There wasn't a real itch behind any of these calculators. I wasn't standing in a hardware store doing maths on my phone. The site exists because I wanted to test how far Claude Code could go when handed a basic spec and asked to iterate. Concrete tools with clear constraints turn out to be a clean way to find that out.
The calculators work, and they are genuinely useful if you happen to need them. The actual point of the project, though, was seeing what was possible with a small amount of direction and a reasonable amount of specificity.