What are the units of gravitational constant?

Answer 1

There are two gravitational constants.

The 'real one', the Universal Gravitational Constant, is always known as G. As its name implies it works everywhere. *

The other one, acceleration due to gravity, is g. It is good only on our own planet.

Units of g are m s-2 . Units of G are m3 kg-1 s-2 .

*Some physicists are not quite sure about this. If one starts talking to you about "Planck-length gravity" you might want to remember an urgent appointment elsewhere.

Answer 2

The units of the gravitational constant are typically represented as ( \text{m}^3 \text{kg}^{-1} \text{s}^{-2} ), which means cubic meters per kilogram per second squared.