About StructMath

StructMath is a free library of construction and material calculators. Every tool answers one question well — how much do I need? — and ends in an order-ready list: bags, boxes, yards, tons, gallons, sticks, with cost estimates you can edit to match your store.

The site is built and maintained as an independent project. There are no accounts, no sign-up walls, and no uploads — every calculation runs in your browser.

What we stand on

• Order-ready results. We round the way suppliers sell: whole bags, quarter-yard ready-mix, whole boxes.
• Shown work. Every calculator publishes its formula, assumptions and a worked example.
• Verified, dated data. Yields, densities and coverage rates carry sources and a verification date — see Methodology.
• Honest estimates. Results are planning aids, not structural advice — always confirm with your supplier and check local codes.

Contact

Questions, corrections or partnership: see Contact.