MPH to KMH Converter

About Speed Conversion

Converting miles per hour to kilometers per hour? You'll need this constantly if you travel, drive internationally, or follow sports. MPH is standard in the US, but most of the world uses KMH for speed measurements. Understanding both is essential for safe driving and following international events.

One mile per hour equals 1.609344 kilometers per hour. For quick mental math, you can multiply by 1.6—it's close enough for most purposes. Sixty miles per hour is about 96 kilometers per hour. Seventy mph is roughly 112 km/h. The exact conversion matters more when you're dealing with speed limits or trying to stay legal while driving abroad.

Kilometers per hour are the international standard. Pretty much every country except the US and UK uses KMH for speed limits, vehicle speeds, and speed measurements. Your car's speedometer might show both, but road signs and GPS systems will display speeds in kilometers per hour in most places.

Driving internationally is where this conversion becomes critical. If you rent a car abroad or drive your own vehicle in another country, speed limits are almost always in kilometers per hour. A 50 km/h speed limit means about 31 mph. Highway speeds of 120 km/h are roughly 75 mph. Getting these conversions wrong can mean speeding tickets or, worse, unsafe driving. Understanding KMH helps you drive safely and legally when you're outside the US.

Speed limits vary by country, and they're all in kilometers per hour internationally. Urban areas might have 30 km/h limits (about 19 mph), while highways could be 130 km/h (roughly 81 mph). Your GPS or navigation app might convert these, but road signs won't. Being able to quickly convert helps you understand how fast you should be going without relying on technology.

Road trips across borders require constant conversion. You might start in the US where everything's in miles per hour, then cross into Canada or Mexico where signs switch to kilometers per hour. Your car's speedometer might show both units, but being able to mentally convert helps you understand speed limits and drive appropriately.

Racing and motorsports use different units depending on where the event is held. Formula 1 and other international series measure speeds in kilometers per hour, while NASCAR in the US uses miles per hour. A car hitting 200 mph in NASCAR is traveling at about 322 km/h. Understanding both units helps when you're following different racing series or comparing speeds across events.

Cycling and running speeds often get measured in both units. Professional cyclists might average 25 mph on flat terrain, which is about 40 km/h. Marathon runners maintaining a 6 mph pace are running at roughly 9.7 km/h. If you're following training plans or comparing your speeds to international standards, converting helps you understand where you stand.

Weather reports and wind speeds sometimes mix units. A hurricane with winds of 100 mph has winds around 161 km/h. Strong winds might be reported as 50 km/h in international forecasts, which is about 31 mph. Converting helps you understand weather conditions regardless of where the report originates.

Vehicle specifications and reviews often list speeds in different units. A car's top speed might be given as 155 mph in US reviews but 250 km/h in European reviews. They're the same speed—understanding the conversion helps when you're comparing vehicles or reading reviews from different regions.

Even treadmill speeds involve this. Most treadmills let you choose between miles per hour and kilometers per hour. If you're used to running at 6 mph but the treadmill is set to kilometers, you'd want to run at about 9.7 km/h to maintain the same pace. Converting helps you keep consistent training speeds regardless of which unit the machine uses.

Sports like tennis, baseball, and golf measure ball speeds in both units. A tennis serve might be 120 mph (about 193 km/h), while a baseball pitch could be 95 mph (roughly 153 km/h). Golf ball speeds are often measured in miles per hour in the US but kilometers per hour internationally. Converting helps when you're comparing athletes or following international competitions.

Flight and aviation speeds sometimes involve this too. While aircraft use knots (nautical miles per hour), some general aviation or private planes might reference speeds in miles per hour or kilometers per hour depending on where they're operating. Understanding conversions helps when you're learning to fly or reading aviation information.

This converter makes it simple. Type in miles per hour, get kilometers per hour instantly. No multiplication by 1.6, no mental math while you're driving. It works offline so you can use it anywhere—in your car, at the track, or while planning trips. Free, straightforward, and does exactly what you need—converts MPH to KMH without any hassle.

Features

Instant conversion from MPH to KMH
Real-time calculations
Common speed reference table
High precision results
Mobile-friendly interface
No registration required

How to Use

Enter speed in MPH
Get instant conversion to KMH
View common speed references
Copy results as needed

Understanding Speed Units

Miles per Hour (MPH)

Imperial/US unit
Used in US/UK
Common for road speeds
Vehicle speedometers

Kilometers per Hour (KMH)

Metric system unit
International standard
Used worldwide
SI derived unit

Common Conversions

Road Speeds

30 MPH = 48.28 KMH (urban speed limit)
55 MPH = 88.51 KMH (highway speed)
70 MPH = 112.65 KMH (freeway speed)
100 MPH = 160.93 KMH (racing speed)

Sports Speeds

15 MPH = 24.14 KMH (running speed)
25 MPH = 40.23 KMH (cycling speed)
90 MPH = 144.84 KMH (tennis serve)
200 MPH = 321.87 KMH (F1 racing)

Applications

Driving

Speed limits
Vehicle speeds
Trip planning
Fuel efficiency

Sports

Running pace
Cycling speed
Ball sports
Racing

Travel

International driving
Speed conversions
Navigation
Weather reports

Why Use Our Converter

Instant results
High accuracy
Clear interface
Works offline
Free to use
No ads or popups