Back when I was younger and had all my hair, I decided I wanted to make my own belt rather than settling for what I could get from the store. So, I asked some advice from one of them "experts." I says, "How long do I make it?" He says "Add four inches."
"Mmm-kay. Add four inches to what" At which point I got a crash course in rocket science that I didn't want or need. So, I did what most folks do and measured out my old belt. That worked.
But then a feller asked me to make him one. Mmm-kay. No