Concrete Slab Calculator

Cubic yards of concrete for slabs, sidewalks, or driveways.

CUBIC YARDS
cu yd
concrete volume

Usage Tip

Thickness is the most common measurement mistake. Residential slabs are typically 4 inches.

THE MATH
Volume = L × W × (T ÷ 12)
Where: cubic feet ÷ 27 = cubic yards
• Add 5–10% waste for most pours
• 60-lb bag = 0.45 ft³ of concrete
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.