Mat Foundation Calculator

Design mat (raft) foundations with soil pressure distribution and settlement analysis

Total Building Load - kN

Mat Length - m

Mat Width - m

Moment X - kN·m

Moment Y - kN·m

Spacing X - m

Spacing Y - m

Soil Bearing Capacity - kN/m²

Modulus of Subgrade Reaction - kN/m³

Semi-Rigid

λL = 3.07

Average

27.78 kN/m²

Maximum

30.00 kN/m²

Minimum

25.56 kN/m²

Required Thickness

400 mm

Concrete Volume

72.0 m³

Est. Settlement

0.1 mm

Max Bending Moment

347.2 kN·m/m

10.0 cm

8.0 cm

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: Standard Mathematical References

by Various

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.