How to Calculate Gravel Needed for a Project
Area × depth, adjusted for the specific material's density
Volume first: area × depth
Like a concrete slab, gravel volume starts with area (length × width) times depth, converted to cubic feet or cubic yards. Depth for gravel projects varies widely by use — a thin decorative topping might be 1-2 inches, while a structural base layer can be 4-6 inches or more.
Converting volume to weight
Gravel suppliers commonly sell and deliver by the ton rather than the cubic yard. Converting requires the material's density, which varies by gravel type — a general rule of thumb often cited is roughly 1.4-1.5 tons per cubic yard for typical crushed gravel, but this varies enough by specific material that checking with your supplier is more reliable than assuming a fixed figure.
Compaction
Gravel compacts when installed and compacted with a plate compactor, meaning delivered (loose) volume needs to somewhat exceed the finished, compacted volume you're trying to achieve. This is a separate consideration from the waste allowance and depends on the specific material's compaction characteristics.
Worked Example
A 10 ft × 50 ft path, 3 inches deep, material at ~1.4 tons/yd³.
Volume: 10 × 50 × (3/12) = 125 ft³ = 4.63 yd³
Weight: 4.63 × 1.4 ≈ 6.5 tons
Related Calculators
Related Guides
From the Blog
Sources
NIST SP 811
Unit conversion reference (cubic feet, cubic yards, cubic metres).
NIST SP 811 — reference