Kilometers to Miles Converter
Convert km to mi instantly — travel, running, and cycling.
Type a distance in kilometers and get the exact mile equivalent instantly. The converter divides by the exact 1.609344 km per mile.
How it's calculated
miles = kilometers ÷ 1.609344 (equivalently, km × 0.6213711922). The mile is defined as exactly 1,609.344 meters.
How the kilometer-to-mile conversion works
Because the international mile is exactly 1.609344 kilometers, converting kilometers to miles is one division: miles = kilometers ÷ 1.609344. Equivalently you can multiply by 0.6213711922, which is 1 ÷ 1.609344. Both give the same exact result; the converter uses the division form for maximum precision.
This matters most at long distances. On a 1,000 km road trip, using a rounded 0.62 factor instead of 0.6213711922 would understate the distance by 1.37 miles — enough to misjudge fuel stops.
Common kilometer to mile reference points
Travel anchors: 1 km is 0.621 mi, 5 km is 3.107 mi, 10 km is 6.214 mi, 42.195 km (a marathon) is 26.219 mi, 100 km is 62.137 mi, and 500 km is 310.686 mi.
Race distances runners know by heart: a 5K is 3.107 miles, a 10K is 6.214 miles, and a half marathon (21.0975 km) is 13.109 miles. Speeds translate the same way: 100 km/h is 62.14 mph and 120 km/h is 74.56 mph.
Where you'll use kilometers to miles
US visitors abroad meet this conversion at every road sign: speed limits, distances to cities, and rental-car trip computers all read in kilometers. A sign saying the next town is 80 km away means about 49.7 miles.
Runners following metric training plans, cyclists on European routes, and hikers reading trail guides in kilometers all convert constantly. Keep the 0.62 shortcut for estimates and the converter for anything you plan fuel, time, or money around.
Frequently asked questions
How many miles is 10 km?
10 km is 6.21371 miles, usually rounded to 6.21 mi. Enter 10 in the converter above to verify.
How do I convert km to miles in my head?
Multiply by 0.6 for a quick estimate (10 × 0.6 = 6 mi, close to 6.21). For better accuracy, halve the kilometers and add about a quarter of that half: 10 → 5 + 1.2 ≈ 6.2 mi.
How long is a marathon in miles?
The official marathon distance is 42.195 km, which is 26.2188 miles — the famous 26.2 miles.
Is 1 km half a mile?
A bit more: 1 km is 0.621 miles, so it's closer to five-eighths of a mile than half.