About SlabCalc
Construction calculators that contractors actually trust.
Our Mission
SlabCalc exists because ordering the wrong amount of material is expensive — whether you're short on concrete mid-pour or stuck returning 30 extra bags of mulch. We build calculators that give you accurate quantities in seconds, so you can order with confidence and get back to building.
Every calculator on this site uses industry-standard formulas verified against manufacturer specifications and building trade references. We include waste factors because real projects aren't textbook perfect — uneven ground, saw cuts, and spillage happen.
Accurate Formulas
Industry-standard calculations with configurable waste factors. Every formula is unit-tested to prevent errors.
Instant Results
No page reloads, no sign-ups. Enter dimensions and get quantities immediately — on desktop or mobile.
No Hidden Agenda
We don't sell your data or require accounts. SlabCalc is free to use and supported by ads and affiliate links.
Built for the Job Site
Mobile-first design that works with gloves on. Large inputs, clear results, no clutter.
Who We Serve
SlabCalc is designed for DIY homeowners tackling weekend projects, contractors estimating material orders, and construction estimators who need a quick sanity check. Whether you're pouring a patio slab or estimating materials for a 200-foot fence line, our tools give you the numbers you need.
Methodology & Accuracy
Our calculators use formulas sourced from concrete industry standards (ACI, PCA), paint manufacturer coverage rates, and building material supplier specifications. All calculation logic is covered by automated unit tests to ensure accuracy. Estimates are intended as guidelines — always verify with your material supplier for project-specific conditions.
Get in Touch
Found a bug in a calculator? Have a suggestion for a new tool? We want to hear from you. Reach us at hello@slab-calc.com.