Miles to Kilometers Converter
Convert mi to km instantly — road trips, running, and more.
Type a distance in miles and get the exact kilometer equivalent instantly. The converter multiplies by the exact 1.609344 km per mile — the international definition.
How it's calculated
kilometers = miles × 1.609344. The factor is exact: the international mile is defined as 1,609.344 meters.
How the mile-to-kilometer conversion works
The international mile is defined as exactly 1,609.344 meters, which is exactly 1.609344 kilometers. Converting miles to kilometers is therefore one multiplication: kilometers = miles × 1.609344. The converter applies the full-precision factor, so long distances stay accurate — rounding errors would otherwise grow with every mile.
Because the relationship is perfectly linear, pace conversions work the same way: a 7-minute mile is a 4:21 per-kilometer pace, since each mile contains 1.609344 kilometers.
Common mile to kilometer reference points
Road-trip anchors: 1 mi is 1.609 km, 5 mi is 8.047 km, 10 mi is 16.093 km, 50 mi is 80.467 km, 100 mi is 160.934 km, and 300 mi is 482.803 km. Speed limits translate too: 30 mph is 48.28 km/h, 60 mph is 96.56 km/h, and 70 mph is 112.65 km/h.
Running landmarks: a 5K race is 3.107 miles, a 10K is 6.214 miles, a half marathon (13.1 mi) is 21.082 km, and the classic marathon distance of 26.2 miles is 42.16 km — just shy of the official 42.195 km.
Where you'll use miles to kilometers
Driving abroad is the big one: rental cars and road signs in most countries show kilometers, while US drivers think in miles. Knowing that 100 miles is 160.93 km helps you read a European trip computer without mental gymnastics.
Runners training with international plans, cyclists comparing routes on metric apps, and anyone reading a car's odometer across the border all need this conversion constantly. For fuel economy, remember that mpg and L/100 km invert the relationship — our fuel economy converter handles that separately.
Frequently asked questions
How many km is 10 miles?
10 miles is exactly 16.09344 km, usually rounded to 16.09 km. Enter 10 in the converter above to see it.
How do I convert miles to km in my head?
Multiply by 1.6 for a quick estimate (10 × 1.6 = 16 km, close to 16.09). An even easier trick: take the miles, halve them, and add the half back divided by 5 — or just remember the Fibonacci shortcut: 5 mi ≈ 8 km, 8 mi ≈ 13 km.
Is a mile really 1.609344 km?
Yes, exactly. The international mile is defined as 1,609.344 meters, so 1.609344 km is exact by definition.
How do I convert mph to km/h?
Multiply by the same factor: 60 mph × 1.609344 = 96.56 km/h. Our speed converter handles this and other speed units.