how strong is the gravitational pull that comes out from a black hole?

Question: how strong is the gravitational pull that comes out from a black hole?
- Keywords:
  black hole,
  gravitational
Asked by Emily to Peter on 17 Nov 2016.
- Peter Boorman answered on 17 Nov 2016:
  
  Hi Emily,
  
  The gravitational force is proportional to the mass, so depending on how heavy the black hole is the gravity will be much stronger. For particular black holes like those at the centre of galaxies, these can be billions of times the mass of the Sun, and so the gravitational force can be huge!
  
  Peter

Question: how strong is the gravitational pull that comes out from a black hole?