Write to us
[email protected]Reporting a wrong result
Copy the address of the page as you have it and paste it into your message. The address holds your inputs, so we can repeat the calculation exactly and see what you saw. Tell us what you expected, and where that figure comes from if you know: a bag, a supplier’s quote, a data sheet.
What we cannot help with
We cannot size a beam, a footing or a slab, tell you whether a project meets your building code, or recommend a contractor. Your building department or an engineer can.
Updated . How we calculate.