Speed Converter
Convert between units of speed and velocity instantly with precise reference factors.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
1 m/s = 3.599997 km/h
This tool provides general unit conversions for everyday and educational use. For regulated, legal, or scientific applications, verify conversion factors against the applicable official standard.
About the Speed Converter
The speed converter changes values between metres per second, kilometres per hour, miles per hour and knots. One knot is exactly one nautical mile (1,852 m) per hour and one mile is exactly 1,609.344 m, so all conversions use exact factors. It is useful for driving abroad, reading wind forecasts, and physics problems that need SI units.
How to use it
- 1Type the value you want to convert.
- 2Choose the unit you are converting from and the unit you want (for example km/h to mph).
- 3The result updates as you type; use the swap button to reverse the direction.
- 4Copy or share the result with the buttons below it.
Worked example
100 km/h ÷ 1.609344 ≈ 62.14 mph. A wind of 25 knots is 46.3 km/h, and 10 m/s is exactly 36 km/h.
How it works
How it works
Values are converted through a common base unit for accurate results.
Common use cases
- Converting speed limits when driving in another country
- Reading marine and aviation wind speeds in knots
- Converting physics answers to m/s
Frequently asked questions
A:Conversions use standard reference factors and display up to six significant digits.
A:Yes, use the swap button between the From and To selectors.
Reviewed for accuracy · Last updated October 7, 2026
Conversion factors are based on internationally defined SI units and standard metric/imperial equivalence tables.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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