Bags of Sand for a 8x18 Patio
How many bags of sand for a 8x18 patio: at 2 inches deep you need about 24.0 cubic feet, which is 48 bags of the common 0.5 cubic foot size. If your store sells sand in 50-pound bags instead, figure about 48 bags, since sand 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 | 12.0 | 24 | 24 |
| 2 in | 24.0 | 48 | 48 |
| 3 in | 36.0 | 72 | 72 |
| 4 in | 48.0 | 96 | 96 |
How to figure it
- Area: 8 × 18 = 144 sq ft.
- Volume: 144 × (2 ÷ 12) = 24.0 cu ft.
- Bags: 24.0 ÷ 0.5 = 48 bags (round up).
Bags or bulk?
A cubic yard is 27 cubic feet, so 24.0 cubic feet is 0.89 yards, about 1.2 tons. This is a small enough job that bags are reasonable, especially if a bulk delivery fee applies. Compare the bag price × 48 against a bulk quote for 1.3 tons delivered.
About sand
For paver bedding, concrete sand (coarse, washed) is the usual pick. Mason sand is finer and used in mortar and play areas.
Before you spread for a patio
- 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 sand
Good uses:
- Paver and flagstone bedding
- Leveling under above-ground pools (with the right product)
- Filling joints and backfilling pipe
Less suited to:
- Driveway bases, since sand shifts under load
- Steep areas exposed to runoff
- Thick layers under pavers, which settle unevenly
Quick reference numbers
- Per inch over 100 sq ft: about 0.42 tons of sand (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.2 tons.
- Another size for comparison: a 12x24 area at 3 inches takes about 3.6 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.
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- 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 bags of sand for a 8x18 patio?
About 48 bags of 0.5 cubic feet at 2 inches deep.
How many 50 lb bags of sand for 8x18?
About 48 bags at 2 inches.
How many 0.5 cubic foot bags are in a cubic yard?
54 bags.
How many cubic feet is a 8x18 patio at 2 inches?
About 24.0 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
- How Much Does a Ton of Sand Cover?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Ton of Gravel Cover? Depth Chart
- Bags of Sand for a 8x14 Patio
- Bags of Sand for a 8x16 Patio
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