—— Tools
The weight you get invoiced for.
A calculator that counts the way the market counts: nominal perimeter × thickness × length × 8 — no wall deduction, no density tables. The working is shown, so you can check any quote or invoice yourself.
Section
Dimensions
Counted the way the market counts
Nominal perimeter × thickness × length × 8. A 40×40 box has a 160 mm perimeter — no wall deduction, no per-grade density. It is the same multiplication the trade does; any gap to the scale comes from thickness tolerance.