About MaterialPal

Last reviewed: July 2026

MaterialPal builds simple, accurate and completely free material calculators for construction and DIY projects. Our goal is to help you order the right amount of concrete, gravel, mulch, soil, sand or pavers — without over-paying or running short — and to show you the math behind every number.

Who we are

MaterialPal is an independent site built and maintained by a small team with hands-on construction, landscaping and software experience. We build the calculators we wished existed when planning our own projects: fast, honest about their limits, and easy to sanity-check. We are not affiliated with any material supplier or brand.

Our mission

Material estimating is where a lot of projects go wrong: guess low and you make a second trip or ruin a pour; guess high and you pay for material you don’t use. We turn a tape-measure reading into an exact quantity — in cubic yards, tons and bags — with an interactive diagram so you can see that the estimate matches your project.

How we build

• Accurate: we use standard volume math (27 cubic feet per cubic yard) and published supplier yields for bags and bulk material, and we show the formula on every page.
• Visual: each tool draws a scaled diagram that updates as you type, so you can sanity-check the shape and size before ordering.
• Private & free: all calculations run in your browser. We don’t collect the numbers you enter, and there’s no sign-up or paywall.

Methodology & sources

Bag yields (for example ~0.60 cu ft per 80 lb bag of concrete) follow manufacturer data from suppliers such as QUIKRETE and Sakrete. Bulk densities (tons per cubic yard for gravel, sand, topsoil and mulch) are typical mid-range values; actual weight varies with moisture, product and compaction, so we always recommend a waste allowance and confirming with your supplier.

Editorial standards

Every calculator is built from documented formulas and cross-checked against worked examples before it goes live. We keep our figures current by:

• citing the supplier specs and standards we rely on (see sources above) so you can verify them;
• reviewing bag yields and material densities periodically and when a manufacturer updates their data;
• correcting any reported error quickly — if a number looks off, tell us and we will investigate and update the page;
• dating each policy and reference page so you can see when it was last reviewed.

A note on estimates

Our calculators are planning tools, not a substitute for professional advice or local building codes. For structural work, permits or anything load-bearing, consult a licensed contractor or engineer. See our disclaimer for details.

Contact

Found a bug, or want a calculator we haven’t built yet? Reach us on our contact page — we’d love to hear from you.