Miles to km Calculator - Convert Miles to Kilometers

About the Miles to km Calculator

Miles still measure distances in the United States and on British roads, and many famous distances — the marathon's 26.2 miles, the four-minute mile, a 100-mile ride — are known by their mile figures. Everywhere else, and in most scientific and sporting records, distances are in kilometres. Converting miles to kilometres helps when planning a trip on metric maps, comparing a running log with a race in km, or reading a US car's range in a European context.

This miles to km calculator converts miles to kilometres exactly. It also shows the distance in metres and nautical miles, and how long it takes to walk at 3 mph and to drive at 60 mph.

How to Use the Miles to km Calculator

Enter the distance in miles. Decimals such as 26.2 or 0.25 are fine.

The kilometres appear straight away with metres, nautical miles and travel times.

The Formula

  kilometres = miles × 1.609344
  metres     = miles × 1,609.344
  nautical miles = kilometres ÷ 1.852

A statute mile is 1,760 yards, and a yard is exactly 0.9144 metres, so the factor 1.609344 is exact.

Step-by-Step Example

26.2 miles to kilometres.

  26.2 × 1.609344 = 42.1648 km

So the everyday "26.2 miles" is 42.1648 km. The official marathon is 42.195 km, a few tens of metres longer, because 26.2 is itself a rounded figure for 26.2188 miles.

100 miles is 100 × 1.609344 = 160.934 km. Driving at 60 mph it takes 1 hour 40 minutes; walking at 3 mph, more than 33 hours.

Quick Reference

  1 mi     = 1.609344 km
  3 mi     = 4.82803 km
  5 mi     = 8.04672 km
  10 mi    = 16.0934 km
  13.1 mi  = 21.0824 km
  50 mi    = 80.4672 km
  100 mi   = 160.934 km

Five miles is almost exactly 8 kilometres, which is the basis of the quick 8/5 rule.

Quick Mental Conversions

Multiply by 1.6: 50 miles is about 80 km (exactly 80.4672). The error is about 0.6 percent.

Multiply by 8 and divide by 5: the same thing in whole numbers, handy for mental arithmetic.

Add 60 percent: 30 miles plus 18 is 48 km, against the exact 48.2803.

Speed Limits and Travel

Speeds follow the same factor. A 30 mph urban limit is 48.3 km/h, usually matched by 50 km/h signs abroad; 60 mph is 96.6 km/h, and 70 mph, the UK motorway limit, is 112.7 km/h. When driving a car with a mph speedometer in a country with km/h limits, convert the limit to mph before setting off: 130 km/h, common on European motorways, is about 80.8 mph.

Running and Cycling

Running logs in miles often need converting for race entries in kilometres. A weekly total of 30 miles is 48.3 km; a 20-mile long run, a staple of marathon training, is 32.2 km. Cyclists' century rides are 100 miles, 160.9 km, while a metric century is 100 km, about 62.1 miles. Pace converts by dividing: 8 minutes per mile is about 4 minutes 58 seconds per kilometre.

Where Miles Came From

The mile descends from the Roman mille passus, a thousand double paces, about 1,480 metres. England fixed the statute mile at 8 furlongs, or 5,280 feet, in 1593 so that it would fit whole numbers of furlongs used in farming. The 1959 international yard tied it to the metre, giving today's exact 1,609.344 metres.

Fuel and Range

Electric and petrol cars sold in the US quote range in miles, while European and Asian listings use kilometres. An electric car with a 300-mile range can drive about 483 km on a full charge, and a petrol car doing 400 miles on a tank covers about 644 km. When planning a long drive abroad, convert the range and the distances between charging stations or fuel stops into the same unit, and allow a margin: real-world range usually falls in cold weather and at motorway speeds.

Distances in Everyday Life

Converting a few familiar distances helps build a feel for kilometres. A one-mile walk is about 1.6 km and takes 15 to 20 minutes; a 3-mile run is about 4.8 km, a little short of a 5K; and a typical daily commute of 15 miles is just over 24 km each way. Flight distances quoted in miles convert the same way: the roughly 3,450 miles from London to New York is about 5,550 km.

Understanding Your Result

The headline is the distance in kilometres.

The metres line gives the same distance in metres.

The nautical miles line gives the distance for sea and air navigation.

The travel time line shows the time walking at 3 mph and driving at 60 mph.

When Should You Use This Calculator?

Use it to plan trips on metric maps or in countries that use kilometres.

Use it to convert running and cycling distances for races and training plans.

Use it to understand US and UK distances in news, guides and reports.

Use it for speed limits and vehicle ranges given in miles.

Common Mistakes

Dividing by 1.609344. From miles to kilometres, multiply.

Confusing statute and nautical miles. A nautical mile is 1.852 km.

Rounding the factor to 1.5. That is nearly 7 percent low.

Mixing mph limits with km/h speedometers. Convert the limit, not just the distance.

Assuming 26.2 miles is exactly a marathon. The exact figure is 42.195 km, which is 26.2188 miles.

Rounding too soon. Convert the full distance first, then round the answer.