Free River Rock Calculator Widget
The embedded River Rock Calculator turns a bed's length and width and the rock size into tons, cubic yards, a 0.5 cu ft bag count, landscape fabric and a bulk-vs-bagged cost, for river rock from 3/4 in to 5 in, pea gravel, Mexican beach pebbles or lava rock. It fills in the right depth for the rock size. It fits landscape supply yards, garden centres and landscaping or xeriscaping sites.
It's a single iframe plus a one-line credit link — free, responsive, no registration, and no ads or tracking scripts on your page.
Live preview
The embed adds no ads and no tracking to your page. Prefer a guided version with a preview? Use the embed builder.
Credit line included
The code ends with a one-line credit under the calculator: “River Rock Calculator by Build Material Planner”, linking to the full calculator. Please keep it. It's what keeps these calculators free to build and maintain, and it helps other people find them.
Why add it to your page
Rock is sold by the ton but measured by the yard, and the right depth depends on the stone size, so readers often over- or under-order. The calculator handles both conversions, sets the depth for the rock and says when bulk beats bags, so a reader orders once.
What your visitors get
A 50 x 3 ft foundation border in 1 to 3 in river rock, with landscape fabric comes back as:
- River Rock, 1 to 3 in (bulk): 1.96 tons
- River Rock, 1 to 3 in (bagged, 0.5 cu ft each): 83 bags
- Landscape fabric (weed barrier): 165 sq ft
- Bulk rock + fabric (before delivery): $209 – $343
Where the River Rock Calculator widget fits
- A landscape supply yard's decorative rock or delivery page
- A river rock, dry creek bed or xeriscaping how-to article
- A "how much rock do I need" guide or product page
How to add it to your site
Copy the code above and paste it where the calculator should appear. See the install notes for WordPress, Squarespace, Wix and Webflow, plus sizing and common questions.
Questions from site owners
Does it give tons or cubic yards?
Both. Rock is usually sold by the ton, so the result leads with tons and shows cubic yards beside it.
Does it set the depth for the rock size?
Yes. If the reader leaves depth blank, it uses about 2 in for small rock, 3 in for 1 to 3 in rock and 5 in for 3 to 5 in rock, and warns when a depth is too thin to cover the ground.
Does it include landscape fabric?
Yes, optionally: the fabric area with extra for overlapping seams, and its cost.
Just need to run the numbers yourself? Use the full River Rock Calculator — it has the formulas, a worked example and an FAQ. Also for your readers: Gravel Driveway Calculator widget, Mulch & Landscape Material Calculator widget. Or see all embeddable calculators.