GRP Laminate Skin Thickness Calculator

(1 customer review)





This excel sheet helps the user to design the laminate layers of an FRP boat
From the rules/design, you may have achieved the total cured thickness needed for your laminate
Ending up with a thinner laminate means weaker laminate and thicker laminate means excess material is being spent
The user can try out various combinations of CSM and WR reinforcements to achieve the thickness accurately, along with other mechanical properties

Instructions for use
1. The table in IO-COMPUTE work sheet gives the following

  • The collective thickness (except the gelcoat) for the number of layers of reinforcements used
  • Ultimate tensile strength (N/mm2)
  • Tensile modulus (N/mm2)
  • Ultimate compressive strength (N/mm2)
  • Compressive modulus (N/mm2)
  • Ultimate shear strength (N/mm2)
  • Shear modulus (N/mm2)
  • Ultimate flexural strength (N/mm2)
  • Flexural modulus (N/mm2)

2. Depending on the layer sequence of reinforcements you want to try, please select “CSM”, “WR” , or “None” for the fields in D6 to D15 as you want .
3. Accordingly change the value of specific reinforcement you have or want to use in E6 to E15
4. A default of 10 layers of reinforcements is given here, but you can use as many or as few layers as you want
5 . To add more layers, click the button “”ADD LAYER”” and a new layer will be added in row 5 and the layer numbers will change
6. To delete a layer, select “NULL” for “SELECT LAYER TYPE ” COLUMN
7. The table gives the total weight of the laminate, total thickness of the resulting laminate and the total glass content

A hand layup process is highly dependent on the applicator and the results can vary from person to person


Rules and Regulations for the Construction and Classification of High Speed Crafts and Light Crafts
Chapter 7 General Hull Requirements for Fibre Composite and Sandwich Constructions
Section 5 Material Properties and Testing

Additional information

Software Versions

Annual License, Trial

1 review for GRP Laminate Skin Thickness Calculator

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  1. Costas Carabelas (verified owner)

    easy and fast to assess results

    • Team TheNavalArch (store manager)

      Hi Costas
      Many thanks for the review. The creator Mr Bijit Sarkar sends thanks
      Team TheNavalArch

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Please visit our FAQ page for all questions on usage of our products. For any issues, please write to

FAQs on Products

Important: Our excel-based products work only on Windows machines, and not on Macs

System Requirements:

MS Excel 2013 and up

Windows 7 and up