Gravel calculator app: tons, yards and truckloads on your phone (2026)

Gravel is measured in cubic yards but sold by the ton, and that one conversion is where most driveway and path estimates go wrong. A gravel calculator app is worth having when it does that conversion with the right density for the stone you're actually buying, and tells you how many truckloads that is. Here's what to look for, the formula to check any app with, and the free options.

Short answer: on Android, our Gravel & Stone Calculator is free on Google Play: all of its calculators are free with ads, and one-time purchases remove ads or add contractor tools. On iPhone, a gravel calculator is part of Roofing Calculator & Estimator (version 1.7 and later). In a browser, use smartgravelcalculator.com.

What a good gravel calculator app should do

• Use a density per material. Pea gravel, #57 stone, crusher run, sand and river rock don't weigh the same. One "1.4 tons per yard" for everything can be off by a ton or more on a driveway.
• Add compaction only where it applies. Crusher run and decomposed granite pack down when rolled, so you need extra. Clean stone like #57 or pea gravel doesn't compact much.
• Give tons, cubic yards and truckloads together. Quarries quote in tons, landscape yards in yards, and delivery is per load.
• Handle shapes and layers. Circles for fire pits, trenches for French drains, and a driveway built as base plus top layer.
• Show the math. If you can see the density and depth it used, you can check it against your supplier's figures.
• Work offline. Quarries and job sites are not known for signal.

Gravel & Stone Calculator (Android): what's in it

From the app's Google Play listing (checked October 4, 2026):

• 42 calculators, all free: cubic yards, tons and truckloads from one area and depth, with the density row shown;
• its own density for pea gravel, #57 and #8 stone, crusher run, sand, river rock, limestone, decomposed granite, rip rap and boulders;
• compaction added for crusher run, #304 and decomposed granite, and not for raked stone, with the reason on screen;
• driveways, paths, patio and paver base, fire-pit rings, slopes, trenches, French drains, dry wells and swales;
• cost per ton or per yard, delivery, labor and markup; no account, works offline;
• free with ads; Remove Ads and Pro Contractor are one-time purchases, and there's no subscription.

The formula, with an example

1. Cubic feet = length × width × depth (in feet). A 10 × 40 ft path at 3 inches deep: 10 × 40 × 0.25 = 100 cu ft.
2. Cubic yards = cubic feet ÷ 27. 100 ÷ 27 = 3.7 cubic yards.
3. Tons = cubic yards × density. Pea gravel is about 1.4 tons per cubic yard: 3.7 × 1.4 ≈ 5.2 tons.
4. Pea gravel is raked, not rolled, so no compaction allowance. For crusher run, add roughly 15–25% for compaction.
5. Round up to what your supplier sells, and confirm their density figure: it varies by quarry and moisture.

For driveway depths, base layers and more worked examples, read how many tons of gravel do I need.

On iPhone

Roofing Calculator & Estimator on the App Store includes the gravel calculator together with deck, fence, drywall, insulation, tile and sod calculators. The full set of 42 gravel tools also runs in Safari at smartgravelcalculator.com.

Related projects

Laying sod next to the new path? See how much sod do I need. Building a deck on a gravel pad? See the deck calculator app guide.