Free tools

Sheet metal calculators

Quick references we use in the shop, free for anyone sizing ductwork or ordering material.

Sheet metal gauge chart & converter

Gauge to inches and millimetres for steel, galvanized, stainless and aluminum, from the standard published gauge tables.

Length × width × thickness × density for steel, stainless, aluminum and copper. Pounds and kilos, per sheet or for a quantity.

Convert between round and rectangular duct sizes with the standard equal-friction formula, in both directions.

Send us your dimensions and we'll quote the metalwork.