Miles to Kilometers (mi to km) Converter

Miles to Kilometers

The mile-to-kilometer conversion is essential for travellers, runners, and anyone dealing with international distances. The US, UK, and a few other countries use miles for road distances, while most of the world uses kilometres.

One mile equals exactly 1.609344 km. For quick mental math, multiply miles by 1.6 to get a close approximation.

When You Need This

International Driving

Rental odometers and road signs abroad show kilometres.

Marathon Running

Race distances (5K, 10K, half, full) are officially measured in kilometres.

Trip Planning

Estimate driving times when distances are given in the other unit.

How to Use This Converter

Enter miles

Type the mile value in the top field. Kilometres appear instantly below.

Read kilometres

The result updates live to 8 decimal places using the exact factor.

Copy or swap

Copy for trip planners, or swap to convert km back to miles.

Conversion Formula

km = miles × 1.609344 • Quick estimate: multiply by 1.6. Same factor for speed: 60 mph = 96.6 km/h.

Driving & Running Distances

Distance	Miles	Kilometres
Half marathon	13.1 mi	21.1 km
Marathon	26.2 mi	42.195 km
Day's drive	250 mi	402 km
Long drive	500 mi	805 km

Features

Instant As-You-Type Results

The result updates the moment you enter a number — no button to press, no page reload.

One-Click Swap

The swap button between the two fields reverses the direction instantly, so you can convert back without retyping.

Copy Without the Unit

Each field has its own copy button that grabs only the number, ready to paste into forms, spreadsheets, or documents.

Searchable Unit Picker

Each dropdown has a search box — switch to any other length unit and use it as a general-purpose converter.

Travel & Running

The Marathon

A marathon is 26.2 miles or 42.195 km — a distance standardised at the 1908 London Olympics.

Speed Conversion

The same factor converts speed: 70 mph ≈ 113 km/h, so highway driving translates directly.

Works everywhere, stays private. Mobile-friendly while travelling, no app to install, runs offline after loading, and tracks nothing.

Frequently Asked Questions

How many km is 1 mile?

1 mile equals exactly 1.609344 kilometres. For quick estimates, use 1.6 km per mile.

Why does the UK use miles but kilometres on some products?

The UK uses miles for road distances and speed limits but adopted the metric system for most else, creating a hybrid where fuel is sold in litres but economy is in miles per gallon.

How long is a marathon in km?

A marathon is exactly 42.195 kilometres (26.2 miles), a distance standardised at the 1908 London Olympics.

Is a 5K race 5 miles?

No — a 5K is 5 kilometres, which equals 3.1 miles. Likewise a 10K is 6.2 miles, not 10 miles.

How do I convert driving distances for a road trip?

Multiply your mileage by 1.6 to get kilometres. For time estimates, remember that 100 km at 100 km/h takes one hour — the maths is simpler in metric.

Miles to Kilometers