MPH to KM/H
km/h = mph × 1.609344
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Free Speed Converter
Speed Converter Convert MPH, KM/H, M/S & Knots
Convert miles per hour, kilometers per hour, meters per second, feet per second, knots and other speed units instantly.
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Metric Units
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Imperial Units
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Nautical Knots
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Instant Results
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Free Tool
Convert Speed Units
Enter a speed and choose your units
Popular Conversions
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Quick Reference
Common Speed Conversions
Useful reference values for metric, imperial and nautical speed measurements.
| From | Equals | Common Use |
|---|---|---|
| 1 mph | 1.609344 km/h | Road speed |
| 1 km/h | ≈ 0.621371 mph | Metric road speed |
| 1 m/s | 3.6 km/h | Science and engineering |
| 1 ft/s | 0.3048 m/s | Engineering |
| 1 knot | 1.852 km/h | Marine and aviation |
| 100 km/h | ≈ 62.1371 mph | Highway comparison |
Conversion Guide
Popular Speed Conversion Formulas
Common formulas used for driving, science, engineering, marine and aviation conversions.
KM/H to MPH
mph = km/h × 0.6213711922
M/S to KM/H
km/h = m/s × 3.6
KM/H to M/S
m/s = km/h ÷ 3.6
Knots to KM/H
km/h = knots × 1.852
FT/S to M/S
m/s = ft/s × 0.3048
Simple Process
How to Use the Speed Converter
Enter Speed
Type the numerical speed value you want to convert.
Select Units
Choose the original speed unit and your target speed unit.
View the Result
Get the converted speed, calculation and equivalent units.
Speed Conversion Guide
Free Online Speed Converter
Our free online speed converter helps you convert measurements between miles per hour, kilometers per hour, meters per second, feet per second, knots and other common speed units.
The tool is useful for driving, transportation, aviation, marine navigation, sports, science, engineering, education and everyday speed conversions.
What Is Speed Conversion?
Speed conversion is the process of expressing the same rate of motion in a different unit. For example, a vehicle speed measured in miles per hour can be converted into kilometers per hour without changing the actual rate of travel.
Different countries and industries use different speed units. Road signs may use kilometers per hour or miles per hour, scientific calculations often use meters per second, and marine or aviation applications commonly use knots.
Miles per Hour
Miles per hour, abbreviated as mph, expresses the number of miles traveled in one hour. It is commonly used for road speeds and vehicle speed measurements in countries that use miles.
Kilometers per Hour
Kilometers per hour, written as km/h, expresses the number of kilometers traveled in one hour. It is widely used for road traffic, vehicles, weather reports and transportation.
Meters per Second
Meters per second, written as m/s, is commonly used in science, physics and engineering. A speed of one meter per second means that an object travels one meter every second.
Feet per Second
Feet per second, abbreviated as ft/s, measures how many feet are traveled in one second. It is used in some engineering, motion and technical calculations.
Knots
A knot is a speed unit based on nautical miles per hour. Knots are commonly used in marine navigation, shipping, aviation and weather reporting.
How to Convert MPH to KM/H
Multiply the miles-per-hour value by 1.609344. For example, 60 mph equals 96.56064 km/h.
How to Convert KM/H to MPH
Multiply the kilometers-per-hour value by approximately 0.6213711922. For example, 100 km/h is approximately 62.1371 mph.
How to Convert M/S to KM/H
Multiply the meters-per-second value by 3.6. For example, 10 m/s equals 36 km/h.
How to Convert KM/H to M/S
Divide the kilometers-per-hour value by 3.6. For example, 72 km/h equals 20 m/s.
Common Uses of a Speed Converter
Speed converters are useful for road travel, international driving, vehicle comparisons, aviation, marine navigation, sports analysis, weather measurements, engineering, physics and education.
Important Speed Conversion Tip
Always check whether the source value is expressed per second, per minute or per hour. A correct distance unit with the wrong time unit can produce a very different result.
FAQ
Frequently Asked Questions
Multiply the speed in miles per hour
by 1.609344.
Multiply the speed in kilometers per hour
by approximately 0.6213711922.
One kilometer per hour equals approximately
0.2777777778 meters per second.
The converter supports meters per second,
kilometers per hour, miles per hour,
feet per second, knots, kilometers per second,
miles per second, centimeters per second
and meters per minute.
Yes. The speed converter is free
to use directly in your browser.