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Construction

Concrete Walkway Calculator.

Estimates the volume of concrete needed for a rectangular walkway based on length, width, and thickness.

Results update live as you type.
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Your inputs

How it works

  1. 1

    Measure the length and width of the walkway in feet.

  2. 2

    Measure the thickness in inches.

  3. 3

    Multiply length × width × thickness (converted to feet) to get cubic feet.

  4. 4

    Divide by 27 to convert to cubic yards.

(length * width * (thickness / 12)) / 27

Frequently asked questions

How do I convert thickness from inches to feet?

Divide the thickness in inches by 12. For example, 4 inches = 4/12 = 0.333 feet.

Why divide by 27?

There are 27 cubic feet in one cubic yard (3 ft × 3 ft × 3 ft). Concrete is usually ordered by the cubic yard.

Should I order extra concrete?

It's common to add 5-10% for waste, spillage, or uneven subgrade. This calculator gives the theoretical volume.

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Concrete Volume

0cubic yards

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Estimate for general guidance only — verify important decisions with an appropriate professional.

How it works

Estimates the volume of concrete needed for a rectangular walkway based on length, width, and thickness.

  1. Measure the length and width of the walkway in feet.
  2. Measure the thickness in inches.
  3. Multiply length × width × thickness (converted to feet) to get cubic feet.
  4. Divide by 27 to convert to cubic yards.

Formulas

The math behind this calculator, written out so you can verify the result.

Volume in cubic feet

V = L × W × (T / 12)

Multiply length and width (in feet) by thickness converted to feet.

Example:

Input: L=10 ft, W=3 ft, T=4 in

Calculation: 10 × 3 × (4/12) = 10 cubic feet

Result: 10 ft³

Convert to cubic yards

Y = V / 27

Divide the cubic feet volume by 27 to get cubic yards.

Example:

Input: V=10 ft³

Calculation: 10 / 27 ≈ 0.37

Result: 0.37 yd³

Real-world use cases

Where this calculation shows up in everyday life.

Home walkway

Estimate concrete for a front or backyard path.

Example: 20 ft × 3 ft × 4 in ≈ 0.74 yd³

Garden path

Plan a narrow, decorative walkway.

Example: 15 ft × 2 ft × 3 in ≈ 0.28 yd³

Commercial sidewalk

Budget for a wider, thicker walkway.

Example: 50 ft × 5 ft × 6 in ≈ 4.63 yd³

Tips and common mistakes

Tips

  • Measure in feet for length and width, and inches for thickness.
  • Round up to the nearest quarter yard when ordering.
  • Add 5-10% extra for waste and uneven ground.
  • Check local building codes for minimum thickness requirements.

Common Mistakes to Avoid

  • Forgetting to convert thickness from inches to feet.
  • Using square feet instead of cubic feet.
  • Not dividing by 27 to get cubic yards.

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.