Speed Converter
Convert km/h, mph, m/s, knots and Mach.
Speed Converter
Universal unit converter engine
What does Speed Converter do?
Convert between seven speed units including knots for marine and air navigation and Mach for aviation. Pace conversion is included for runners, turning speed into minutes per kilometre or mile.
How to Use Speed Converter
- 1Enter a speedAny value.
- 2Choose the unitsFrom and to.
- 3Read the resultPlus pace for runners.
Key Features
- Seven units including knots, Mach and the speed of light
- Running pace in minutes per kilometre and per mile
- Common speed limits shown for reference
- Exact factor: 1 mph = 0.44704 m/s
- Mach clearly labelled as sea level at 20 °C, since it varies with conditions
Frequently Asked Questions
How do I convert km/h to mph?
Divide by 1.609344. 100 km/h is 62.14 mph. For a rough estimate, multiply by 0.6 — close enough to read a speedometer.
What is a knot?
One nautical mile per hour, which is 1.852 km/h or 1.151 mph. It is used at sea and in aviation because a nautical mile is one minute of latitude, which makes chart navigation straightforward.
Is Mach a fixed speed?
No. Mach 1 is the local speed of sound, which depends on air temperature. At sea level and 20 °C it is about 343 m/s, but at cruising altitude it drops to roughly 295 m/s. The listed value states its conditions.
How does pace relate to speed?
Pace is the inverse — minutes per unit distance rather than distance per hour. Running 12 km/h is a 5:00 min/km pace. Runners use pace because it maps directly onto a target finish time.
Conversions run in your browser using fixed, published factors. Nothing you enter is transmitted, and the tool keeps working with the network disconnected.
Related Tools
Unit Converter
Convert length, weight, temperature, volume, speed and more.
Length Converter
Convert metres, feet, inches, miles, kilometres and more.
KM to Miles Converter
Convert kilometres to miles for distance and speed.
Miles to KM Converter
Convert miles to kilometres for distance and speed.