Offshore Platform Design Calculator

Estimate foundation sizing, bearing capacity, and stability ratios for gravity-based offshore platforms under combined dead, live, and environmental loads.

Inputs

Dead load (kN)

Live load (kN)

Horizontal env. load (kN)

Vertical env. load (kN)

Overturning arm (m)

Allowable bearing (kPa)

Soil friction coefficient

Safety factor (FoS)

Tab to move between fields

Results

Total vertical load (kN)

20,500

Required base area (m²)

205

Overturning FoS

2.21

Equivalent diameter (m)16.16

Overturning moment (kN·m)75,000

Sliding FoS4.1

Actual bearing pressure (kPa)150

How to Use This Calculator

Enter dead load (kN), live load (kN), horizontal environmental load (kN), and vertical environmental load (kN).
Enter overturning arm (m) — lever arm from seabed to environmental load centroid.
Read total vertical load (kN) and overturning moment (kN·m).
Check sliding and overturning unity check ratios — values < 1.0 indicate a stable platform.
Use load combination results to size jacket legs and seabed foundation elements.

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