Concrete Volume Calculation for 10×10 Patio at 4-Inch Depth

A homeowner needs to calculate cubic yards of concrete for a 10×10 foot patio at 4-inch depth, unsure of the square-feet-per-cubic-yard conversion.

Step-by-Step Calculation

1. Convert depth to feet: 4 inches = 4/12 = 0.333 feet
2. Calculate cubic feet: 10 ft × 10 ft × 0.333 ft = 33.3 cubic feet
3. Convert to cubic yards: 1 cubic yard = 27 cubic feet
4. Divide: 33.3 ÷ 27 = 1.23 cubic yards

Practical Ordering

• Add 10% waste factor: 1.23 × 1.10 = 1.35 cubic yards
• Order 1.5 cubic yards (suppliers typically sell in 0.5-yard increments)
• Verify with online calculator: Concrete Network Volume Calculator

General Formula

Cubic yards = (Length ft × Width ft × Depth inches) ÷ 324

Example: (10 × 10 × 4) ÷ 324 = 1.23 cubic yards

Depth Reference (10×10 slab)

• 3 inches = 0.93 cubic yards
• 4 inches = 1.23 cubic yards
• 5 inches = 1.54 cubic yards
• 6 inches = 1.85 cubic yards