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此计算器目前以英文显示，翻译正在准备中。

建筑

已验证计算器，公式透明

建筑

Concrete Porch Calculator.

Estimates the volume of concrete needed for a rectangular porch slab in cubic yards.

结果随输入实时更新。
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您的输入

工作原理

  1. 1

    Measure the length and width of the porch in feet.

  2. 2

    Measure the thickness in inches.

  3. 3

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

  4. 4

    Divide by 27 to get cubic yards.

round((length * width * (thickness / 12)) / 27 * 100) / 100

常见问题

How do I convert inches to feet?

Divide the thickness in inches by 12 to get feet.

Why divide by 27?

There are 27 cubic feet in one cubic yard.

Should I order extra concrete?

It's common to order 10% extra to account for spillage and uneven subgrade.

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结果

公式已检查

Concrete Volume

0.99cu yd

询问任何问题

估算仅供参考——重要决策请咨询专业人士。

工作原理

Estimates the volume of concrete needed for a rectangular porch slab in cubic yards.

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

公式

此计算器背后的数学公式，供您核对结果。

Volume in cubic yards

V = (L × W × T) / 324

L and W are in feet, T is in inches. Dividing by 324 converts cubic inches to cubic yards.

Example:

Input: L=10 ft, W=8 ft, T=4 in

Calculation: (10 × 8 × 4) / 324 = 320 / 324

Result: ≈ 0.99 cu yd

实际应用场景

此计算在日常生活中的应用。

Planning a new porch

Estimate concrete needed before ordering from a ready-mix supplier.

Example: A 10x8 ft porch with 4-inch slab.

Budgeting materials

Calculate cost by multiplying volume by local concrete price per cubic yard.

Example: 0.99 cu yd × $150/cu yd ≈ $148.50

Comparing slab thickness

See how changing thickness affects concrete volume and cost.

Example: Increasing from 4 to 6 inches adds about 0.5 cu yd for a 10x8 slab.

提示与常见错误

Tips

  • Measure to the nearest 0.1 foot for accuracy.
  • Add 10% extra for waste and uneven ground.
  • Check local building codes for minimum thickness.
  • Use a concrete calculator for irregular shapes separately.

Common Mistakes to Avoid

  • Forgetting to convert thickness from inches to feet.
  • Using square feet instead of cubic feet.
  • Not accounting for waste or over-excavation.

假设与限制

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