Padeye Calculator v1

Price: £38.12 (£38.12 Inc. VAT)
Padeye and shackle calculator


Padeyes are restraint or carrying lugs used for anchoring or lifting and frequently found in major construction yards. As their failure can have disastrous consequences they must be designed to exacting standards.

They are usually designed to accommodate a recognised shackle of suitable capacity; whilst the same design methods apply to both applications, larger safety factors are normally applied to lifting equipment than to anchors (e.g. seafastenings).


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Padeyes sizes the padeye to fit a recognised shackle design.

The database of shackle sizes ranges from 0.33t to 1500t the important dimension of which are common to all standard Bow and Dee type designs. Whilst the shackle database includes both metric and Imperial dimensions, it does not convert one from the other, it uses the standard metric and standard Imperial dimensions.

The padeye calculator provides the minimum required material based upon a few basic inputs; i.e. applied load, pin and cheek clearances, cheek-plate thickness and maximum allowable stress. In addition to which, you select a shackle from the list; 'SWL (t):' based upon its safe working load and Padeyes will provide the unknown dimensions including the minimum weld thickness required to anchor the padeye to a suitable surface.

Padeyes may be used in conjunction with CalQlata’s Lift Rigging and Wire Rope calculators

For help using this calculator see Technical Help

Padeye Calculator - Options

Padeyes calculates the dimensions of a padeye that will fit a shackle of your choice based upon your maximum allowable stress.


You enter: and the padeye calculator will provide:
  • Force
  • Cheek thickness
  • Eye clearance
  • Pin clearance
  • Maximum stress
  • Young's modulus
  • Weld joint factor
  • Plate thickness
  • Padeye radius
  • Padeye clearance
  • Weld thickness
  • Hole diameter
  • Pin diameter
  • Width between eyes
  • Eye diameter
  • Throat clearance
  • Bow diameter
  • Bearing stress
  • Bending stress
  • Tensile stress
  • Shear stress

Note: Lift rigging loads can be calculated using CalQlata’s lift rigging calculator, and vessel motions can be calculated using CalQlata’s vessel motions calculator.

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