Gravitational Force Calculator

Calculate gravitational attraction between two masses using Newton’s law of gravitation.

Default: 6.67430×10⁻¹¹.
Example: Earth ≈ 5.97e24 kg.
Example: person ≈ 70 kg.
Use center-to-center distance (r > 0).
F = G·m₁·m₂ / r²
a₁ = F / m₁, a₂ = F / m₂
Units: N for force, m/s² for acceleration.
If m₁ is Earth and r is Earth’s radius, a₂ is close to 9.81 m/s².
This is the ideal inverse-square law.