Not accurate – Pipe Saddle Layout Calculator Review

I used it on a 90* 12 on 12 saddle with a 3/16 wall and and it's length is shot short to actual pipe Circumference. Which throws the saddle way off. I also tried it with a 3/8 wall in same pipe and took measurements first and saw that its off too.
Review by TACOinUSA on Pipe Saddle Layout Calculator.