Materials Calculators

Epoxy volumes, alloy properties, roll lengths and crystal cells — the material figures that come up in workshops, labs and fabrication. A compact set for people working with a substance rather than a finished product.

Metal is bought by weight and cut to length, so a delivery note in kilograms does not tell a fabricator how many metres of bar are on the truck.

A roll of fabric, film or paper hides its length inside the winding: you can see the outside diameter and the core, but not how many metres of material are wrapped between them.

Specific surface area is how much surface one gram or one kilogram of a material exposes: the number that decides how fast a powder dissolves, how hard a catalyst works and how much a filter can adsorb.

A 500-gram Ti-6Al-4V part at a $65 per kilogram quote costs $32.50 in raw material: half a kilogram times the per-kilo price.

When a material is sold by the sheet, the roll, or the piece, the sticker price hides the only number that lets you compare two offers honestly: what one square centimeter of it costs.

A cubic crystal repeats one small cube over and over, and the size of that cube decides a surprising amount about the material: its density, its packing, and how its atoms sit relative to each other.

Measure the space, not the bottle.