Convert mile to kilometer.

About this conversion

Miles-to-kilometers: multiply by 1.609344. The most common road-distance conversion, used whenever you cross a border between miles-using and km-using countries, or read a US-based GPS spec in a metric context.

Formula

km = mi × 1.60934

Real-world examples

Reference values

Tips & tricks

• Mental shortcut: multiply by 1.6 for a quick estimate. 60 mi ≈ 96 km.
• A marathon is exactly 42.195 km by definition (set in 1908). It's commonly called "26.2 miles" because 42.195 km = 26.219 mi.
• Nautical miles (1.852 km) and statute miles (1.609 km) are different — used for sea and air navigation respectively. Don't confuse them.

Origin & history

The statute mile (5280 ft = 1609.344 m) traces to the Roman mille passus ("a thousand paces"). The metric kilometer was introduced with the French Revolutionary metric system in 1799.

What is a mile?

The international (statute) mile equals exactly 1,609.344 meters or 5,280 feet. Road distances and speed limits in the US, UK, and a handful of other countries.

What is a kilometer?

One kilometer equals exactly 1,000 meters. Road distances, geographic distances, marathon running, and everyday long-distance measurement worldwide except in the US, UK and a few other countries.

Everyday reference points for mi

If the unit feels abstract, comparing it to known objects often helps. 1 mi is a 15-20 minute walk for an average person; 26.2 mi is the marathon distance; and 250,000 mi is roughly the distance from Earth to the Moon.

How to convert mile to kilometer

To convert a value from mile (mi) to kilometer (km), apply the conversion factor shown in the formula above. The calculation is the same whether you do it by hand, in a spreadsheet, or with the live converter on this page.

Steps:

1. Take your input value in mi.
2. Apply the formula see formula above.
3. The result is your value in km.

For repeated calculations, save the formula in a spreadsheet or use the live converter at the top of this page — it handles the math automatically and displays the result as you type.

Frequently asked questions

How do I convert mi to km?

Apply the formula mi → km shown above, or just type your value into the converter at the top of this page. The result updates instantly.

Which is bigger, mi or km?

This depends on the conversion ratio in the formula. If the factor multiplied by your value gives a larger number, then km is the smaller unit (so it takes more of them to express the same quantity). If the result is smaller, then km is the larger unit.

When would I use mi versus km?

Both units measure length, so the choice depends on context. Mile is typically used for engineering specs, construction, navigation, and everyday measurement; kilometer similarly. Most professional fields standardize on one or the other based on regional conventions or technical tradition.

How precise is this mi to km conversion?

The conversion factor shown is the internationally defined exact value (or the best-published approximation if the relationship is irrational, like degrees-to-radians). The live converter on this page uses double-precision floating-point math, accurate to about 15 significant digits — far beyond any practical engineering need.

Is the conversion ratio exact, or an approximation?

Most unit conversions between SI metric units, and between SI and US customary units, have been formally defined as exact values since the 1959 international yard-pound agreement and subsequent SI redefinitions. Exceptions are unit pairs that involve irrational numbers (radians, e.g.) or empirical conversions (like food calories, which depend on temperature). When in doubt, consult the formula at the top of this page.

Related conversions

See also