One inch is exactly 2.54 centimeters. This has been the international standard since 1959. For example, 10 inches = 25.4 cm.

A Swedish mil is exactly 10 kilometers. This is unique to Sweden — in English-speaking countries, a 'mile' is approximately 1.609 km.

A nautical mile is exactly 1,852 meters. It is based on one minute of arc on Earth's surface and is used in maritime and aviation navigation.

One foot is exactly 0.3048 meters, which equals 30.48 cm. One yard is 3 feet = 0.9144 meters.

To convert kilometers to miles, divide by 1.60934. For example: 100 km ÷ 1.60934 ≈ 62.14 miles.