mph to km/h Converter
Convert speed and velocity units instantly with this free mph to km/h converter.
Features bidirectional conversion, reference tables, and applications for travel, sports, and science.
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Frequently Asked Questions
Common questions about the mph to km/h Converter
Multiply by 1.609. 60 mph = 96.6 kph. Quick estimate: add 60% to mph for kph.
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Sources & References
International System of Units (SI): speed and velocity
Speed and velocity is measured in the metre per second (m/s); 1 mph = 0.44704 m/s. Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
International System of Units (SI)
Authoritative definitions for speed and velocity, from the BIPM SI Brochure (9th edition), the defining reference for the SI.