About SupplyCalc

What SupplyCalc does

Every calculator on SupplyCalc takes a project measurement — length, width, depth, radius, sheet coverage — and returns a planning estimate for the matching material: concrete bags or yards, mulch bags or cubic yards, drywall sheets, paint gallons, tile boxes. Each estimate includes a waste factor, a material cost range, and an optional labor estimate. Every result can be printed, copied, or exported so it travels with you to the store.

What SupplyCalc deliberately is not

SupplyCalc is not a contractor bid, a structural calculation, a code reference, or a substitute for a local pro on a complicated job. Estimates assume clean rectangular forms, common bag yields, and conservative waste factors. They are a starting point, not a guarantee. Real jobs have soil conditions, code requirements, reinforcement choices, and access constraints that a calculator cannot see.

How the site is built

The site is a static Astro build hosted on Cloudflare Pages. Calculators run entirely in the browser; no measurements, projects, or saved reports leave your device. Every calculator and guide cites its sources, lists last-updated dates, and is gated by an automated quality check before it appears in the sitemap or the navigation. The full estimating logic, unit conversions, and material reference tables live in the project repository.

Editorial standards

SupplyCalc content is reviewed by SupplyCalc Editorial — a small team that writes, fact-checks, and updates each page. Every indexable page passes an internal quality gate: at least 800 words of original content, one or more citations to recognized industry sources (Portland Cement Association, Gypsum Association, Tile Council of North America, university extension services, EPA), a reference table, five or more FAQ entries, a related-calculator block, and a visible last-updated date. Pages that fall below the bar stay out of the sitemap until they meet it. See the methodology page for the exact rules.

Monetization

SupplyCalc may include affiliate links to retailer product pages (Home Depot, Lowe's, Amazon) and may display a small number of ads. All affiliate links carry the required disclosure and use the standard sponsored/nofollow attributes. Calculator results, ranges, citations, and assumptions are never influenced by which retailer pays the highest commission. If a feature would compromise estimate quality, it stays off.

FAQ

Who is SupplyCalc for?

DIY homeowners planning a small renovation, weekend remodelers, and small contractors who need a quick second opinion before placing a material order.

Is the data accurate?

The math is exact for the inputs you give it. The realism of the answer depends on how accurately you measured, how conservative your waste factor is, and how typical the bag yield or sheet coverage of the product you actually buy is. Use SupplyCalc as a planning estimate and confirm against the actual product label before purchasing.

Do you store my project data?

No. Saved estimates live in your browser's local storage. Nothing is sent to a server. There is no account, no sign-in, and no tracking of project measurements.

How often are calculators updated?

Each calculator and guide carries a visible last-updated date. SupplyCalc Editorial reviews pages whenever a referenced standard changes, when retail bag yields or sheet sizes shift, or at least once per year.

How can I report a bug or suggest a new calculator?

Use the contact page to send feedback. New calculator requests and corrections are reviewed weekly.