438 miles to km

438 miles ≈ 704.89 km

Multiply by 1.609344, the exact length of an international mile in kilometers: 438 × 1.609344 ≈ 704.89 km.

Divide by the same factor: 704.89 ÷ 1.609344 ≈ 438 miles. One kilometer is about 0.621371 miles, which is simply 1 ÷ 1.609344.

The international mile, fixed at exactly 1.609344 km by the 1959 yard and pound agreement. The US survey mile is about 3 mm longer, and the nautical mile is a different unit altogether at 1.852 km — the same count of nautical miles would be roughly 15 % more than about 704.89 km.