How Much Decomposed Granite for a 3x30 Walkway?
A 3 by 30 foot walkway is 90 square feet. How much decomposed granite for a 3x30 walkway depends on depth: at 3 inches it is about 0.83 cubic yards or 1.1 tons. Suppliers usually sell by the ton, so the tonnage is the number to give them.
Volume and tonnage calculator →The math for a 3x30 walkway
- Area: 3 × 30 = 90 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic feet: 90 × 0.250 = 22.5 cu ft.
- Cubic yards: ÷ 27 = 0.83 yd³.
- Tons: × 1.35 = 1.1 tons.
The volume and tonnage calculator does this for any size.
Decomposed granite needed by depth
| Depth | Cubic yards | Tons (approx.) | Tons +10% |
|---|---|---|---|
| 2 in | 0.56 | 0.8 | 0.8 |
| 3 in | 0.83 | 1.1 | 1.2 |
| 4 in | 1.11 | 1.5 | 1.7 |
About decomposed granite
DG should be laid in thin lifts, wetted and compacted. Loose DG at a deep depth stays soft and tracks onto shoes. Ask your supplier for their own tons-per-yard figure, since stone source and moisture shift it.
Preparing the walkway
Dig the path a few inches below grade, compact the bottom, add fabric if needed and install edging on both sides so the material stays on the walk. Since the walkway carries foot traffic, a little extra depth is cheap insurance.
Ordering tips
- Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
- Delivery size. 1.2 tons fits in a single typical dump truck load; small loads may carry a delivery fee. See how many tons of gravel in a dump truck.
- Bulk vs bags. At about 1.1 tons this job is small enough that bagged material could work; a 0.5 cubic foot bag holds about 1/54 of a yard, so compare the bag count with a bulk minimum.
- Where it drops. Have the truck dump as close to the walkway as firm ground allows.
When to choose decomposed granite
Best suited to:
- Garden paths and patios with a natural look
- Around trees and in xeriscape designs
- Stabilized DG for accessible paths
Think twice for:
- Steep grades without a stabilizer
- Areas right outside doors, since fines track in
- Driveways with heavy turning traffic
Quick reference numbers
- Per inch over 100 sq ft: about 0.42 tons of decomposed granite (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.2 tons.
- Another size for comparison: a 10x20 area at 3 inches takes about 2.5 tons.
- Weight used here: about 1.35 tons per cubic yard.
Common estimating mistakes
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
Questions people ask
How many tons of decomposed granite for a 3x30 walkway?
About 1.1 tons at 3 inches deep, or 1.2 tons with 10 percent extra.
How many cubic yards is a 3x30 walkway at 3 inches?
About 0.83 cubic yards.
How much does a cubic yard of decomposed granite weigh?
Usually around 1.25 to 1.45 tons, depending on stone size, fines and moisture.
How deep should decomposed granite be for a walkway?
The table above shows 2 to 4 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.
How many square feet is 3x30?
90 square feet.
Related guides
- Crushed Stone vs Gravel: Differences and Best Uses
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much Decomposed Granite for a 3x20 Walkway?
- How Much Decomposed Granite for a 3x25 Walkway?
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