Convert Mph to Kph

Speed Converter

Easily convert between Kilometers per Hour (km/h), Miles per Hour (mph), Meters per Second (m/s), Feet per Second (ft/s), Knots (kt), and Mach. Whether you're measuring car speed, aircraft velocity, or physics experiment values, this tool gives you fast and accurate conversions.

Why Use It?

• Ideal for travel, sports timing, aeronautics, and scientific calculations.
• Converts between metric and imperial speed units.
• Accurate to four decimal places.
• Great for students, pilots, athletes, and engineers alike.

Popular Conversions

• Kilometers per Hour to Miles per Hour
• Miles per Hour to Kilometers per Hour
• Meters per Second to Feet per Second
• Feet per Second to Meters per Second
• Knots to Miles per Hour
• Miles per Hour to Knots

Common Speed Units and Their Uses

• 

  Kilometers per Hour (km/h)

  Common for road speeds worldwide.

• 

  Miles per Hour (mph)

  Used in U.S./UK for road speeds.

• 

  Meters per Second (m/s)

  SI unit, science and engineering.

• 

  Feet per Second (ft/s)

  Used in ballistics and physics.

• 

  Knots (kt)

  Maritime and aviation speed.

• 

  Mach

  Relative to speed of sound.

Real-World Use Cases for Speed Conversion

• 

  Travel

  Convert car or bike speeds while abroad.

• 

  Aviation & Marine

  Standardize speeds in navigation and transportation.

• 

  Athletics

  Analyze race speeds and training performance.

• 

  Physics & Engineering

  Solve speed-related problems in technical fields.

• 

  Aerospace

  Calculate and compare speeds near the sound barrier.

Frequently Asked Questions

What is Mach speed?

Mach is a ratio comparing an object's speed to the speed of sound in air. Mach 1 equals the speed of sound (approx. 343 m/s or 1,235 km/h) at sea level under standard atmospheric conditions.

How many mph is 100 km/h?

100 kilometers per hour is approximately 62.1371 miles per hour.

Why do airplanes use knots instead of km/h or mph?

Knots are based on nautical miles, which relate closely to lines of latitude and longitude. This makes them especially useful for navigation over the Earth's curved surface.

Are m/s and km/h interchangeable?

They measure the same quantity (speed), but 1 m/s = 3.6 km/h. So, they are not numerically equivalent and require conversion.