Conversion hub
Speed & Velocity Converters
Convert between km/h, mph, m/s and knots. Instant speed converters with formulas, tables and worked examples.
About speed conversions
Speed is reported in km/h on most road signs, mph in the US and UK, m/s in physics, and knots in aviation and sailing. Converting between them matters for driving abroad, science homework and marine or flight planning.
The converters below handle every km/h, mph, m/s and knot pair with exact factors. Remember the most common pitfall: km/h and m/s differ by a factor of 3.6, not 1000.
Key formulas
km/h to mph
mph = km/h × 0.621371
mph to km/h
km/h = mph × 1.609344
m/s to km/h
km/h = m/s × 3.6
Knots to km/h
km/h = knots × 1.852
Popular speed conversions
Worked examples
- •100 km/h is about 62.1 mph.
- •10 m/s equals 36 km/h.
- •20 knots is about 37 km/h.
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Frequently asked questions
How do I convert speed units?
Pick the speed converter you need below, type a value, and the result appears instantly in your browser. Each pair uses the exact international factor — for example, km/h to mph: mph = km/h × 0.621371.
Which speed conversions are most common?
The most-used speed conversions are kmh to mph, mph to kmh, mps to kmh. Each has a dedicated page with a calculator, formula, conversion table and FAQs.
Are these speed converters accurate?
Yes. Every conversion uses standard international factors and precise floating-point math, suitable for everyday, academic and professional use.
Is my data sent to a server?
No. All conversions run locally in your browser on MerQPrime. Nothing you type is uploaded.