How fast does the Earth rotate on its axis in km/hour?

It depends on where you're standing. If you’re standing on the equator you would say the earth rotates at a speedy 1670 kilometers/hour (1038 miles/hour). If you're standing over the North or South Pole you’d say it doesn’t move at all.

The earth is spherical (well actually a oblate spheroid). At the equator the diameter is about 40,008 kilometers. So if you are standing at the equator you’d travel 40,008 kilometers in one day or roughly 1670 kilometers/hour. Now if you were standing at the north pole you wouldn’t move from your spot so you’d be traveling at 0 km/hour.

You can estimate how fast the earth is rotating at your position using the following equation:

Cos ( your current latitude ) x 1670km/hr.

If you happen to be near New York (USA) or Madrid (Spain) or Naples (Italy) or Wellington (New Zealand), all of which are near Latitude 40° North, you’d say the earth’s rotation is 1270 km/hour.