Question 1

How do I convert miles per hour to kilometers per hour?

Accepted Answer

To convert miles per hour to kilometers per hour, use our converter above. Simply enter the value in miles per hour and get instant, accurate results in kilometers per hour. Our tool handles all speed calculations for you.

Question 2

What's the difference between speed and velocity?

Accepted Answer

Speed measures how fast something moves (scalar). Velocity includes both speed and direction (vector). In everyday use, people often say 'speed' when technically discussing velocity.

Question 3

Why do airplanes use knots instead of mph?

Accepted Answer

Knots (nautical miles per hour) relate directly to latitude coordinates, making navigation easier. One minute of latitude equals one nautical mile, simplifying aviation and maritime calculations.

Question 4

How do I convert between meters per second and mph?

Accepted Answer

To convert m/s to mph, multiply by 2.23694. To convert mph to m/s, multiply by 0.44704. Meters per second is the SI unit used in physics and science.

Question 5

Can I use this for running pace conversions?

Accepted Answer

Yes! You can convert between pace (minutes per mile or kilometer) and speed (mph or km/h). For example, a 7-minute mile is about 8.6 mph or 13.8 km/h.

Question 6

What speed units do different countries use?

Accepted Answer

Most countries use kilometers per hour (km/h). The United States and United Kingdom primarily use miles per hour (mph). Aviation worldwide uses knots, while science uses meters per second (m/s).

Question 7

How fast is the speed of sound?

Accepted Answer

The speed of sound at sea level is approximately 343 m/s, 1,235 km/h, or 767 mph (Mach 1). This speed varies with temperature and altitude.

Question 8

What's the fastest human running speed?

Accepted Answer

Usain Bolt reached 27.8 mph (44.7 km/h) during his world record 100m sprint. Average jogging is 5-6 mph, while professional marathon runners maintain about 12-13 mph.

Mile per Hour (mph)	Kilometer per Hour (km/h)
1	1.6093
2	3.2187
3	4.828
4	6.4374
5	8.0467
10	16.0934
15	24.1401
20	32.1869
25	40.2336
50	80.4671
75	120.7007
100	160.9343
250	402.3357
500	804.6714
1,000	1,609.3427

Mile per Hour to Kilometer per Hour Converter

Conversion Formula

About Mile per Hour

About Kilometer per Hour

How to Convert Mile per Hour to Kilometer per Hour

Common Mile per Hour to Kilometer per Hour Conversions

Conversion Reference Table

Real-World Speed Conversions

Driving and Road Travel

Running and Athletics

Aviation and Flight

Weather and Wind Speed

Cycling and Biking

Maritime and Boats

Speed Conversion FAQs