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Hawaii Marine Templates
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Trim & Stability Sheet (English Units)

Description: This spreadsheet automatically computes trim, forward draft, after draft, metacentric height and stability margin.  It also computes total weight, all centroids of total weight and the combined free surface effects of all tanks for a given vessel operating condition.   This calculative method depends upon Curves of Form input.  If the trim from these calculations exceed 1% of the LBP, the vessel designer is advised to make additional calculations to get more accurate results.  These additional free to trim equilibrium calculations are beyond the scope of this spreadsheet, but data from this spreadsheet will indicate if these special calculations are required.

Electronic Document Type:  Microsoft Excel spreadsheet          Cost: $35.00 US funds

Number of Pages: single sheet                        


  • The vessel's Light Ship weight and centroids, vessel length, vessel condition being evaluated (i. e. departure, arrival, 45% burnout, etc.)

  • The following is required for each item on board:

    • Weights and centroid information for passengers, crew, dry consumables (provisions and stores) on board.

    • Weights and centroid information for cargo (dry and liquid) on board.  Free surface information is required for the tanks carrying liquid cargo.  

    • Weights and centroid information for consumable liquids carried (fuel, water, etc.).   Free surface information is required for the tanks carrying consumable liquids.

  • After the above information is entered use the total weight obtained as a basis for the following data input:

    • Input the following Curves of Form data:  Draft, LCB, LCF, KMt and KML

    • Input the Maximum Allowable KG, or VCG, this is an optional input, but required if you want to compute the stability Margin


  • The total weight and centroids of the vessel in the condition being evaluated.  This includes all fluid weights present.

  • The total free surface effect for all the tanks involved.

  • The trim present, the trim angle, the forward draft, the after draft, corrections for free surface in KG, the metacentric height and the stability margin.

Suggested Reading:

  • naval architecture or yacht design texts 

  • Hawaii Marine Company Article "Understanding Trim"

  • Hawaii Marine Company Article "Understanding Stability"

  • miscellaneous science and engineering texts

  • Basic Ship Theory, by Rawson and Tupper

  • Skene's Elements of Yacht Design, Kinney

  • Principles of Naval Architecture, by SNAME

Terms: Prior to purchase, read our End User License Terms.

Important Notice to European Union Buyers: Due to changes in international law, we no longer accept purchases from any individuals located within an EU country.  However, businesses located within the EU are allowed to make purchases, provided that they make the VAT payments for any imported items purchased electronically.  These EU businesses must specify their VAT number in the memo section on the Paypal payment pages.  These changes are effective as of July 1, 2008, and were modified for EU businesses on April 9, 2010.  

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Minimum System Requirements: Windows 95/98/NT/2000/XP/Vista/Windows7

Sample: A sample document is shown below.

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