Contact

There is no account and no ticket system. Email is enough.

For a wrong result, a missing unit, or a calculator you want next, email hello@buildmathhq.com. Include the page URL. Calculator links store length, width, depth and the other inputs in the query string, so we can replay the same job.

Press or corrections go to the same address. If the math is wrong we add a failing test before we change the formula.

What we cannot do by email

We cannot take off a job from photos, pick a stone size for your soil, or write a supplier quote. The numbers on the site are planning estimates. Confirm them with the yard or the installer before you buy. See the terms for that limit in writing.