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Concrete Calculator

Estimate rectangular concrete volume in cubic feet and cubic yards from dimensions.

Concrete Calculator Inputs

Results computed instantly — your data never leaves your device.

Live Concrete Calculator Results

Real-Time

Primary Result

66.67 ft³ / 2.47 yd³

Calculated client-side with guarded inputs.

Length (feet)

20

Width (feet)

4

100% Client-SidePrivate & Secure

How to Use the Concrete Calculator

  1. 1

    Enter slab length in feet.

  2. 2

    Enter slab width in feet.

  3. 3

    Enter average depth in inches.

  4. 4

    Review cubic feet and cubic yards, then add a practical waste allowance separately.

Formula & Mathematical Basis

Volume in cubic feet = length(ft) × width(ft) × depth(in) ÷ 12; cubic yards = cubic feet ÷ 27.

Variable Key

L

Length in feet

W

Width in feet

D

Depth in inches

📝 The result is geometric volume only; site waste, irregular shapes, reinforcement, and supplier minimums are not included.

Step-by-Step Examples

1

Rectangular slab

Scenario: A 20 ft × 10 ft area with 4 in depth.

  1. 1.Convert 4 inches to 0.3333 feet.
  2. 2.Multiply 20 × 10 × 0.3333.
  3. 3.Convert cubic feet to yards by dividing by 27.
  4. 4.Add project-specific waste after reviewing the base volume.
✅ Base volume is about 66.67 ft³ or 2.47 yd³.

Practical Use Cases

  • Estimate base material volume for a rectangular slab.
  • Compare supplier quantities before requesting a quote.

Common Pitfalls

  • Using depth in feet while the formula expects inches.
  • Ignoring uneven grade or openings.
  • Ordering without a site-specific waste allowance.

Frequently Asked Questions

Does this include waste?

No; it returns geometric base volume so you can add a project-specific allowance.

Does it handle circular or irregular areas?

No; this route models a rectangular prism.

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