The length of one degree in kilometers is meridian and parallel.

The earth is not a ball. The planet is flattened from the poles, so the length of the equator – about 40,075 km – is greater than the length of any meridian. When dividing the length of the equator by 360 degrees, we get 111.319 km. The closer to the pole, the shorter the parallel length. At the pole, it is equal to 0. To calculate the length of a degree at a particular parallel, you need to apply trigonometric formulas. It is estimated that the circumference of the meridian is 40007 km. When divided by 360, we get the length of the degree along the meridian 111.13 km.