Which countries use mph or kph?

Which countries use mph or kph: 91% use kilometers

Understanding which countries use mph or kph is essential for international travelers to avoid dangerous driving mistakes. Failing to recognize the local speed limit system causes traffic violations and compromises road safety. Discover the regional signage standards before your trip to drive safely.

Which Countries Use MPH or KPH for Driving?

Most of the world has standardized on kilometers per hour (km/h) for road traffic, but a small minority - about 9% of countries - still relies on miles per hour (mph). This global divide is essentially a split between the metric system and the Imperial (or US Customary) system, with the United States and the United Kingdom leading the mph group. Understanding which countries use mph or kph is vital for international travelers to avoid speeding fines or dangerously slow driving.

There is a fascinating middle ground in certain territories where the signs for speed and distance do not even use the same system, which I will explain in the section on hybrid countries below. Roughly 91% of the worlds 195+ nations have adopted the metric system for their road networks, ^[3] making km/h the global standard. This includes almost all of Europe, Asia, Africa, and South America.

The MPH Minority: Countries Using Miles Per Hour

Only about 17 to 20 countries and territories worldwide still use miles per hour (mph) for their speed limit signs. The most prominent members of this group are the United States and the United Kingdom, where the imperial system remains deeply rooted in road infrastructure. In the UK alone, there are over 2,300 miles of motorways, every inch of which is regulated by mph signage. ^[2]

Ill be honest: driving in these countries can feel like a step back in time if you are used to the metric system. Beyond the US and UK, several nations with historical ties to these two powers also use mph. This list of countries that use mph includes the Bahamas, Belize, Grenada, and Saint Lucia. In Saint Kitts and Nevis, for instance, the law mandates a speed limit of 20 mph in urban areas and 40 mph on open roads. ^[4] Many US territories, such as Guam and American Samoa, also follow the US standard of miles per hour.

It is not just about the signs on the road; its about the hardware in the car. Rental cars in these countries typically have speedometers where the outer, most visible ring shows mph. If you are an international driver, you might find yourself doing frantic mental math while merging into traffic. The kph to mph conversion chart for driving is roughly based on a factor of 1.609, meaning 60 mph is equivalent to approximately 96.5 km/h. Most drivers just round it up to 1.6 for a quicker, if slightly less accurate, calculation.

The KPH Majority: Why Most of the World Chose Metric

The transition to kilometers per hour (km/h) was a global movement aimed at scientific and commercial standardization. Today, almost all of the European Union (except the UK), Canada, Australia, and New Zealand use km/h. In these regions, a speed limit of 50 km/h is the most common urban standard, which translates to roughly 31 mph. Driving at 50 mph in a 50 km/h zone would result in a massive speeding violation - a mistake I nearly made during my first trip to Canada.

Ive found that the metric system is generally more intuitive for many because it aligns with the base-10 system used in most other aspects of life. In the United Arab Emirates, speed limits are enforced with high-tech precision. In Dubai and Sharjah, there is typically a 20 km/h buffer over the posted limit, but Abu Dhabi has zero tolerance. If the sign says 140 km/h and you hit 141, the AI-powered cameras will flag you immediately. This strictness is becoming more common as countries update their road safety laws.

In Asia, the adoption of km/h is nearly universal. Myanmar was one of the last major holdouts but officially completed its transition to the metric system for road laws between 2013 and 2015. Now, their expressways have a maximum limit of 100 km/h. Even countries that were once British colonies, like India and Malaysia, long ago swapped their mile markers for kilometers to align with international trade partners.

Mixed Reality: Countries with Hybrid Speed Systems

Remember the middle ground I mentioned earlier? Here is the counterintuitive truth about Puerto Rico: they use miles per hour for speed limit signs but kilometers for distance markers. You might see a sign telling you the next city is 20 km away, but the speed limit sign right next to it says 55 mph. This hybrid system is a result of Puerto Ricos unique status as a US territory that attempted a metric transition in the 1970s but never quite finished the job.

The United Kingdom also maintains a somewhat confusing hybrid identity. You might wonder, does the uk use mph or kmh for speed limits? While road signs and speedometers use mph, the government officially uses metric units for most other things, including many engineering specifications. However, the cost to convert all UK road signs to km/h has been estimated in the billions of dollars, which is why the mile remains the king of the British road. For a visitor, this means you might buy petrol in liters but track your fuel efficiency in miles per gallon.

Another interesting case is Liberia. While official government guidelines often cite km/h, many older vehicles and some road signs still reflect mph due to historically close ties with the United States. These inconsistencies highlight how geography, history, and the cost of infrastructure can keep old measurement systems alive long after the rest of the world has moved on.

MPH vs KPH: Comparing Driving Speed Standards

Miles Per Hour (MPH)

• 1 mph is equal to exactly 1.60934 kilometers per hour

• Used by approximately 9% of the world's countries and territories

• Urban: 25-30 mph; Highways: 60-75 mph

• United States, United Kingdom, Bahamas, Belize, Antigua and Barbuda

Kilometers Per Hour (KPH/KMH) - ⭐ Global Standard

• 1 km/h is equal to approximately 0.62137 miles per hour

• Standard system for 91% of the world's nations

• Urban: 50 km/h; Highways: 100-120 km/h

• Canada, Australia, EU, Asia, Africa, South America

The High-Speed Confusion: James in Canada

James, a 45-year-old software engineer from Texas, was used to the vast 75 mph highways of his home state. On a summer road trip through Ontario, Canada, he saw a bright sign that read '100.' Feeling right at home, he pushed his rental car to 100 on the dial, assuming he was in a high-speed zone.

He quickly noticed he was flying past other cars like they were standing still. The confusion set in - he was doing exactly what the sign said, so why was he moving so much faster than everyone else? He started to wonder if Canadians were just naturally cautious drivers.

The breakthrough came when he looked closer at his speedometer. He had been focusing on the large outer ring of miles per hour, but the sign was in kilometers. He was doing 100 mph - which was actually 160 km/h. He was accidentally speeding at 60% above the limit and had completely misinterpreted the traffic flow.

He immediately slowed down to the inner dial's 62 mph mark, which matched the 100 km/h limit. Within 15 minutes, his stress levels dropped and he blended perfectly with the local traffic. He learned that 'reading the sign' isn't enough - you have to read the units first.

The Puerto Rican Hybrid: Lan's GPS Struggle

Lan, a traveler from Ho Chi Minh City, rented a car in San Juan, Puerto Rico. She was comfortable with the metric system from home and was relieved to see distance signs in kilometers. However, as she left the city, she became deeply confused when her GPS and the road signs stopped matching up.

Her GPS was set to miles, but the green highway signs said '20 km' to her destination. Meanwhile, the speed limit sign read '55.' She tried to drive at 55 km/h, but trucks were honking and swerving around her. She felt panicked, thinking the local driving culture was far too intense for her.

She pulled over and realized that while distance is metric in Puerto Rico, speed is American. The '55' wasn't 55 km/h; it was 55 mph. Once she switched her mindset to this hybrid reality, the honking stopped and she could finally enjoy the coastal scenery.

After 4 days of driving, Lan reported that she had mastered the mental gymnastics of 'km for distance, mph for speed.' She reached her destination safely and warned her friends that in some places, the rules of math change every few meters.