Calculator for offset pipe fitting

A calculator for calculating an angle for a pipe fitting to connect a first pipe to a second pipe disposed at an offset distance with respect to each other, comprising:

• a background sheet having printed thereon a plurality of parallel increment lines corresponding to the offset distance between the first and second pipes, a degree scale having degree readings of from 0 to 90 degrees adjacent to said increment lines, and a first pivot point;
• and
• a transparent fitting sheet having printed thereon at least one fitting graph including a degree line, a base line extending from said degree line, a plurality of curved center line arcs extending from said base line and corresponding to possible diameters, respectively, of the pipe fitting, and a second pivot point for alignment with said first pivot point and pivoting of said fitting sheet with respect to said background sheet, wherein a selected one of said center line arcs intersects one of said increment lines corresponding to the offset distance and said degree line indicates the angle for the pipe fitting on said degree scale.

A calculator for calculating an angle for a pair of pipe fittings to connect a first pipe to a second pipe disposed at an offset distance with respect to each other, comprising:

• a background sheet having printed thereon a plurality of parallel increment lines corresponding to the offset distance between the first and second pipes, at least one increment arc corresponding to a diameter of the pipes and intersecting at least a portion of said increment lines, a degree scale adjacent to said increment lines, and a first pivot point;
• and
• a transparent fitting sheet having printed thereon at least one fitting graph including a degree line, a base line extending from said degree line and a second pivot point for alignment with said first pivot point and pivoting of said fitting sheet with respect to said background sheet, wherein said base line intersects at a point said at least one increment arc corresponding to the diameter of the pipes and one of said increment lines corresponding to the difference between half the offset distance and the radius of the pipes, and said degree line indicates the angle for the pipe fitting on said degree scale.