KM to Miles Converter — Instant Kilometers to Miles Calculator

KM to Miles Conversion Reference Table

Use this quick-reference table for the most commonly searched kilometer-to-mile conversions. All values use the exact international conversion factor (1 km = 0.621371 miles).

Reverse reference (miles to km): 0.1 miles = 0.161 km  |  1 mile = 1.609 km  |  10 miles = 16.093 km  |  26.2 miles = 42.165 km

How many miles is 1 km?

1 kilometer equals 0.621371 miles (approximately 0.62 miles). To convert any kilometer value to miles, multiply by 0.621371. For a quick mental estimate, multiply by 0.6 — this gives a result within about 3% of the exact answer. The conversion factor comes from the international definition where 1 mile = 1,609.344 meters exactly.

Source: NIST — Unit Conversion

How many miles is 5 km?

5 kilometers equals 3.107 miles. A 5K race is approximately 3.1 miles long, making it one of the most popular road race distances worldwide. The exact calculation is 5 × 0.621371 = 3.10686 miles. In running communities, a 5K is commonly described as "just over 3 miles" for simplicity.

How many miles is 10 km?

10 kilometers equals 6.214 miles. A 10K race is approximately 6.2 miles long, roughly double the distance of a 5K. The exact calculation is 10 × 0.621371 = 6.21371 miles. The 10K is a popular race distance for intermediate runners and is often described as "about 6 miles" in countries using the imperial system.

How many miles is a half marathon?

A half marathon is 21.0975 kilometers, which equals 13.109 miles (often rounded to 13.1 miles). The half marathon distance is exactly half of the full marathon distance of 42.195 km. It is one of the fastest-growing race distances in the world, bridging the gap between the 10K and the full marathon.

How many miles is a marathon?

A marathon is exactly 42.195 kilometers, which equals 26.219 miles (often rounded to 26.2 miles). The marathon distance was standardized at the 1908 London Olympics. Other common ultra-distance races include the 50K (31.069 miles), 100K (62.137 miles), and 100-mile (160.934 km) ultramarathons.

How many miles is 100 km?

100 kilometers equals 62.137 miles. This is a useful reference for highway driving — traveling at 100 km/h means you are going approximately 62 mph. The 100K ultramarathon (62.137 miles) is also a recognized long-distance running event.

How many miles is 50 km?

50 kilometers equals 31.069 miles. The 50K is the shortest standard ultramarathon distance, equaling approximately 31.1 miles — about 4.8 miles longer than a full marathon. This distance is often used as a stepping stone for runners moving into ultra-distance racing.

How do I convert km to miles?

Multiply the number of kilometers by 0.621371 to get the distance in miles. For example: 10 km × 0.621371 = 6.214 miles. Alternatively, you can divide the kilometers by 1.60934 to get the same result. For quick mental math, multiply by 0.6 for an approximate answer, or use the more accurate trick of multiplying by 5 and dividing by 8 (since 1 km is approximately 5/8 of a mile).

Is a kilometer longer or shorter than a mile?

A kilometer is shorter than a mile. One mile equals 1.60934 kilometers, so a mile is about 61% longer than a kilometer. Put another way, a kilometer is only about 62% of a mile. You would need to walk or drive approximately 1.6 kilometers to cover the same distance as 1 mile.

How many km is 1 mile?

1 mile equals exactly 1.609344 kilometers (commonly rounded to 1.609 km). This exact value comes from the international yard and pound agreement of 1959, which defined 1 yard as 0.9144 meters. Since 1 mile = 1,760 yards, the calculation is 1,760 × 0.9144 = 1,609.344 meters. For quick estimates, 1 mile is approximately 1.6 km.

Source: NIST — Unit Conversion

How many miles is 3 km?

3 kilometers equals 1.864 miles. The calculation is 3 × 0.621371 = 1.86411 miles. This is a common walking or jogging distance — roughly equivalent to 1.9 miles or just under 2 miles.

Does 2 km equal 1 mile?

No, 2 km does not equal 1 mile. 2 kilometers equals approximately 1.243 miles. One mile is actually about 1.609 km, so you would need about 1.6 km — not 2 km — to equal 1 mile. The common misconception may come from rounding, but the actual km-to-mile ratio is approximately 1.6:1, not 2:1.

What is the speed limit of 100 km/h in mph?

100 km/h equals 62.137 mph. To convert any speed from km/h to mph, multiply by 0.621371 (or divide by 1.60934). Here are other common speed limit conversions: 50 km/h = 31.07 mph, 60 km/h = 37.28 mph, 80 km/h = 49.71 mph, 110 km/h = 68.35 mph, 120 km/h = 74.56 mph, and 130 km/h = 80.78 mph.

How do I convert km to miles without a calculator?

There are several mental math tricks. The simplest is to multiply by 0.6 for a rough estimate. For better accuracy, multiply by 5 and divide by 8 (since 1 km is approximately 5/8 of a mile). The most clever trick uses the Fibonacci sequence: consecutive Fibonacci numbers (1, 1, 2, 3, 5, 8, 13, 21, 34...) approximate km-to-mile conversions because the ratio between consecutive numbers approaches the golden ratio (1.618), which is close to 1.609. So 5 km is approximately 3 miles, 8 km is approximately 5 miles, and 13 km is approximately 8 miles.

What are common running distances in km and miles?

Here are the standard race distances: 1 mile = 1.609 km, 5K = 3.107 miles, 10K = 6.214 miles, 15K = 9.321 miles, Half Marathon = 21.0975 km (13.109 miles), Marathon = 42.195 km (26.219 miles), 50K Ultra = 31.069 miles, 100K Ultra = 62.137 miles, and 100 Mile Ultra = 160.934 km. These distances are standardized by World Athletics.

Why do some countries use kilometers and others use miles?

Most countries adopted the metric system (kilometers) during the 18th-19th centuries as part of a push for universal standardization that originated in France. The United States, the United Kingdom (for road distances), and a few other countries still use miles for everyday distance measurements. The UK uses miles on road signs and for driving distances but uses kilometers in many scientific and official contexts. Nearly every other country in the world uses kilometers exclusively.

How many miles is 25 km?

25 kilometers equals 15.534 miles. The calculation is 25 × 0.621371 = 15.534 miles. This is a common distance reference for moderate road trips and is roughly equivalent to a 15-16 mile drive. Some training plans include 25 km long runs as marathon preparation.