About App Guidebook

Our Mission

App Guidebook was built to make construction math accessible to everyone — from professional contractors needing quick job-site estimates to weekend DIYers tackling their first project.

We believe that accurate calculations shouldn't require expensive software or specialized training. Every tool and guide on this site is available without registration — no paywalls, no hidden fees.

Our Team

Our content is created and reviewed by a team of experienced construction professionals, engineers, and DIY enthusiasts. We combine hands-on field experience with industry-standard formulas from the American Concrete Institute (ACI), ASTM International, and other recognized authorities.

Every calculator on this site uses real engineering formulas — not approximations. Our guides are written based on actual job site experience, covering not just the textbook methods but the practical tips and common mistakes that only come from doing the work.

Our Methodology

All calculators on App Guidebook are built using industry-standard formulas referenced from:

• ACI (American Concrete Institute) standards for concrete calculations
• ASTM International guidelines for construction materials
• IRC (International Residential Code) for building practices
• Published manufacturer specifications for material coverage rates

Our guides are researched using a combination of manufacturer technical documents, trade publications, and hands-on field experience. We regularly review and update content to reflect current building codes and material costs.