Cubic Yards Explained
A cubic yard is a volume unit equal to 27 cubic feet, commonly used for concrete, gravel, and mulch orders in the US.
Quick answer
1 cubic yard (yd³) = 27 cubic feet (ft³). Volume = length × width × depth in feet, divided by 27. Suppliers quote concrete, topsoil, gravel, and mulch by cubic yard in the US. Material weight in tons requires density per material—volume conversion alone is not weight.
Overview
Construction and landscaping orders sound opaque until cubic yard volume clicks. Ready-mix concrete trucks measure in cubic yards; dump trucks for gravel do too, while weight limits on bridges use tons. Homeowners calculate patio slab volume in feet then divide by 27 to speak supplier language. Mistaking cubic yards for square yards—area not volume—or forgetting to convert inches of depth to feet before multiplying causes under-ordering that halts pours or over-ordering that wastes delivery minimum fees.
What a cubic yard represents
A cubic yard is the volume of a cube three feet long on each side: 3 ft × 3 ft × 3 ft = 27 ft³. It is imperial/US customary volume for bulk materials, not to be confused with square yards (area) or linear yards of fabric.
Metric counterpart is cubic meter (m³): 1 m³ ≈ 1.308 yd³. International projects may spec m³ while US suppliers bill yd³—convert at contract stage.
Calculating cubic yards from dimensions
Measure length, width, depth in feet. Multiply for ft³. Divide by 27 for yd³. Example: 12 ft × 20 ft × 0.33 ft (4 in) = 79.2 ft³ ÷ 27 ≈ 2.93 yd³ concrete.
Irregular shapes divide into rectangles or use average width/depth with conservative waste factor 5–10% for uneven subgrade and spillage.
Concrete, gravel, mulch, and topsoil
Concrete ready-mix ordered by yd³ with minimum load charges. Gravel and crushed stone convert yd³ to tons using material bulk density—granite differs from limestone. Mulch yd³ is lighter tons per yard than gravel.
Topsoil compacts after rain—some suppliers sell ‘fluffed’ vs compacted yardage; clarify moisture and compaction assumptions on quote.
Volume to weight: cubic yards to tons
Tons = cubic yards × density (tons per cubic yard). Aggregate might approximate 1.4–1.6 tons/yd³ depending on material and moisture; mulch far less.
Weight limits on residential driveways and truck axles constrain tonnage even when volume fits visually—check both yd³ order and estimated tons with supplier.
Avoiding costly measurement errors
Convert depth inches to feet before multiply—4 inches = 0.333 ft, not 4 ft. Double-check units on calculator inputs when switching between meters and feet mid-project.
Order slightly above calculated yardage with documented waste policy rather than risking cold joint on concrete pour from short load.
Examples
Driveway gravel 8 ft × 40 ft × 0.25 ft
80 ft³ ÷ 27 ≈ 2.96 yd³; at 1.5 tons/yd³ ≈ 4.4 tons for delivery planning.
Mulch beds 600 ft² at 3 in depth
600 × 0.25 = 150 ft³ ÷ 27 ≈ 5.6 yd³ mulch volume before compaction settle allowance.
Common mistakes and edge cases
- Using square footage as cubic yards without depth.
- Leaving depth in inches unconverted to feet.
- Assuming one ton conversion factor for all materials.
- Confusing cubic yards with linear yards of truck bed length.
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Last reviewed: 2026-05-23