Gravitational Force Calculator
Works out the pull between two masses.
Gravitational force
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Acceleration of mass 1 — m/s²
Acceleration of mass 2 — m/s²
The formula
F = G m₁ m₂ ÷ r²
G = 6.6743 × 10⁻¹¹ N·m²/kg², the CODATA recommended value. It is measured, not exact, unlike the speed of light. r runs between centres, which works for spheres and for objects far smaller than the gap.
What to watch out for
Gravity between everyday objects is tiny. It only becomes significant when at least one mass is enormous.
Frequently Asked Questions
How strong is the pull between the Earth and the Moon?
About 1.982×10^20 N.
How strong is the pull between two 70 kg people 1 m apart?
About 3.270×10^-7 N.