use Fibonacci levels as zones of interest confirmed by other signals — never as a standalone buy/sell trigger
Watch the 61.8% level closely on pullbacks; it's the most-respected retracement among traders
Pick clear, significant swing highs and lows — sloppy anchor points produce meaningless levels
Common questions about this tool, its workflow, and what to expect before you use it.
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