How Much Sand Do I Need? Formula, Depths & Worked Examples

Planning estimate — the bag governs on small jobs, the yard on big ones. Sand is ordered by volume and paid for by weight, so this guide gives you both, then run your area through our sand calculator.

The formula

Cubic feet = length × width × depth in feet. Cubic yards = cubic feet ÷ 27. Tons = cubic yards × 1.35 (dry sand, about 2,700 lb per cubic yard). A 10×10 ft area at 1 inch deep: 100 × (1 ÷ 12) = 8.33 cu ft = 0.31 cu yd = 0.42 tons. With 10% waste that is 0.34 cu yd, or 19 bags of 50 lb sand (each bag about 0.5 cu ft).

Depth by project

Paver bedding: spread about 1.2 inches loose so it compacts to 1 inch finished (ICPI guidance), and allow 15–25% extra for compaction. Sandbox: 6–12 inches of washed play sand. Lawn leveling: 1/4–1/2 inch per pass, in multiple light passes rather than one thick one. Pool base / leveling layer: typically 2–4 inches, compacted. The depth is the whole estimate — measure it, do not guess it, because doubling the depth doubles the order.

Which sand for which job

Concrete / sharp sand for paver bases and bedding — it locks together under compaction. Washed play sand for sandboxes — clean, silica-screened, and safe for children. Masonry sand for mortar mixes. Fill sand for bulk leveling where appearance does not matter. The weight per yard is similar across types, but the wrong type fails the job: play sand under pavers shifts, and sharp sand in a sandbox is not child-safe.

Bagged vs bulk

A 50 lb bag is about 0.5 cu ft, so a cubic yard is about 54 bags. Below about 20 bags, bagged is convenient and the delivery fee for bulk is not worth it. Above that, bulk by the cubic yard is almost always cheaper and far less hauling. A standard pickup truck safely carries about 1 cubic yard of sand — and wet sand weighs 20–30% more than dry, so check the payload before hauling a full yard of wet material.

Worked examples

1. 10×10 ft paver base, 1 in: 8.33 cu ft = 0.31 cu yd = 0.42 tons; with 20% compaction allowance, 0.37 cu yd, or 20 bags of 50 lb.
2. 4×4 ft sandbox, 8 in: 10.67 cu ft = 0.40 cu yd = 0.53 tons; about 22 bags of 50 lb play sand.
3. 1,000 sq ft lawn, 1/2 in top-dressing: 41.67 cu ft = 1.54 cu yd = 2.08 tons; with 10% waste, 1.70 cu yd.

Common mistakes

Three errors cover most sand shortages: entering the depth in feet instead of inches (a 12× error), skipping the compaction allowance on paver bases, and ordering by tons for a small job where bags are the unit — 0.42 tons sounds small, but it is 19 bags to haul.

Frequently asked questions

The rest of the groundwork

Sand usually sits next to stone — the gravel calculator covers base and drainage stone, and the paver calculator counts the pavers that go on top of the sand.