Which countries use miles instead of kilometers?

Which countries use miles instead of kilometers?

Understanding which countries use miles instead of kilometers helps international drivers navigate road signs accurately. Many travelers face confusion when regional distance and speed units differ from their home countries. Learning these global differences protects motorists from breaking local speed regulations and ensures safer travel while exploring various international territories.

The Short Answer: Who Still Uses Miles?

Only three countries primarily use miles instead of kilometers for road distances and speed limits: the United States, the United Kingdom, and Liberia.
Additionally, a few Caribbean and UK overseas territories - such as Antigua and Barbuda, the Bahamas, and the Cayman Islands - also rely on miles.
Nearly every other country in the world uses kilometers and the metric system.

While it seems like a straightforward list, the reality on the ground is a bit messier.

Currently, approximately 91% of countries worldwide use kilometers per hour for speed limits.

The few holdouts remain fiercely loyal to their traditional systems.

In the United States, typical highway speed limits range from 65 to 75 miles per hour.

Interestingly, while Liberia is officially listed as an imperial system user, it has been gradually transitioning its road infrastructure to metric over the past decade.

Caribbean and Overseas Territories

Several Caribbean and British Overseas Territories use miles for their speed limits.
This is largely due to their historical ties to the UK and proximity to the US.
If you rent a car in the Bahamas, the default speed limit outside of city settlements is 45 miles per hour.

I remember my first time driving in Grand Cayman - expecting kilometers because it felt so international - and getting thoroughly confused by the mph signs. It took me three days of constantly double-checking the speedometer to realize that my imported Japanese rental car displayed km/h while the road signs were in mph. The panic was real when I saw a 40 sign and thought I was speeding.

Why Do The US and UK Still Use The Imperial System?

The resistance to metrication in the US and UK stems from a mix of historical stubbornness, massive infrastructure conversion costs, and cultural identity.
Changing millions of road signs is not just a logistical nightmare but a massive financial burden.

The Cost of Conversion

Lets be honest - overhauling an entire national highway system takes serious political will.
The United Kingdom estimated that replacing all imperial road signs with metric ones would cost between £565 million and £644 million.
That staggering figure quickly silenced many metric advocates.

I used to think the US was just being stubborn about adopting kilometers.
Turns out, the sheer scale of the Interstate Highway System makes the transition exceptionally expensive.
State budgets are already stretched thin, so spending millions just to change numbers on metal plates ranks low on the priority list.
It makes absolutely no sense. None at all.

The UK's Confusing Hybrid Approach

The UK is particularly confusing.
They use liters for fuel, Celsius for weather, but miles for roads.
Seldom does a country split its measurement systems so drastically.
This creates a bizarre scenario where you buy fuel by the liter but measure your cars efficiency in miles per gallon.

Converting Between MPH and KMH on the Fly

Converting miles to kilometers while driving requires a simple mental trick: 1 mile equals roughly 1.6 kilometers.
If you multiply your speed in miles by 1.6, you get your speed in kilometers.
However, doing math while merging onto a highway is a terrible idea.

Researching conversions - and Ive read dozens of travel guides on this over the past three years while planning cross-border road trips - shows that relying on a dashboard sticker with pre-calculated speeds works perfectly fine for most rental cars,
even though the theoretical possibility of misreading it still makes anxious drivers nervous about getting ticketed.

Just buy a sticker.
It saves you the headache.

Everyone assumes driving in a foreign measurement system is dangerous.
But based on my experience renting cars in twelve different countries, the opposite is true.
Because you are hyper-aware of the confusing numbers, you actually pay far more attention to the road and drive much safer.

Measuring Systems Compared: US vs UK vs The World

Imperial System (US)

- Measured strictly in miles and yards

- Highly consistent; almost everything is imperial

- Displayed exclusively in miles per hour (mph)

- Gallons are used at the pump

Hybrid System (UK)

- Measured in miles and yards by law

- Highly inconsistent; mixes metric and imperial daily

- Displayed exclusively in miles per hour (mph)

- Liters are used at the pump

⭐ Metric System (Most of the World)

- Measured strictly in kilometers and meters

- Highly consistent; globally standardized and logical

- Displayed exclusively in kilometers per hour (km/h)

- Liters are used at the pump

The Cross-Border Speeding Ticket

Mark, a 35-year-old sales manager from Seattle, frequently drove across the border to Vancouver for client meetings. He felt confident on the road and usually ignored his digital speedometer settings.

During one trip, he saw a sign for 100 on the Canadian highway. He confidently pushed his cruise control to 85 mph, completely forgetting he was in a metric zone. He thought he was well under the limit.

Ten minutes later, flashing lights appeared in his rearview mirror. It took him a twenty-minute argument with the officer to realize that 100 km/h is roughly 62 mph. His American dashboard had fooled him into a massive speeding ticket.

He paid a $200 fine and learned a harsh lesson. Now, he always manually switches his digital dashboard to metric the second he crosses the border, completely eliminating the mental math and saving his driving record.