This calculator provides facility to calculate trigonometric functions as well as easily enter dimensions of various piping fittings. Here is small description
of some of the functions that may not be self explanatory.

Tan 1/2

Tan of half the degree entered is useful to calculate center to end distance of custom degree elbow.
Simply multiply 90 degree elbow center to end dimension with tan of half of required elbow angle.
First enter elbow angle in degrees and then press tan 1/2. Multiply the result with elbow radius.

Tan RO 45

This button helps finding out travel of pipe when rolled in 3 dimension using 45 degree elbows only. First enter vertical rise dimension then press Travel RO 45 Button.
Next enter horizontal offset. Press equal to sign to get pipe travel.

x/y

This button helps you convert inch fraction in x/y format to decimal format for calculations purpose. First enter whole inch then press this button to add fractional inches part.

Various Fittings Buttons

These buttons enter dimensions of pipe fittings required for cutting pipe to required length. A dialog box help you choose NPD, Rating or type of the fitting.

Steel Density ϱ

This button enters steel density in various units which can be selected from dialog box. Use to calculate approximate weight of steel fittings or pipe

Value of Pi : π

This enters value of constant Pi = 3.14159 which is a ratio of circumference of a circle to its diameter