Bags of Decomposed Granite for a 3x25 Walkway
How many bags of decomposed granite for a 3x25 walkway: at 3 inches deep you need about 18.8 cubic feet, which is 38 bags of the common 0.5 cubic foot size. If your store sells decomposed granite in 50-pound bags instead, figure about 38 bags, since decomposed granite weighs roughly 100 pounds per cubic foot.
Volume and tonnage calculator →Bag count by depth
| Depth | Cubic feet | 0.5 cu ft bags | 50 lb bags (approx.) |
|---|---|---|---|
| 1 in | 6.2 | 13 | 13 |
| 2 in | 12.5 | 25 | 25 |
| 3 in | 18.8 | 38 | 38 |
| 4 in | 25.0 | 50 | 50 |
How to figure it
- Area: 3 × 25 = 75 sq ft.
- Volume: 75 × (3 ÷ 12) = 18.8 cu ft.
- Bags: 18.8 ÷ 0.5 = 38 bags (round up).
Bags or bulk?
A cubic yard is 27 cubic feet, so 18.8 cubic feet is 0.69 yards, about 0.9 tons. Under a yard, bags save a delivery fee and are easy to haul in a car or pickup. Compare the bag price × 38 against a bulk quote for 1.0 tons delivered.
About decomposed granite
Decomposed granite (DG) is weathered granite broken into small particles and fines. It packs into a firm, natural-looking path surface, and stabilized versions include a binder.
Laying it down for a walkway
- Dig and level. Remove sod and set the base slightly below the surrounding grade.
- Edge it. Steel, plastic or stone edging keeps material in place.
- Spread in layers. Rake to depth, then tamp or wet and compact.
- Buy a few extra. Grab 5 to 10 percent more bags for settling and touch-ups.
The volume and tonnage calculator handles other sizes and depths.
Good and poor uses for decomposed granite
Works well for:
- Garden paths and patios with a natural look
- Around trees and in xeriscape designs
- Stabilized DG for accessible paths
Less suited to:
- 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 20x25 area at 3 inches takes about 6.3 tons.
- Weight used here: about 1.35 tons per cubic yard.
Where estimates go wrong
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
Questions people ask
How many bags of decomposed granite for a 3x25 walkway?
About 38 bags of 0.5 cubic feet at 3 inches deep.
How many 50 lb bags of decomposed granite for 3x25?
About 38 bags at 3 inches.
How many 0.5 cubic foot bags are in a cubic yard?
54 bags.
How many cubic feet is a 3x25 walkway at 3 inches?
About 18.8 cubic feet.
When does bulk make more sense?
Usually once the job passes about a cubic yard, or when you would need more than a few car trips.
Related guides
- Crushed Stone vs Gravel: Differences and Best Uses
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Ton of Gravel Cover? Depth Chart
- Bags of Decomposed Granite for a 3x15 Walkway
- Bags of Decomposed Granite for a 3x20 Walkway
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