About MaterialCalculate

Why we built this

Most material calculators online fail in one of two ways. Some oversimplify the maths until the answer is barely trustworthy: one input, one number, no idea what assumptions went into it. Others are so cluttered that finding the actual result feels like work. Neither helps the person standing in a builders’ merchant, phone in hand, trying to decide how many bags to load onto the trolley.

We wanted the opposite. A tool that gives you the number fast, shows its working, and then answers the questions that come after the volume. How much will it weigh? Will it fit in the truck? How many bags is that, and is the 80 lb bag actually cheaper than the 60? Should you be ordering ready-mix instead of mixing by hand? Those are the decisions that cost real money on a real job.

So we built ours to be fast, accurate and honest about its assumptions, and we made every calculator free to use.

Who we are

Every calculator and guide on the site is researched, built and tested in-house rather than embedded from a third party. Each tool is checked against hand-worked examples before it goes live and corrected when a reader reports a problem, and every calculator page shows a worked example so you can see exactly how the result was reached.

How we build our calculators

Accuracy is not a marketing word for us. It is the whole product, because a wrong number makes the tool worthless. Every calculator on this site follows the same principles:

• The geometry is exact, the assumptions are statedEvery tool lists what it assumes, such as bag yields, material densities and standard depths, so you can adjust when your product or your site differs from the defaults.
• Checked against industry referencesOur formulas and figures are cross-checked against standard construction references, and updated as material densities, bag sizes and industry defaults change.
• Cost, weight and quantity togetherVolume alone rarely answers the real question. You also need to know what it weighs, how you will move it and what it will cost.
• Waste and rounding built inEvery tool adds a waste allowance and rounds to the increment suppliers actually sell: quarter yards, whole bags, full pallets.
• Nothing leaves your browserEvery calculation runs on your own device. Nothing you type into a calculator is sent to a server or stored.
• Built for phonesThe tools are designed mobile-first, because that is where they get used: on the job site and in the store aisle, not at a desk.

What we cover

We started with concrete, the material people most often need to estimate and most often get wrong. The library has since grown to 195+ calculators, with new ones added every week:

• Concrete and masonrySlabs, footings, columns, stairs, bag counts, brick, block, pavers and stone veneer. See the concrete tools and masonry tools.
• Aggregates, soil and lawnGravel, sand, crushed stone, topsoil, mulch, sod and seed, sized by cubic yards, tons or bags. See the aggregate tools and soil and mulch tools.
• Earthwork, drainage and waterCut and fill, grading, culverts, French drains, irrigation and pond volume. See the earthwork tools.
• Building and outdoor projectsFencing, decking, roofing, siding, framing lumber, outdoor structures and interior finishes. See the deck tools, roofing tools and framing tools.

You can always see the full line-up on the tools page.

How the site is funded

MaterialCalculate is free to use and supported by advertising. Ads never change a calculator’s result, and we place them so they do not cover the tool or the answer you came for.

We do not accept payment to recommend a product or change a figure. You can read how ads and cookies work on this site in our Privacy Policy.

A word on accuracy

Our calculators are built to be as accurate as the inputs allow, but every estimate is a planning figure, not a guarantee. Material densities shift with moisture, bag yields differ slightly between manufacturers, and no site is ever perfectly level or perfectly square.

We build in a waste allowance for exactly that reason. Still, always confirm final quantities with your supplier before ordering, and consult a qualified professional or engineer for anything structural or load-bearing. Our full disclaimer is in the Terms of Use.

Get in touch

Spotted something wrong? Want a calculator we have not built yet? We want to hear it, because corrections and requests are how this site gets better. Contact us here.