About the Miles to KM Converter
Road signs, running apps and maps use miles in the United States and the United Kingdom, and kilometres almost everywhere else. This converter changes miles into kilometres, or kilometres into miles, in a single step, using the exact definition of one mile as 1.609344 kilometres. It also shows the distance in metres, in feet or yards, and lists common race distances such as the 5K, 10K, half marathon and marathon in miles, so you can plan your training whichever unit your watch uses. Type a number and read the answer straight away.
Updated October 2026
How to use the Miles to KM Converter
- 1Choose miles to kilometres or kilometres to miles.
- 2Enter the distance.
- 3Read the converted distance in the large result.
- 4Check metres, feet or yards in the table.
- 5See the race distances in miles.
Quick reference
- 1 mile = 1.609 km.
- 5 miles = 8.05 km.
- 10 miles = 16.09 km.
- 26.2 miles = 42.16 km.
- 1 km = 0.621 miles.
- 100 km = 62.14 miles.
Pace and speed
To compare running paces, convert them the same way. A pace of 10 minutes per mile is 6 minutes 13 seconds per kilometre, and a speed of 60 miles an hour is 96.6 kilometres an hour. When you drive abroad, check whether signs and the speedometer use miles or kilometres, because a speed limit of 50 means very different things in each unit.
Runners and cyclists often switch between the two units, since races, shoes and apps vary by country. A 5 mile run is 8.05 km, a 100 mile ride is 160.9 km, and a 50 km ultramarathon is 31.07 miles. Many watches show both. If you are following a training plan in miles, convert the long run distances once, write them down, and you will not need to do the maths on the day.
Drivers abroad should know that speeds and distances on road signs use a different unit from the one they are used to. In the UK and US, limits are in miles per hour, while in most other places they are in kilometres per hour. A limit of 30 mph is 48 km/h, 60 mph is 97 km/h and 70 mph is 113 km/h. Fuel economy also changes with distance units, so a car doing 30 miles per gallon manages about 12.8 kilometres per litre in US gallons.
Mental conversion tricks
To change miles to kilometres in your head, add half the miles and then a tenth: 20 miles is 20 + 10 + 2 = 32 km, close to the exact 32.19. To go from kilometres to miles, multiply by 6 and drop a zero: 50 km × 6 = 300, so 30 miles, close to the exact 31.07. The Fibonacci numbers also approximate it, since the ratio of neighbouring terms is near 1.618.
Related tools
The Pace Calculator and Speed Calculator work out times and speeds, the Mileage Calculator handles trip reimbursement, the Trip Cost Calculator estimates fuel, and the Unit Converter covers all the other length units.
Features
- Both directions
- Exact 1.609344 factor
- Metres, feet and yards
- Race distances in miles
- Mental-maths tip included
- Free and private
Frequently asked questions
How do I convert miles to km?
Multiply the miles by 1.609344. A marathon of 26.2 miles is 42.16 km. For a quick estimate, multiply by 1.6, or add half and then a tenth of the miles.
How do I convert km to miles?
Multiply the kilometres by 0.621371, or divide by 1.609344. A 10K race is 6.21 miles. A rough mental rule is to multiply by 0.6.
How far is a marathon in miles and km?
A marathon is 26.2188 miles, which is exactly 42.195 kilometres. A half marathon is 13.1094 miles, or 21.0975 km.
How many km is 5K in miles?
3.11 miles. A 10K is 6.21 miles, and 15K is 9.32 miles.
What is a mile?
The statute mile is 5,280 feet or 1,760 yards, defined since 1959 as exactly 1,609.344 metres. A nautical mile is different, at 1,852 metres, and is used at sea and in the air.
Which countries use miles?
The United States, the United Kingdom for road distances, and a few others such as Liberia and Myanmar. Most countries use kilometres.