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Construction

Calculatrice vérifiée avec une formule transparente

Construction

Concrete Pier Footing Calculator.

Estimates the volume of concrete needed for a cylindrical pier footing and the weight of that concrete.

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 diameter and depth of one pier in feet.

  2. 2

    Enter the number of identical piers.

  3. 3

    The calculator computes the volume of one pier using the cylinder formula.

  4. 4

    It multiplies by the number of piers to get total volume and weight.

pi * (diameter / 2)^2 * depth * num_piers

Questions fréquentes

How do I convert cubic feet to cubic yards?

Divide the total cubic feet by 27. For example, 75.4 ft³ ÷ 27 ≈ 2.79 yd³.

What is the weight of concrete per cubic foot?

Standard concrete weighs about 150 pounds per cubic foot, but it can vary with mix and moisture.

Should I order extra concrete?

Yes, it's wise to order 5-10% extra to account for spillage, uneven excavation, and variations in the mix.

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Résultats

Formule vérifiée

Total Concrete Volume

—ft³

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 cylindrical pier footing and the weight of that concrete.

  1. Measure the diameter and depth of one pier in feet.
  2. Enter the number of identical piers.
  3. The calculator computes the volume of one pier using the cylinder formula.
  4. It multiplies by the number of piers to get total volume and weight.

Formules

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

Cylinder Volume

V = π × (d/2)² × h

The volume of a cylindrical pier is the area of the circular base (πr²) times the height (depth).

Example:

Input: d = 1.5 ft, h = 3 ft

Calculation: π × (0.75)² × 3

Result: ≈ 5.30 ft³ per pier

Cas d'utilisation réels

Où ce calcul apparaît dans la vie quotidienne.

Deck Footings

Determine concrete needed for cylindrical footings supporting deck posts.

Example: A 12-inch diameter, 3-foot deep footing for a deck post.

Fence Posts

Calculate concrete for setting fence posts in cylindrical holes.

Example: Six 10-inch diameter holes, 2.5 feet deep.

Structural Piers

Estimate material for concrete piers used in foundations or carports.

Example: Four 18-inch diameter piers, 4 feet deep.

Conseils et erreurs courantes

Tips

  • Always measure the actual hole diameter, which may be larger than the post due to digging.
  • Use a concrete calculator to convert volume to bags: one 60-lb bag yields about 0.45 ft³.
  • Add 10% to your order to avoid running short.
  • Check local building codes for minimum footing sizes and depths.

Common Mistakes to Avoid

  • Using the post diameter instead of the hole diameter.
  • Forgetting to multiply by the number of piers.
  • Not accounting for the flared base of some footings, which increases volume.

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.