Kilometers To Miles Calculator
Convert distance from kilometers (km) to miles. A fundamental conversion for travel and navigation.
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Converting Kilometers to Miles and Vice Versa
The conversion between kilometers (km) and miles is one of the most common distance conversions people need, especially for travel, sports, and international communication. While most of the world uses the metric system (kilometers), the United States and a few other countries still use the imperial system (miles).
Defining the Units
The kilometer (km) is a unit of length in the metric system, equal to one thousand meters. It is the standard unit for measuring distances between geographical locations on land.
The mile, specifically the statute mile, is a unit of length in the imperial and US customary systems. It is defined as 5,280 feet.
The Key Conversion Factors
The official conversion factor, as defined internationally, is based on the relationship between the meter and the inch.
- 1 mile = 1.609344 kilometers (exactly)
From this, we can derive the factor to convert from kilometers to miles:
- 1 kilometer = 1 / 1.609344 ≈ 0.621371 miles
Conversion Formulas:
- To convert kilometers to miles: Miles = Kilometers × 0.621371
- To convert miles to kilometers: Kilometers = Miles × 1.60934
A Simple Rule of Thumb
For a quick mental estimate, you can use the "Rule of 8 and 5". This is based on the Fibonacci sequence and provides a decent approximation.
- To convert miles to km, multiply by 8 and divide by 5 (e.g., 5 miles ≈ 8 km).
- To convert km to miles, multiply by 5 and divide by 8 (e.g., 8 km ≈ 5 miles).
While not exact, this can be very useful for quick calculations when you don't have a calculator handy.
Kilometers to Miles Conversion Chart
| Kilometers (km) | Approx. Miles |
|---|---|
| 1 km | 0.62 mi |
| 5 km | 3.11 mi |
| 10 km | 6.21 mi |
| 21.1 km (Half Marathon) | 13.1 mi |
| 42.2 km (Marathon) | 26.2 mi |
| 100 km | 62.14 mi |
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