# Universal Gravitational Constant

Written by Jerry Ratzlaff on . Posted in Relativity

The universal gravitational constant ( $$G$$ ) is the proportionality constant used in Newton's Law of Universal Gravitation.  This constant is very difficult to measure with any high accuracy.

$$\large{ G = 6.67384 \; \left( 10^{-11} m^3 kg^{-1} s^{-2} \right) \; = \; 6.67384 \; \left( 10^{-11} Nm^2 kg^{-2} \right) }$$