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Software, Knowledge Hub and Online resources for the Marine Professional


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Why the bollard pull calculation method for a barge won’t work for a ship

In my working with the marine transportation industry for more than a decade now, I have come across many different calculations for required bollard pull for both barges and ships. The principles of the calculation are same, whether it is a ship, a barge...


STEEL  COILS LOADING –  ITS CHALLENGES AND WAYS TO OVERCOME by Mr. Spiros Malliaroudakis (Founder & Managing Director, S.A. Malliaroudakis Maritime (UK) Ltd) The loads derived from steel coils loading are very concentrated, leading to higher stresses in...

Naval architecture, new challenges and a new horizon

Naval architecture, new challenges and a new horizon by Lim Soon Heng, BE, PE, FSSS, FIMarEST Founder President, Society of FLOATING SOLUTIONS (Singapore) Civilization has arrived at a point of inflexion triggered by global warming and rising sea levels....

Mooring System Design and Analysis

Mooring System Design and Analysis by Rahul Kanotra, Consultant Naval Architect As the offshore industry moves towards greater technological advancements, one thing that has plagued the engineers is the “plug and play” computer programs or software. I am...

Cargo Stoppers – why they are critical and how to design them

Stoppers and their critical role in seafastening of cargo Introduction A cargo transported on the deck of a ship is subject to many forces. These forces comprise of the inertial forces due to the ship motions – the three translations and three rotations – and the...

Fellow Marine Professionals

Welcome To


Are you a Marine or Oil & Gas professional looking for online resources for your work?

Chances are, you came to this page looking for some handy calculators which you can use in your design process, or to quickly check the suitability of your equipment for your upcoming Marine/Offshore operation. Or maybe you came looking for some expert training available online to learn an industry software, or to know how to prepare for your upcoming design or operational challenges.

We house an array of spreadsheets and software created for use in marine/offshore engineering and operations. The Learning Hub houses some useful video tutorials for popular industry software; and the Articles section has rich technical articles covering various aspects of design, engineering, and operations of ships & offshore structures.

Intuitive, Easy to use

Marine Calculators

From Design to Operations in easy to use Spreadsheets

Our Calculators form an essential part to every Marine/Offshore professional’s Kit

Designed to Save your Time and Money

Based on credible references and literature

Downloaded by thousands of our trusted clients

High acceptability by MWS, Class and other approval authorities

Marine Transportation

Pad-eye Design Spreadsheet

Not sure if the existing lifting lug can take the loads? Or want to design a new lug for cargo sea-fastening? This spreadsheet provides a rigorous design for a pad-eye and is one of our bestsellers. A suite of other apps helps you design the structural accessories like stoppers, dog-plates, bollards stanchions and lashings 

View the Pad-eye calculator

View All products in Marine Transport

Towing Operations

Bollard Pull Calculators

Looking for the tug for your charter barge or ship? Use these tools to select the right sized tug and avoid losing money going for an over-sized tug based on thumb rules. Further use our towing bridle design spreadsheet to complete your tow equipment selection. Hundreds of our clients have trusted these for their critical towing operations.

View Bollard Pull Calculator for Barges

View All Products for Towing Ops

Marine Operations

Mooring Design Spreadsheets

Unsure about the mooring design of your upcoming berthing operation. Evaluate your design using our mooring calculators. Further, use our calculators based on OCIMF standards to know the environmental loads on your tanker or gas carrier.

View the Mooring Design App for berthing (Port/Stbd on Quay)

View All Products for Marine Operations

Ship Corrosion

Cathodic Protection Design

Worried about how many anodes will be needed to provide complete protection from corrosion for your ship, boat or offshore structure? This spreadsheet, based on DNV RP-B-401 gives a precise number based on a user selected anode design.

View Cathodic Protection App >>

View All Products in this Category >>

Ship Design

Ship Stability Calculator

Want to run a quick check on the stability and trim of your vessel without having to go through an elaborate software? With pre-fed hydrostatics and tank particulars, our extremely handy tool Shipload calculates the stability and trim parameters in a flash.

View Shipload

View All Ship Design Products >>

Ship Efficiency

Ship EEDI Calculator

Are you spending thousands of dollars on evaluating the EEDI of your vessel in the design or sea trial stage? Use this comprehensive, reliable and easy-to-use application to calculate your vessel’s Energy Efficiency Design Index (EEDI).

View All >>


What our Customers Say

You do a fine job of explaining the methodology and inputs to your spreadsheets which allows our people to make effective use of them immediately. We will certainly continue in the future, to purchase your products

Robert. P. Hill


Your spreadsheet is great, even better that the software I am used to.

I am using it in order to design fenders for a new Harbour in Montevideo.

Jose Zorrilla

Civil Engineer, ACI, NACE

Just wanted to thank you for your assistance with the two technical analyses we conducted recently.

I was pleased with the work provided, which was very professional. In addition, your response to enquiries and requests for further analyses was always prompt, which was very much appreciated.

I look forward to working with you in the future.

Tony Laubreaux

Laubreaux Marine SARL

TheNavalArch’s products have been handy for us in getting reliable Engineering Calculations for critical Marine Operations like Mooring, Loadout and Towing which we carry out on a regular basis.

The Technical Support is prompt and helpful in clarifying doubts and queries. Technical Consultancy provided for Critical Loadout operations involving Ballasting and Stability Calculations have helped us deliver our projects timely.

Capt. M.S.Kulwant Singh

EkOne Safety and Marine Management Pte Ltd, Singapore

So far I have downloaded Lug and Cargo forces spreadsheets and use them daily and find them very useful.

I get similar results with my own spreadsheets so it’s great to have a double check as its very easy to make a mistake in a spread sheet

Kris Decke

Design Engineer

Thank you for the outstanding help we received during our project.

Your products have also been helpful to us in our operations.


Highnet Marine Technology Co.,Ltd. (HMT Korea)

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