Calculate velocity and pace instantly with our free Speed Converters. Whether you are checking a car’s speed limit, calculating running pace, or measuring wind speed, these tools are fast and accurate.
Browse the list below to instantly convert between Metric units (Kilometers per Hour, Meters per Second) and Imperial/Nautical units (Miles per Hour, Knots).
Master Speed Converter
Speed & Velocity Conversion Directory
Professional conversion guides for automotive, aviation, maritime, and scientific speed measurements.
Road & Transport
- Miles per Hour to km/h
- km/h to Miles per Hour
- Miles per Hour to m/s
- km/h to Meters per second
- Feet per second to mph
- mph to Feet per second
Maritime & Aviation
- Knots to km/h
- Knots to Miles per Hour
- Knots to Meters per second
- Mach to Miles per Hour
- Mach to km/h
- mph to Knots
Scientific & High Speed
- Meters per second to km/h
- Kilometers per second to km/h
- Meters per second to mph
- Speed of Light to km/h
- Mach to Meters per second
- Feet per second to m/s
Small Scale Velocity
- Millimeters per second to m/s
- Centimeters per second to m/s
- Inches per second to mph
- Feet per minute to fps
- Yards per second to mph
- km/min to km/h
Frequently Asked Questions
The speed of sound (Mach 1) changes based on the medium and temperature. In aviation, Mach 1 is usually calculated at sea level at 20°C (343 m/s), but it decreases as an aircraft climbs into colder, thinner air.
A simple trick is to divide the km/h value by 3.6. For example, 36 km/h divided by 3.6 equals exactly 10 meters per second.
The Knot (kn) is the standard unit of speed for professional meteorology, and for maritime and air navigation. It is based on the Earth’s coordinates (one nautical mile per hour).
In a vacuum, the speed of light is a fundamental physical constant ($c$) exactly equal to 299,792,458 meters per second (approx. 1.08 billion km/h).