Speed Converter
Example: 60 mph = 96.6 km/h = 52.1 knots
Convert between speed units, including miles per hour to kilometers per hour and knots to mph. The converter can be used for driving, aviation, marine navigation, and physics calculations.
Result
Miles per Hour
Kilometers per Hour
Knots
Meters per Second
How We Calculate This
All conversions use meters per second as the base unit. 1 mph = 0.44704 m/s, 1 km/h = 0.27778 m/s, 1 knot = 0.51444 m/s, 1 ft/s = 0.3048 m/s, Mach 1 = 343 m/s.
Methodology last reviewed: October 2025. How SparkCalc works
Sources: BIPM: The International System of Units (SI Brochure) · NIST: Special Publication 330: The International System of Units (SI) · NIST: Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically
Frequently Asked Questions
How do I convert mph to km/h?
Multiply mph by 1.609 to get km/h. For example, 60 mph = 60 × 1.609 = 96.6 km/h. To convert km/h to mph, divide by 1.609.
What is a knot?
1 knot equals 1 nautical mile per hour, which is 1.852 km/h or 1.151 mph. Knots are used in maritime and aviation navigation.
What is Mach speed?
Mach 1 is the speed of sound, approximately 343 m/s or 767 mph at sea level. Mach 2 is twice the speed of sound, etc. The exact value varies with temperature and altitude.
How fast is the speed of light?
The speed of light is approximately 299,792,458 m/s or about 671 million mph. This is often denoted as "c" in physics.
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