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Construction

Calculatrice vérifiée avec une formule transparente

Construction

Concrete Porch Calculator.

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

Les résultats se mettent à jour en direct pendant que vous tapez.
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Vos entrées

Comment ça marche

  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

Questions fréquentes

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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Résultats

Formule vérifiée

Concrete Volume

0,99cu yd

Demander n'importe quoi

Estimation à titre indicatif uniquement — vérifiez les décisions importantes avec un professionnel approprié.

Comment ça marche

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.

Formules

Les mathématiques derrière cette calculatrice, écrites pour que vous puissiez vérifier le résultat.

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

Cas d'utilisation réels

Où ce calcul apparaît dans la vie quotidienne.

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.

Conseils et erreurs courantes

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.

Hypothèses et limites

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