Convert miles to kilometers, meters, feet, yards, nautical miles, and more. Includes race distance references and world city-pair distances.
The mile remains the standard unit for road distances, speed limits, and race lengths across the United States, the United Kingdom, and several other countries. Yet scientific, aviation, and international contexts demand kilometers, meters, nautical miles, or other units. A reliable mile converter that handles all of these is an everyday necessity for runners, drivers, pilots, and engineers.
This mile conversion calculator supports ten conversion directions — miles to/from kilometers, meters, feet, yards, and nautical miles — with up to 10-decimal-place precision. Preset buttons load common values like 5K, marathon, and century-ride distances instantly. Eight output cards display the result in every relevant unit simultaneously, including track laps and total inches for niche applications.
A comprehensive distance reference table lists race distances from the quarter mile to astronomical scales, and a collapsible world city-to-city distance table adds real-world context. Whether you are planning a road trip, analyzing race splits, converting aviation waypoints, or just satisfying curiosity, this calculator delivers every answer on one page.
Runners track race distances in both miles and kilometers. Pilots convert between statute and nautical miles. International travelers compare road signage. This calculator handles all of these conversions with adjustable precision and contextual reference data, saving time and eliminating conversion mistakes across planning, navigation, and reporting tasks in real-world scenarios.
Miles to Kilometers: km = mi × 1.609344 | Kilometers to Miles: mi = km ÷ 1.609344. Also: 1 mi = 5,280 ft = 1,760 yd = 1,609.344 m ≈ 0.86898 nmi.
Result: 26.2 mi = 42.165 km
26.2 miles × 1.609344 = 42.165 km. A marathon is 42.195 km officially (26.2188 mi); the slight difference comes from the rounded 26.2 mi commonly quoted.
The word "mile" comes from the Latin *mille passus* (a thousand paces), the Roman unit of about 4,854 feet. Over centuries, the English mile evolved to today's statute mile of 5,280 feet, standardized by an act of Parliament in 1593. The international agreement of 1959 defined the inch as exactly 25.4 mm, which fixed the mile at exactly 1,609.344 meters for all time.
Road races worldwide use both miles and kilometers. US events post mile markers; European events use kilometer markers. Runners converting pace (min/mi to min/km) use the 1.609344 factor constantly. Cyclists measure century rides in miles (100 mi = 160.9 km) or metric centuries (100 km = 62.1 mi). This calculator lets you flip between systems instantly with race-distance presets.
Nautical miles are based on the geometry of the Earth: one nautical mile equals one minute of latitude. At 1.15078 statute miles, a nautical mile is about 15% longer. Aviation altitudes are in feet, speeds in knots (nmi/h), and distances in nautical miles. Converting between the two is critical for flight planning and maritime charting.
Exactly 1.609344 kilometers. This is a defined conversion factor, not a rounded approximation.
There are exactly 5,280 feet in one statute mile. This fixed value is used in surveying, mapping, and roadway design.
A statute mile is 5,280 feet (1.609 km). A nautical mile is 6,076 feet (1.852 km) — about 15% longer. Nautical miles are used in aviation and maritime navigation.
A 5K equals approximately 3.107 miles. This is why most runners round it to 3.1 miles in training plans.
A marathon is officially 42.195 km, which is 26.2188 miles — commonly rounded to 26.2 mi.
The US never fully adopted the metric system. Road signs, speed limits, and legal land descriptions remain in miles by law and custom, making conversion tools essential for international contexts.