Contact

There is no contact form here, because a form would mean collecting and storing your details. Email is simpler and you keep the copy.

Emailhello@astracalculator.com

What is worth writing about

A wrong number. The most useful message I can get. Tell me which calculator, what you entered and what you expected, and I will check the arithmetic and correct the page.

A calculator that does not exist yet. Requests decide what gets built next. Say what you were trying to work out.

A figure that is out of date. Bag yields and coverage rates change. If a product near you says something different from what a page assumes, that is worth knowing.

What I cannot help with

I cannot quote your job, recommend a contractor, or tell you whether your wall needs a permit. These are estimating tools, not engineering advice, and anything structural belongs with a professional who can see the site.

Replies usually take a few days. Corrections get answered first.