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Free Speed Converter

Convert speeds between Miles per Hour (MPH), Kilometers per Hour (KPH), Knots, Meters per Second, and Mach numbers instantly. Perfect for aviation, automotive, and general use.

Last Updated: 15 Jan 2026

Enter Speed

Unit

KPH

96.56Kilometers per Hour

m/s

26.82Meters per Second

Knots

52.14Nautical Miles per Hour

Mach

0.078Speed of Sound

Understanding Speed Measurements

MPH vs KPH

MPH (Miles per Hour): Standard in the USA and UK. Based on statute miles (5,280 feet).

KPH (Kilometers per Hour): Standard in most other countries. Based on metric kilometers (1,000 meters).

1 MPH ≈ 1.609 KPH

Knots & Mach

Knots: Used in aviation and maritime. 1 Knot = 1 Nautical Mile/hr (6,076 feet). Based on Earth's latitude.

Mach: Speed relative to the speed of sound. Mach 1 ≈ 767 MPH (at sea level). Varies with altitude and temperature.

Common Speeds Reference

Speed Reference	MPH	KPH	Knots	Mach
Average Walking Speed	3.1	5.0	2.7	0.004
Usain Bolt's Top Speed	27.8	44.7	24.2	0.036
Highway Speed Limit (Typical)	65	105	56.5	0.085
Commercial Jet Cruise	575	925	500	0.78
Speed of Sound (Mach 1)	767	1,235	667	1.0

Aviation Speeds

Subsonic: Below Mach 0.8 (commercial jets)
Transonic: Mach 0.8-1.2 (approaching sound barrier)
Supersonic: Above Mach 1 (faster than sound)
Hypersonic: Above Mach 5 (extreme speeds)

Automotive Speeds

City Driving: 25-35 MPH / 40-56 KPH
Highway: 55-75 MPH / 88-121 KPH
Racing: 150+ MPH / 241+ KPH
World Record: 763 MPH / 1,228 KPH (ThrustSSC)

Speed Conversion Formulas

Basic Conversions

MPH to KPH: × 1.609344
KPH to MPH: ÷ 1.609344
MPH to Knots: ÷ 1.15078
Knots to MPH: × 1.15078

Mach Conversions

Mach 1 ≈ 767 MPH (sea level)
Mach 1 ≈ 1,235 KPH (sea level)
Mach 1 ≈ 667 Knots (sea level)
Varies with altitude & temperature

Frequently Asked Questions

How do I convert MPH to KPH?

To convert Miles per Hour to Kilometers per Hour, multiply MPH by 1.609344. Formula: KPH = MPH × 1.609344. For example, 60 MPH = 96.56 KPH. Our converter does this automatically and shows all conversions simultaneously.

What is Mach speed?

Mach is a unit of speed relative to the speed of sound. Mach 1 equals the speed of sound (approximately 767 MPH or 1235 KPH at sea level). Mach numbers are commonly used in aviation to describe aircraft speeds. Mach 2 is twice the speed of sound, Mach 0.5 is half the speed of sound.

What are knots used for?

Knots measure speed in nautical miles per hour. One knot equals one nautical mile per hour (1.151 MPH or 1.852 KPH). Knots are standard in aviation and maritime navigation because they're based on nautical miles, which account for the Earth's curvature.

What's the difference between MPH and KPH?

MPH (Miles per Hour) is used primarily in the United States and UK, measuring speed in statute miles per hour. KPH (Kilometers per Hour) is used in most other countries, measuring speed in kilometers per hour. 1 MPH = 1.609344 KPH. Both measure the same thing (distance per time) but use different distance units.

How fast is the speed of sound?

The speed of sound (Mach 1) varies with altitude and temperature. At sea level at 15°C (59°F), it's approximately 767 MPH, 1,235 KPH, 661 knots, or 343 meters per second. At higher altitudes where it's colder, sound travels slower.

Is this speed converter accurate?

Yes, our speed converter uses precise conversion formulas and provides accurate results. All conversions follow standard conversion factors used in aviation, automotive, and scientific applications. Results are accurate to multiple decimal places.