Orbit Speed & Period Calculator

Estimate orbital speed and period around Earth based on orbital altitude. Uses a circular-orbit approximation (educational).

Pick a preset or enter your own altitude.
LEO is roughly 160–2,000 km.
Circular orbit around Earth. Ignores atmospheric drag, inclination, and Earth’s oblateness.
Good for a quick estimate.
How we calculate

We use Earth’s gravitational parameter μ and Earth radius R. For a circular orbit at radius r = R + altitude: speed v = √(μ / r), period T = 2π √(r³ / μ).