How many cubic yards of concrete do I need for a 10x10 slab?

A 10x10 slab at 4 inches thick requires 1.23 cubic yards (33.3 cubic feet). With 10% waste, order about 1.35 cubic yards. The calculation is: (10 × 10 × 0.33) ÷ 27 = 1.23 cubic yards.

What's the difference between cubic feet and cubic yards?

There are 27 cubic feet in 1 cubic yard. Concrete is typically sold by the cubic yard in the US, while measurements are often in cubic feet. This calculator shows both units for easy ordering and comparison.

How many 80lb bags of concrete make a cubic yard?

Approximately 45-50 bags of 80lb premix concrete equal one cubic yard, depending on the brand and exact yield. Most 80lb bags yield about 0.60 cubic feet, so 45 bags × 0.60 ft³ = 27 ft³ (1 cubic yard).

Should I use a higher waste percentage for my project?

Add 5-10% waste for straightforward rectangular pours on level ground. Use 10-15% waste for complex shapes, uneven terrain, or when using forms. Hot weather, multiple pours, or pattern matching may require even higher waste allowances.

When should I choose ready-mix concrete over premix bags?

Ready-mix is more economical for projects over 1 cubic yard and provides consistent quality. Premix bags work well for small projects, touch-ups, or locations where ready-mix delivery isn't practical. Compare total costs including delivery fees.

Can I use this calculator for commercial concrete projects?

Yes, but commercial projects often have different specifications including higher strength requirements, different aggregate sizes, and specialized additives. Consult with a structural engineer or concrete supplier for large commercial applications.

Concrete Slab Calculator

Determine the number of 60lb or 80lb premix concrete bags and total cubic yards needed for slabs, patios, and footings. Includes waste percentage for more accurate ordering.

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Common Concrete Projects

Popular project sizes for quick estimation

Project Details & Dimensions

Choose project type and enter measurements

Length (ft)

Waste / Overage (%)

Width (ft)

Thickness (in)

How it works: Slab calculates volume from length, width, and thickness. Footing calculates a linear foundation. Waste percentage accounts for overages, spillage, and testing.

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