Gravel Path Calculator

About the Gravel Path Calculator

The Gravel Path Calculator estimates how much crushed stone or pea gravel is needed to fill a walkway or garden path to a chosen depth. It converts a simple length, width, and depth into both a volume figure (cubic yards, the unit most gravel yards sell by) and an approximate weight in tons, so you can order the right amount before the truck shows up.

How It Works

You enter the path's length and width in feet and the desired gravel depth in inches. The calculator converts depth to feet, multiplies length by width by depth to get cubic feet, divides by 27 to convert to cubic yards, and then multiplies the cubic yard figure by 1.4 to estimate the weight in tons.

volume (cu ft) = length x width x (depth in inches / 12); volume (cu yd) = volume (cu ft) / 27; weight (tons) = volume (cu yd) x 1.4

Formula & Methodology

Work it by hand in three steps. First find the footprint area in square feet by multiplying path length by path width. Second, convert your target depth from inches to feet by dividing by 12, then multiply that by the area to get cubic feet of gravel. Third, divide cubic feet by 27 (since one cubic yard equals 27 cubic feet) to get cubic yards, and multiply that number by 1.4 to get an approximate weight in tons, which is a common rule-of-thumb density for compacted gravel.

Examples

40-foot path, standard depth

For a 40 ft long, 3 ft wide path at the calculator's default 2-inch depth: volume is 40 x 3 x (2/12) = 20 cu ft, or 20 / 27 = 0.74 cu yd, weighing about 0.74 x 1.4 = 1.04 tons.

Wider path with a deeper base

A 60 ft by 4 ft path filled 4 inches deep works out to 60 x 4 x (4/12) = 80 cu ft, or 80 / 27 = 2.96 cu yd, roughly 2.96 x 1.4 = 4.15 tons of gravel.

Advantages

Converts a simple footprint and depth measurement directly into the cubic yard and ton figures gravel suppliers actually quote and bill by.
Removes the manual unit conversion between inches, feet, and cubic yards, which is where hand calculations most often go wrong.
Gives both a volume and a weight estimate in one pass, useful whether your supplier sells gravel by the yard or by the ton.

Common Mistakes

Forgetting to convert the gravel depth from inches to feet before multiplying, which inflates the volume estimate by a factor of 12.
Measuring only the finished top layer of gravel and ignoring that a compacted sub-base underneath needs its own separate volume calculation.
Ordering exactly the calculated amount with no buffer for settling, spillage, or an uneven sub-grade that eats up extra material during spreading.

Edge Cases to Watch For

The 1.4 tons-per-cubic-yard conversion is a general average - actual gravel density varies by material type (pea gravel, crushed limestone, river rock) and how compacted it is, so heavier or lighter stone will shift the real weight somewhat.
The calculator does not separate a compacted base layer from a decorative top layer; if you plan a two-layer path, run the calculator once per layer with each layer's own depth and add the results.
Very thin depths (under an inch) or very short paths can produce fractional cubic yard results that are hard to order from a supplier who sells by the full yard or by the bag, so round up to the nearest practical order size.

Common Use Cases

Homeowners planning a DIY garden path or walkway who need a gravel order quantity before visiting a landscaping supplier.
Landscapers quoting a gravel path project who want a quick volume and tonnage figure to include in a materials estimate.
DIYers comparing gravel costs across depths or widths before finalizing a path design.

Frequently asked questions

Should a gravel path have a base layer under the top gravel?

For a durable, well-draining path, yes - a compacted base layer of larger crushed stone (typically a few inches) topped with a thinner layer of finer decorative gravel resists rutting and weed growth far better than a single layer of gravel poured directly onto bare soil, which tends to sink and mix with mud over time.