Question 1

How do I convert mph to km/h?

Accepted Answer

To convert miles per hour to kilometers per hour, multiply by 1.60934. For example, 60 mph = 60 × 1.60934 = 96.56 km/h. Our converter does this calculation automatically and instantly - just enter your mph value. This is essential for international travelers and understanding speed limits in different countries.

Question 2

How do I convert km/h to m/s?

Accepted Answer

To convert kilometers per hour to meters per second, divide by 3.6. For example, 100 km/h = 100 ÷ 3.6 = 27.78 m/s. Simply enter your value in the km/h field for instant conversion. Meters per second is commonly used in physics and scientific calculations.

Question 3

What is the speed limit conversion between mph and km/h?

Accepted Answer

Common speed limit conversions: 20 mph = 32 km/h (school zone), 30 mph = 48 km/h (residential), 50 mph = 80 km/h (main roads), 60 mph = 97 km/h (rural), 70 mph = 113 km/h (highway). Use the converter to get precise values for any speed limit when traveling internationally.

Question 4

What are knots used for?

Accepted Answer

Knots (nautical miles per hour) are primarily used in maritime and aviation contexts. 1 knot = 1.852 km/h or 1.151 mph. Ships and aircraft often display their speed in knots because it relates directly to navigation on charts. Wind speeds are also commonly measured in knots.

Question 5

How fast is the speed of sound in different units?

Accepted Answer

The speed of sound at sea level (20°C) is approximately 343 m/s, 1,235 km/h, or 767 mph. This is also known as Mach 1. At higher altitudes or different temperatures, the speed of sound varies. Use our quick conversion preset to see this value in all units instantly.

Question 6

How do I convert mph to m/s?

Accepted Answer

To convert miles per hour to meters per second, multiply by 0.44704. For example, 60 mph = 60 × 0.44704 = 26.82 m/s. This conversion is useful for scientific calculations, physics problems, and understanding vehicle performance in metric units.

Question 7

What is the difference between speed and velocity?

Accepted Answer

Speed is a scalar quantity (magnitude only) measuring how fast something moves. Velocity is a vector quantity (magnitude and direction) that includes the direction of motion. For conversion purposes, the units are the same - our converter handles both speed and velocity calculations.

Question 8

Why do different countries use different speed units?

Accepted Answer

Most countries use km/h (kilometers per hour) as part of the metric system. The United States, UK (partially), and a few other countries use mph (miles per hour). This historical difference stems from the imperial vs metric measurement systems. Understanding both is essential for international travel and communication.

Object/Limit	km/h	mph	m/s
Walking	5 km/h	3.1 mph	1.4 m/s
Running	20 km/h	12.4 mph	5.6 m/s
City Limit	50 km/h	31 mph	13.9 m/s
Highway	120 km/h	75 mph	33.3 m/s
Speed of Sound	1,235 km/h	767 mph	343 m/s
Commercial Jet	900 km/h	559 mph	250 m/s

Speed Converter

Speed Converter

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Speed Reference

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