GEOTECHNICAL
Soil Bearing Capacity Calculator
Terzaghi's equation · Ultimate · Safe · Footing size · Soil parameters
qu
qall
FOS
Soil & footing parameters
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kN/m³
kN/m²
°
m
m
—
—
Ultimate bearing capacity (qu)
—
kN/m²
Safe bearing capacity (qall)
—
kN/m²
Bearing capacity factors
—
—
Net ultimate capacity
—
kN/m²
qu = c·Nc + γ·Df·Nq + 0.5·γ·B·Nγ
Capacity comparison
Ultimate vs safe bearing capacity
Capacity status
Bearing capacity
✓ ADEQUATE
Soil type
Stiff Clay
Footing shape
Square
FOS applied
3.0
Meyerhof's bearing capacity
—
kN/m³
kN/m²
°
m
m
—
—
Ultimate capacity (qu)
—
kN/m²
Safe capacity (qall)
—
kN/m²
Shape factors
—
—
Depth factors
—
—
qu = c·Nc·sc·dc + γ·Df·Nq·sq·dq + 0.5·γ·B·Nγ·sγ·dγ
Meyerhof comparison
Includes shape & depth factors
Status
Capacity
✓ ADEQUATE
Soil type
Stiff Clay
Method
Meyerhof
FOS
3.0
Typical soil properties
| Soil type | γ (kN/m³) | c (kN/m²) | φ (°) | qall (kPa) | Use |
|---|---|---|---|---|---|
| Soft Clay | 16 | 20 | 0 | 25-50 | Poor |
| Stiff Clay | 18 | 60 | 0 | 100-200 | Fair |
| Loose Sand | 15 | 0 | 28 | 50-150 | Fair |
| Medium Sand | 17 | 0 | 33 | 150-250 | Good |
| Dense Sand | 19 | 0 | 38 | 200-400 | Very Good |
| Gravel | 20 | 0 | 42 | 300-500 | Excellent |
| Hard Rock | 24 | 400 | 45 | 1000+ | Excellent |
Terzaghi: Nc = (Nq−1)cotφ | Nq = eπtanφtan²(45+φ/2) | Nγ = 2(Nq+1)tanφ