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The idea of a Black Hole is a direct result
of Einstein’s general relativity and the
space-time curvature described in it. The
basic idea is that a Black Hole is an imploded
star with an incredibly high mass but a
relatively tiny volume, it is so dense that
it is surrounded by an "event horizon” at which
nothing inside of that boundary can escape
it’s gravitational force. The term “Black Hole”
comes from the phenomena that not even light
from inside the event horizon can escape to
the outside universe so you would only see
a black sphere where the horizon is. The
center of the Black hole is the "singularity”
where all the mass is concentrated into an
incredibly small pointlike center. The size
of the event horizon is directly proportional
to the amount of mass in the singularity.
So if you know a Black Hole’s mass you can find it’s
radius and the other way around.



The idea of a Black Hole is a direct result of Einstein’s general relativity and the space-time curvature described in it. The basic idea is that a Black Hole is an imploded star with an incredibly high mass but a relatively tiny volume, it is so dense that it is surrounded by an "event horizon” at which nothing inside of that boundary can escape it’s gravitational force. The term “Black Hole” comes from the phenomena that not even light from inside the event horizon can escape to the outside universe so you would only see a black sphere where the horizon is. The center of the Black hole is the "singularity” where all the mass is concentrated into an incredibly small pointlike center. The size of the event horizon is directly proportional to the amount of mass in the singularity. So if you know a Black Hole’s mass you can find it’s radius and the other way around.	Mass of a Black Hole Program S.U. Clusters Dos Version
These are two identical programs for calculating the size of a Black Hole. The one uses a graphics library only supported at Syracuse University computer clusters, and the other is a boring dos version which can be run anywhere.