Speed Converter
Convert speed and velocity between km/h, mph, m/s, knots, Mach number, and 24+ units. Used in automotive, aviation, marine navigation, and athletics. See also our KPH to MPH and Knot to MPH converters.
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Popular Speed Converters:
What is a Speed Converter?
A speed converter is a tool that converts measurements between different units of speed and velocity such as kilometers per hour, miles per hour, meters per second, knots, and Mach. It is used in transportation, aviation, meteorology, and physics for comparing speeds across different systems.
How to Convert Speed Units
Select the speed unit you want to convert from and the unit you want to convert to using the dropdown menus. Enter your value in the input field and the converter will instantly calculate the equivalent speed. Use the popular conversion links below for common conversions like km/h to mph.
Speed Conversion Formulas
History of Speed Measurement
Speed measurement evolved alongside transportation. Ancient sailors measured ship speed using knots on a rope paid out over a fixed time, giving us the nautical knot. The Mach number, named after physicist Ernst Mach, was introduced in the early 20th century for speeds relative to sound. Today, m/s is the SI unit while km/h and mph dominate everyday use.
About This Speed Converter
This speed converter supports 24 different units including meter/second, kilometer/hour, mile/hour, knot, Mach number, foot/second, centimeter/second, yard/second, and various time-based combinations. It covers SI, imperial, and specialized aviation and maritime speed units.
Frequently Asked Questions
How do I convert km/h to mph?
Multiply kilometers per hour by 0.621371 to get miles per hour. For example, 100 km/h = 100 × 0.621371 = 62.14 mph.
What is Mach 1 in km/h?
Mach 1 is approximately 1,236 km/h (768 mph) at 20°C at sea level. The exact speed of sound varies with temperature and altitude.
How fast is a knot in mph?
One knot equals 1.15078 miles per hour or 1.852 kilometers per hour. Knots are used in aviation and maritime navigation.
How do I convert m/s to km/h?
Multiply meters per second by 3.6 to get kilometers per hour. For example, 10 m/s = 10 × 3.6 = 36 km/h.
What is the speed of light in km/h?
The speed of light is approximately 1,079,252,849 km/h (299,792.458 km/s). It is the fastest speed possible in the universe according to physics.
Metric Conversion Factor Tables for Speed Converter
| Units to convert | Multiply By The Number | Convert as Unit |
|---|---|---|
| Meter/second (m/s) | 3.6 | Kilometer/hour (km/h) |
| Meter/second (m/s) | 2.2369363 | Mile/hour (mph) |
| Meter/second (m/s) | 3.2808399 | Foot/second (ft/s) |
| Meter/second (m/s) | 1.9438445 | Knot (kt) |
| Kilometer/hour (km/h) | 0.6213712 | Mile/hour (mph) |
| Kilometer/hour (km/h) | 0.277778 | Meter/second (m/s) |
| Mile/hour (mph) | 1.609344 | Kilometer/hour (km/h) |
| Mile/hour (mph) | 0.44704 | Meter/second (m/s) |
| Mile/hour (mph) | 1.4666667 | Foot/second (ft/s) |
| Mile/hour (mph) | 0.8689762 | Knot (kt) |
| Knot (kt) | 1.852 | Kilometer/hour (km/h) |
| Knot (kt) | 1.1507794 | Mile/hour (mph) |
| Foot/second (ft/s) | 0.6818182 | Mile/hour (mph) |
| Foot/second (ft/s) | 1.09728 | Kilometer/hour (km/h) |
| Mach (20°C) | 1236.96 | Kilometer/hour (km/h) |
| Mach (20°C) | 343.6 | Meter/second (m/s) |
Speedconverters & it's abbreviations
| Unit | Abbreviation | Unit | Abbreviation | Unit | Abbreviation |
|---|---|---|---|---|---|
| meter/second | m/s | kilometer/hour | km/h kph | mile/hour | mph mi/h |
| foot/second | ft/s fps | knot | kt kn | Mach number | Ma |
| centimeter/second | cm/s | kilometer/second | km/s | mile/second | mi/s |
| yard/second | yd/s | meter/minute | m/min | kilometer/minute | km/min |
| mile/minute | mi/min | foot/minute | ft/min | yard/minute | yd/min |
| meter/hour | m/h | foot/hour | ft/h | centimeter/hour | cm/h |
| millimeter/second | mm/s | millimeter/minute | mm/min |
Complete list of Speed conversion units and its conversion.
- 1 kilometer/hour [km/h] = 0.6213711922 mile/hour [mph]
kph to mph → - 1 mile/hour [mph] = 1.609344 kilometer/hour [km/h]
mph to kph → - 1 meter/second [m/s] = 3.6 kilometer/hour [km/h]
m/s to km/h →
- 1 knot [kt] = 1.852 kilometer/hour [km/h]
knots to km/h → - 1 knot [kt] = 1.1507794 mile/hour [mph]
knot to mph → - 1 mile/hour [mph] = 0.8689762419 knot [kt]
mph to knot →
- 1 meter/second [m/s] = 3.2808398950 foot/second [ft/s]
m/s to ft/s → - 1 Mach (20°C, 1 atm) = 1236.96 kilometer/hour [km/h]
Mach to km/h → - 1 Mach (20°C, 1 atm) = 768.9036 mile/hour [mph]
Mach to mph →
- 1 meter/second [m/s] = 1.9438445 knot [kt]
m/s to knots → - 1 yard/second [yd/s] = 0.9144 meter/second [m/s]
yd/s to m/s → - 1 centimeter/second [cm/s] = 0.01 meter/second [m/s]
cm/s to m/s →
- 1 kilometer/hour [km/h] = 0.2777777778 meter/second [m/s]
km/h to m/s → - 1 meter/second [m/s] = 2.2369362921 mile/hour [mph]
m/s to mph → - 1 mile/hour [mph] = 0.44704 meter/second [m/s]
mph to m/s →
- 1 foot/second [ft/s] = 0.6818181818 mile/hour [mph]
fps to mph → - 1 mile/hour [mph] = 1.4666666667 foot/second [ft/s]
mph to fps → - 1 foot/second [ft/s] = 0.3048 meter/second [m/s]
ft/s to m/s →
- 1 kilometer/hour [km/h] = 0.5399568 knot [kt]
km/h to knots → - 1 kilometer/hour [km/h] = 0.9113444 foot/second [ft/s]
km/h to ft/s → - 1 mile/hour [mph] = 1609.344 meter/hour [m/h]
mph to m/h →
- 1 kilometer/second [km/s] = 3600 kilometer/hour [km/h]
km/s to km/h →