Multiply path or bed area in square feet by depth in feet and divide by 27 for cubic yards, then multiply by 1.35 for tons of pea gravel. A 20-ft garden path 3 ft wide at 2 inches deep needs about 0.37 cubic yards, or roughly 0.5 tons.
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Order – tons (includes your waste allowance) so compaction and spillage don’t leave you short.
Garden Stone Calculator Guide
Garden stone does two jobs: it surfaces the paths you walk and tops the beds you plant. The quantities are small compared with a driveway — a whole path often fits in half a ton — but the math is the same: area times depth in feet, divided by 27, times density. At pea gravel’s 1.35 tons per cubic yard, most garden projects land in the fraction-of-a-yard range where careful measuring saves a second trip to the supplier.
The trap in garden estimating is winding shapes. Break a curved path into straight segments, measure each along its centerline, multiply by the width, and sum. For irregular beds, pace out an enclosing rectangle and knock off a quarter — over-ordering slightly beats a bare patch mid-bed.
How Deep Should Garden Stone Go?
Depth depends on whether feet or plants live there. Coverage below is for pea gravel; one cubic yard covers 162 square feet at 2 inches, 108 square feet at 3 inches.
| Garden use | Depth | 1 yd³ covers | 1 ton covers |
|---|---|---|---|
| Bed topping around plants | 1–2 in | 162 sq ft at 2 in | 120 sq ft |
| Main garden path | 2–3 in | 108 sq ft at 3 in | 80 sq ft |
| Between stepping stones | 2 in | 162 sq ft | 120 sq ft |
| Vegetable garden aisles | 3 in | 108 sq ft | 80 sq ft |
| Seating nook | 2 in | 162 sq ft | 120 sq ft |
Around plantings, resist the urge to pile deeper “for fewer weeds” — 2 inches over fabric already blocks nearly all germination, and deeper stone holds heat against stems and buries crowns.
Building a Garden Path That Lasts
- Excavate 3–4 inches below finished grade, stripping all turf and roots.
- Lay fabric — woven geotextile keeps the gravel from pumping into soil in wet weather.
- Edge both sides before the stone goes in; loose gravel needs containment to hold a line.
- Fill and rake to a consistent 2–3 inches, slightly crowned so rain sheds sideways.
- Top up annually — paths lose a little material to shoes and wheelbarrows every season.
For a path punctuated with pavers, count the slabs first with the stepping stone calculator, then fill between them here. And if pea gravel is your material throughout, the pea gravel calculator covers its quirks — migration, edging, and bulk pricing — in detail.
Frequently Asked Questions
What is the best stone for garden paths?
Pea gravel and decomposed granite are the two favorites: pea gravel is soft underfoot and drains instantly, while decomposed granite compacts into a firmer, more formal surface. Both work at a 2–3 inch depth over a stripped, firm subgrade.
How deep should stone be in a garden bed?
A 1–2 inch topping is plenty around plantings — enough to suppress weeds and hold moisture without smothering roots. Save the 2–3 inch depths for surfaces you walk on.
How much does a ton of pea gravel cover in a garden?
At 1.35 tons per cubic yard, one ton of pea gravel covers about 120 square feet at 2 inches deep, or roughly 80 square feet at a 3-inch path depth. One cubic yard covers 162 square feet at 2 inches.
How do I keep garden stone out of the lawn?
Install edging — steel, aluminum, or a soldier course of brick — anywhere gravel meets grass. Set the gravel surface about a half inch below the edging lip so mower wheels and rain cannot push stones over the top.