About Km to Miles Conversion

Converting kilometers to miles is essential when traveling to countries that use imperial measurements, understanding speed limits, or dealing with vehicles from different markets.

When You Need This Conversion

Traveling to the US or UK — Road signs and speed limits are in miles per hour
Understanding speed — Converting km/h to mph for speed comparisons
Car imports — Vehicles from metric countries have speedometers in km/h
Fitness tracking — Some running apps display pace in minutes per mile

The Conversion Factor

One kilometer equals approximately 0.621371 miles. For quick mental math, multiply km by 0.6 or divide by 1.6.

Speed Limit Comparison

Highway speed limits vary worldwide. Germany's Autobahn has advisory speeds of 130 km/h (81 mph) but no maximum. US highways typically allow 65-75 mph (105-120 km/h), while UK motorways permit 70 mph (113 km/h).

How to Convert Km to Miles

Using This Tool

Enter kilometers in the top field
Read miles appearing instantly below
Copy the result for navigation apps or planning

Speed Conversions

Common speed limits translated:

50 km/h = 31 mph (city driving)
80 km/h = 50 mph (suburban roads)
100 km/h = 62 mph (highways)
120 km/h = 75 mph (fast highways)
130 km/h = 81 mph (Autobahn advisory)

Distance Conversions

Understanding distances:

1 km = 0.62 miles (about 12-15 minutes walking)
10 km = 6.2 miles
100 km = 62 miles (about 1 hour driving)

Mental Math Trick

For quick estimates: halve the km and add 10%. Example: 100 km → 50 + 5 = 55 mph (actual: 62 mph). Not precise, but useful for rough estimates.

Features

Speed Limit Reference

The quick reference table shows common speed limits converted. Instantly understand what 100 km/h or 130 km/h means in mph.

Precise Conversion

Uses the exact conversion factor (0.621371192237) for mathematical accuracy. Results shown to 8 decimal places when needed.

Bidirectional

Enter values in either field. Converting miles to km? Just type in the bottom field or click swap.

Optimized for Mobile

Perfect for on-the-go conversions while traveling. Use it in the car (as a passenger!) to understand speed limits.

No Data Collection

Anonymous — No login required
Private — Your searches aren't tracked
Local — All calculations happen in your browser

Frequently Asked Questions

How fast is 100 km/h in mph?

100 km/h equals approximately 62 mph. This is a common highway speed limit in many metric countries.

Which countries use miles instead of kilometers?

Only the United States, United Kingdom, and a few smaller territories (Myanmar, Liberia) use miles for road distances. The UK is unique in using miles for roads but liters for fuel.

How do I convert my car's speedometer?

Many modern cars have a setting to switch display units. Older cars may need a cluster replacement or an overlay. Some navigation apps can display speed in either unit as a workaround.

Is 1 km equal to half a mile?

Not exactly. 1 km = 0.62 miles, which is slightly more than half. Half a mile would be 0.8 km. The approximation "1 km ≈ 0.6 miles" is close enough for most purposes.

What's the fastest legal speed limit in km/h?

Germany's Autobahn has sections with no speed limit, though 130 km/h (81 mph) is advisory. The highest posted limit elsewhere is 160 km/h (99 mph) in the UAE.

Kilometers to Miles