Earth Rotation Speed Calculator

Find your approximate speed caused by Earth’s rotation at a given latitude. This is the ground speed relative to Earth’s axis (ignores elevation).

Pick a preset or enter your own latitude.
Use negative for southern latitudes.
Speed ≈ (Earth circumference at your latitude) ÷ (sidereal day). Maximum at equator, zero at the poles.
Uses a simple spherical Earth model.
How we calculate

v = (2πR cos(latitude)) / T, where R is Earth’s radius and T is a sidereal day (~23h 56m).