Possible to convert mmHg to kg?

Possible to convert mmHg to kg?   (09/24/2014, 4:33 AM)

I'm testing a pressure mat. I want to put a known weight on the mat (5kg) and look if this mat really messure the 5 kg.
So the mat shows per cel the vallue in mmHg. I thought if I sum all the mmHg vallue's en convert that number into kg, I can see if the mat is reliable.
Can some one help me with this.
I figured out that it is possible to convert mmHg into kg/cm^2

I would be gratefull
(sorry for my bad English)