g = GM / R²
ve = √(2GM / R) = √(2gR)
Earth: g ≈ 9.81 m/s², ve ≈ 11.186 km/s
Calculate the surface gravity and escape velocity of any planet, moon, or star by entering its mass and radius. Results are shown in standard units (m/s², m/s) alongside multiples of Earth's own values for easy comparison.