About renovatemath

What this site is

renovatemath is a collection of free construction calculators — concrete, lumber, paint, tile, mulch, gravel and more — built for DIY homeowners who want quick, reliable answers before they buy materials or start a project.

No accounts. No forms. No paywalls. You open a calculator, enter your dimensions, and get an answer in seconds.

How we keep the math honest

Every calculator on this site follows three rules:

• Standard formulas. Each tool implements the industry-standard way of calculating the quantity (for example, one cubic yard = 27 cubic feet, or 16×8 in blocks cover 0.89 sq ft each).
• Validated constants. Material yields, coverage rates and other constants are checked against published sources — manufacturers' official calculators, cooperative extension guides and engineering references. Every calculator page lists its sources, and constants we have not yet confirmed are flagged as pending.
• Automated tests. Each calculator's math is locked by automated tests, so a fix to one tool can never silently break another.

Who is behind it

renovatemath is an independent, one-person project. It is not affiliated with any material manufacturer, retailer or trade association. The site is monetized with advertising so the tools stay free.

When to ask a professional

Calculators give you estimates — they do not replace engineering judgment, local building codes or the advice of a licensed contractor. For structural work, always have your plans reviewed by a professional. See our disclaimer for details.