Geometry Tool

Concrete Volume Calculator

Estimate the amount of concrete needed for slabs, footings, and columns in cubic yards and bags.

Σ The Formula

Volume = L × W × T

Real World Examples

Driveway
20ft x 10ft at 4in thick → 2.47 cubic yards
Small Patio
10ft x 10ft at 4in thick → 45 bags (80lb)

# About This Calculator

Whether you're pouring a new driveway or setting fence posts, knowing the exact Concrete Volume is crucial for cost estimation and avoiding project delays.

Concrete is typically sold by the Cubic Yard (27 cubic feet). For smaller DIY projects, it is sold in pre-mixed bags (usually 40lb, 60lb, or 80lb). This tool calculates based on the standard 80lb bag, which yields approximately 0.6 cubic feet of wet concrete.

How To Use

  1. Select the shape of your project (currently optimized for **Slabs**).
  2. Enter the **Length** and **Width** in feet.
  3. Enter the **Thickness** in inches (4 inches is standard for walkways).
  4. Enter the **Quantity** of similar slabs you are pouring.
  5. The result will show the volume in cubic yards and the number of 80lb bags required.

Frequently Asked Questions

How much 'waste' should I account for?+

It is standard practice to order 10% more concrete than your calculation to account for spillage, variation in subgrade depth, and form movement.

How many bags are in a yard?+

It takes approximately 45 bags of 80lb pre-mix to make one cubic yard of concrete.

Is Concrete Volume Calculator free to use?+

Yes, Concrete Volume Calculator on Matheric is completely free to use. We believe in accessible education and utility for everyone.

How accurate is Concrete Volume Calculator?+

We use standard mathematical formulas and high-precision computing algorithms to ensure results for Concrete Volume Calculator are accurate for academic and professional use.

Can I use Concrete Volume Calculator on my phone?+

Yes! Concrete Volume Calculator is fully responsive and optimized for all devices, including smartphones, tablets, and desktops.

Do you save my data?+

No. We prioritize your privacy. All calculations are performed in your browser or temporarily processed, and we do not store your personal input data.

About

Whether you're pouring a new driveway or setting fence posts, knowing the exact Concrete Volume is crucial for cost estimation and avoiding project delays.

Concrete is typically sold by the Cubic Yard (27 cubic feet). For smaller DIY projects, it is sold in pre-mixed bags (usually 40lb, 60lb, or 80lb). This tool calculates based on the standard 80lb bag, which yields approximately 0.6 cubic feet of wet concrete.

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