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Calculate Fibonacci retracement & extension levels.
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Fibonacci Calculator is a free, browser-based tool built for one job: calculate fibonacci retracement & extension levels. It is part of ToolsMonk's business tools collection, so you can finish the work 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.
Everything about Fibonacci Calculator is tuned for speed to first result, with privacy-friendly processing and the rest of ToolsMonk's tools nearby when the next task comes up.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Business Tools |
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 and no limit on calculations
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 free online tool on ToolsMonk with a single focus: calculate fibonacci retracement & extension levels. Whether you're a professional, student, or casual user, it provides instant, accurate results right in your browser without requiring any software installation or account creation.
Privacy and portability drive the design: all processing runs locally in your browser, so your files and data never leave your device. It behaves identically in every modern browser, from a desktop workstation to a phone.
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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