Speed Converter

Convert between mph, km/h, m/s, knots, and ft/s speed units with instant accurate results.

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1. Pick the speed unit you are starting with (mph, km/h, m/s, knots, or ft/s). 2. Type in the speed value you want to convert. 3. All equivalent speed values across the five supported units appear instantly. 4. Compare results side by side to understand the relationship between speed units. 5. Click copy on any result to use the converted speed value elsewhere.

About This Tool

The Speed Converter allows you to instantly convert between all common speed and velocity units. Whether you need to convert miles per hour to kilometers per hour for international travel, meters per second to km/h for physics problems, or knots to mph for marine weather, this tool delivers precise results in real time.

Our converter supports five widely used speed units: miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), knots (nautical miles per hour), and feet per second (ft/s). Each unit serves a specific purpose - km/h and mph for road speeds, m/s for scientific calculations, knots for aviation and sailing, and ft/s for ballistics and engineering.

Speed conversion is particularly important for international travelers, pilots, sailors, athletes, and scientists. Road speed limits vary by country and unit system, weather reports may use different scales, and scientific formulas typically require SI units (m/s). This converter eliminates the mental math and ensures accurate conversions every time.

Formula / How It Works

1 m/s = 3.6 km/h = 2.23694 mph = 1.94384 knots = 3.28084 ft/s

Frequently Asked Questions

To convert miles per hour to kilometers per hour, multiply by 1.60934. For example, 60 mph equals approximately 96.56 km/h. Conversely, to convert km/h to mph, divide by 1.60934 (or multiply by 0.621371).
A knot is one nautical mile per hour, used primarily in maritime and aviation. One knot equals approximately 1.15078 mph or 1.852 km/h. For example, a wind speed of 20 knots equals about 23.02 mph.
To convert m/s to km/h, multiply by 3.6. For example, 10 m/s equals 36 km/h. This is because there are 3,600 seconds in an hour and 1,000 meters in a kilometer (3600/1000 = 3.6).
The speed of sound at sea level in dry air at 20 degrees C is approximately 343 m/s, 1,235 km/h, 767 mph, 1,125 ft/s, or 667 knots. This is also known as Mach 1.

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