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.

concrete

slab

footing

Share this tool:

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.

Continue Your Calculators Journey

More tools you might find useful

Asphalt Calculator

Calculate asphalt tons for driveways and parking lots

Gravel Calculator

Estimate gravel needed for driveways and landscaping

Mulch Calculator

Estimate mulch needed for garden beds

Drywall Calculator

Calculate drywall sheets for walls and ceilings

🌈 Browse More Tools

All Calculator Tools All Tools

Complete Guide: Concrete Slab Calculator

Everything you need to know about using Concrete Slab Calculator effectively

Related Tools

More tools you might find useful

Featured

Salary Tax Calculator

Determine take-home pay after taxes

Calculate density, mass, or volume with material references

density

mass

volume

Trapezoid Area Calculator

Calculate trapezoid area with multiple methods

trapezoid

area

perimeter

Boiler Pressure Calculator

Convert boiler and steam pressure readings safely

boiler

steam

pressure

Cylinder Volume Calculator

Calculate cylinder volume, surface area, and dimensions

cylinder

volume

surface-area

Sphere Volume Calculator

Calculate sphere volume, surface area, and diameter

sphere

volume

surface-area

Cube Volume Calculator

Calculate cube volume, surface area, and space diagonal

Solve linear, quadratic, and systems of equations

equation

solver

linear

Related Collections

Collections that include this tool - discover more tools in these curated collections

Material Quantity Calculators for Home Projects

Calculate exact materials needed for home improvement projects. Get precise quantities for paint, tile, concrete, carpet, wallpaper, and mulch to avoid waste and overspending.

View collection