Newton's second law (F = m·a) and universal gravitation (F = G·m₁·m₂/r²). Enter any two (or three) values and solve the rest instantly.
Enter any two of force, mass and acceleration to solve the third.Enter any three of m₁, m₂, distance and force to solve the fourth.
Enter any two of force, mass and acceleration — the third is calculated automatically.
Formula
Formula
Force: F = m × a
Mass: m = F ÷ a
Acceleration: a = F ÷ m
Enter any three of m₁, m₂, distance and force — the fourth is calculated automatically.
Formula
Formula
Force: F = G · m₁ · m₂ ÷ r²
Mass: m₁ = F · r² ÷ (G · m₂)
Mass: m₂ = F · r² ÷ (G · m₁)
Distance: r = √(G · m₁ · m₂ ÷ F)
Gravitational constantG = 6.674×10⁻¹¹ N·m²/kg²
Two modes: (1) Newton's second law F = m·a — type any two of force (N/kN/dyn/lbf), mass (kg/g/t/lb) or acceleration (m/s², cm/s², g) and solve the third. (2) Universal gravitation F = G·m₁·m₂/r² with G = 6.674×10⁻¹¹ N·m²/kg² — type any three of m₁, m₂, distance or force to solve the fourth; masses can be in Earth or Solar masses and distance in AU for astronomical problems. Everything runs locally in your browser; nothing is uploaded.