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Sloped Footing Calculator

Calculate concrete volume for a sloped (truncated pyramid) pad footing, plus material mix and steel reinforcement. Export to DXF.

Sloped Footing Parameters

Bottom Mesh

Planta (Parrilla Inf.)2.00 m2.00 m
Perfil X-X2.00 m20 cm30 cm
Perfil Y-Y2.00 m20 cm30 cm
Vista 3D Isométrica

Bar Bending Schedule (BBS)

Pos.ElementShapeØ (mm)QtyLength (m)Total (m)Weight (kg) (Net)
1Bottom Dir. Xa=1.85b=0.25Ø 12142.3532.9029.24
2Bottom Dir. Ya=1.85b=0.25Ø 12142.3532.9029.24

Material Estimate

Total Concrete Vol (m³) (+5%)

1.39 m³

Base Volume: 0.800 m³ | Sloped Volume: 0.525 m³

Cement (50kg bags)

9

Water (Liters)

225 L

Sand (m³)

0.61 m³

Gravel (m³)

1.22 m³

Steel Reinforcement

Bottom Mesh Weight61.41 kg
Total Steel Weight (kg)61.41 kg

What is a Sloped Footing?

A sloped or stepped footing is designed to save concrete material by reducing the thickness towards the edges, where the bending moment and shear stresses are lowest. This tool helps engineers calculate the exact volume of the truncated pyramid and the required reinforcement.

Truncated Pyramid Volume Formula

The total volume is the sum of the rectangular base (V1) and the sloped truncated pyramid (V2). V2 is calculated using the areas of the base (A1) and the top (A2).

V = (L × W × h1) + [ h2/3 × (A1 + A2 + √(A1 × A2)) ]

Practical Example

For a footing with Base 2x2m, Top 0.5x0.5m, Base thickness 0.2m, and Sloped thickness 0.3m: Base Vol = 2×2×0.2 = 0.8m³. Top Area = 0.25m². Sloped Vol = 0.3/3 × (4 + 0.25 + √(4×0.25)) = 0.1 × (4.25 + 1) = 0.525m³. Total Volume = 1.325m³.

Frequently Asked Questions

Why use a sloped footing instead of a flat isolated pad?

Sloped footings require significantly less concrete while providing the same structural safety, making them highly economical for large scale projects.