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AOne degree of latitude is taken as about 111.32 km, the average over the WGS84 ellipsoid. It is an approximation: a degree of latitude varies from 110.57 km at the equator to 111.69 km at the poles, and a degree of longitude shrinks with the cosine of latitude, reaching zero at the poles.
AThe nautical mile was historically defined as one minute (1/60 of a degree) of latitude, which averages 1,852 m on the ellipsoid, and that value was later fixed by international agreement. It remains the standard for aviation and maritime distances, along with speeds expressed in knots.
AOne statute mile is exactly 5,280 feet, or 1.609344 km. Note that a US survey mile differs only in the sixth decimal of kilometres and is negligible for everyday use, while the nautical mile is a different unit entirely at 1.852 km.