Speed Converter
Convert between m/s, km/h, mph, knots, and ft/s.
About Speed Conversion
Conversions are based on exact unit factors (e.g., 1 mph = 1.609344 km/h) and computed entirely in your browser.
About this Speed Converter
Convert between speed units: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots, and feet per second (ft/s). Whether you are comparing driving speeds in different countries, working with aviation or marine speeds in knots, or doing physics or weather calculations, this tool gives you instant, accurate conversions. Enter a value and choose source and target units; the result updates as you type. All calculations run in your browser with no data sent to servers. Useful for travel, sports, science, and everyday conversions.
Key Features
Support for m/s, km/h, mph, knots, and ft/s
Instant conversion as you type
Bidirectional: convert from any unit to any other
Clear result with optional copy to clipboard
Standard conversion factors used for accuracy
Runs entirely in your browser; no account needed
How to Use
Enter the speed value you know
Select the unit of that value (e.g., mph, km/h)
Select the unit you want to convert to
View the converted result
Popular Use Cases
Driving: convert speed limits or trip speeds between mph and km/h when traveling
Aviation and marine: convert knots to km/h or mph for reporting or planning
Weather: work with wind speeds in m/s, km/h, or mph
Sports: convert running or cycling speeds between units
Tips & Best Practices
1 mph ≈ 1.609 km/h. For a rough mental conversion, multiply mph by 1.6 to get km/h.
Knots are nautical miles per hour; 1 knot ≈ 1.151 mph.
m/s is common in physics and weather; multiply by 3.6 to get km/h.
Frequently Asked Questions
How do I convert mph to km/h?
Multiply by 1.609. Or use this tool: enter the speed in mph and select km/h as the target unit.
What are knots?
Knots are nautical miles per hour, used in aviation and maritime. 1 knot ≈ 1.151 mph ≈ 1.852 km/h.
Are the conversions accurate?
Yes. Standard conversion factors are used. For critical applications (e.g., aviation), always verify with official sources.
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