Hand held pipe bending calculator

A hand held mechanical pipe bending calculator, comprising:

• an upper annular disc having a first arcuate numerical scale marked at its circumferential perimeter and having a window and a pointing arrow proximate said window, said first arcuate numerical scale graduated in units of linear measurement that relate to the depth of offset or saddle for a given bend of pipe;
• a lower annular disc rotatably coupled to said upper disc, said lower disc having a larger diameter than said upper disc and having a second arcuate numerical scale graduated in units of linear measurement which relate to the distance between bends for a given angle of bend and which correspond to the depth of offset or saddle shown on said first arcuate numerical scale, said second arcuate numerical scale marked to be in proximity to said circumferential perimeter of said upper disc such that said first and second arcuate numerical scales may be aligned for calculations;
• and
• a third arcuate scale imprinted on said lower disc viewable through said window of said upper disc, said third scale graduated in degrees of angle and having a first part wherein the degrees of angle increase in a counterclockwise direction, and a second part wherein the degrees of angle increase in a clockwise direction, wherein each of said first and said second parts of said third arcuate scale relate to the degree of bend of an offset bend and to the degrees of the outside bends in a saddle.