Speed Unit Converter

WHAT IT DOES

Speed Unit Converter transforms speeds between five common units: kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), knots (kn), and feet per second (ft/s). Enter a speed in any unit and see the converted result instantly. The tool displays both the input and output values with their unit labels, and optionally shows a comparison with the unit names for context. You can swap the input and output units with one click, adjust the decimal precision (0-10 places), and copy the result to your clipboard. The auto-convert feature updates results as you type.

WHERE IT RUNS

The extension runs entirely within your browser's local environment using the BotGentz framework. All speed conversion, unit calculation, and formatting occur on your machine without any network requests. No speed data, conversion results, or user activity is ever transmitted, uploaded, or stored externally. The tool works on any website and respects the browser's security boundaries, operating within the isolated extension sandbox. Speed conversion uses standard conversion factors.

HOW TO USE

Click the extension toolbar icon to open the Speed Unit Converter panel. Enter a speed value in the input field. Select the "From" unit (km/h, mph, m/s, knots, or ft/s) and the "To" unit. The conversion result appears instantly if auto-convert is enabled. Click "Convert" to manually trigger a conversion. Click "Swap Units" to exchange the from and to units. Click "Copy Result" to copy the conversion result to your clipboard. Toggle "Auto convert" to enable or disable real-time conversion. Toggle "Show comparison" to display the unit names alongside the values. Toggle "Swap default direction" to control whether the default from/to direction is swapped. Adjust the "Decimal places" (0-10) to control the precision of the result. The tool updates automatically when you change settings.

THE SPEED CONVERSION ENGINE — WHY IT WORKS

Most speed converters use hard-coded formulas for each conversion pair, leading to code duplication. This tool uses a factor-based conversion engine where each unit has a factor relative to km/h. The conversion formula is: result = value * (toFactor / fromFactor). This means the engine converts from any unit to any other unit using the same simple calculation, regardless of the direction. The five supported units have the following factors: km/h = 1, mph = 0.621371, m/s = 0.277778, knots = 0.539957, ft/s = 0.911344. The comparison display shows the input and output values with their full unit names for context. The precision control uses Number.toFixed() for consistent rounding. This factor-based approach ensures accuracy, consistency, and easy maintainability.

THE PANEL

The Speed Unit Converter panel is fully draggable by its title bar and remembers its position on screen per website. It snaps to the edges of your browser window for clean alignment. Collapse the panel to a compact icon strip using the minimize button, restoring it with a single click. Resize the panel by dragging any edge or corner; the input area, unit selectors, and result display adjust proportionally. Press the Escape key to close the panel instantly. The panel maintains independent state for each browser tab, allowing you to convert speeds in multiple tabs simultaneously.

PLEASE NOTE

This extension requires the free BotGentz extension framework to be installed and enabled. The tool supports five common speed units; additional units are not currently supported. The auto-convert feature triggers on every input event; disabling it can improve performance on slower devices. The comparison display is optional and can be toggled on or off. All conversion data is processed locally and is never transmitted, logged, or shared. The extension requests no network permissions and functions entirely offline. The source code is fully auditable and available for review.