What is the pipe fitting formula for 90 degree elbow?

This is my question answer

what is the pipe fitting formula of90 degree elbow is38.1

Ans;ex6"x38.1=228.6

long neck1" =1.5" length

short neck1"=1.25" length

Ten(90÷2)×1.5×25.4=38.1

Ten(45÷2)×1.5×25.4=15.78

I have a table for calculation. Hope it helps

If it is long radius it is1.5 x dia. Short radius is1 x dia.

Example: On a6 inch pipe it would be9 inches for long radius and6 inches for short radius.

Hope that helps!

for ex:6in*38.1