Concrete & Gravel Calculators | Coal Creek Excavation

Quick material estimates for planning. Results are estimates only — actual quantities depend on site conditions, forming, subgrade and compaction. Call (303) 859-9513 to confirm before you order.

Concrete flatwork / slab

Length (ft)Width (ft)Thickness (in)Waste %

CY = L × W × (T ÷ 12) ÷ 27 × (1 + waste%)

Footings / foundation walls

Total length (ft)Width / thickness (in)Height / depth (in)Waste %

CY = L × (W ÷ 12) × (H ÷ 12) ÷ 27 × (1 + waste%)

Frost walls (wall + footing)

Linear feetWall height (in)Wall thickness (in)Footing width (in)Footing depth (in)Waste %

CY = L × [(H × T) + (FW × FD)] ÷ 144 ÷ 27 × (1 + waste%)

Round columns / piers

Diameter (in)Depth / height (ft)QuantityWaste %

CY = π × (D ÷ 24)² × H × Qty ÷ 27 × (1 + waste%)

Gravel / aggregate

Length (ft)Width (ft)Depth (in)Material

CY = L × W × (T ÷ 12) ÷ 27 · Tons = CY × density (typical compacted values; varies by source)

Order from Wild Bill’s Recycled Aggregates

Fill dirt / topsoil

Length (ft)Width (ft)Depth (in)Compaction / settling allowance %

CY = L × W × (T ÷ 12) ÷ 27 × (1 + allowance%)