The International Council of Marine Industry Associations (ICOMIA) supported by the International Marine Certification Institute (IMCI) has launched a scantlings calculator which uses a series of easy-to-use spreadsheets in order to provide a calculation method to help and encourage builders to comply with ISO (Small Craft) Scantling standard 12215 Part 5 for craft of hull length less than 12-meters in all design categories. 

In order to comply with RCD requirements, builders use the ‘Harmonised Standard’ which provides the ‘Presumption of Conformity’, however the complex nature of the document often forces them into to hiring a consultant or seeking a way to bypass the proof of compliance with the RCD.  IMCI, being of non-profit status, wants to support builders by offering this software for free.

The development team of the Southampton Solent University has produced 6 modules which cover most of the scope of ISO 12215 Part 5 (less wood); with an emphasis on simplified data entry. These modules may be found on the ISO website if the builder has a legal copy of the standard.

Please read the End User License Agreement, then fill out this application and fax it back to +32-87-3065-36 or send a scan to You will receive ASAP access to the free ISO 12215-5 calculator.

Until then you may study already the:

  • Core Helper, which provides a link between a number of common trade name cores and the modules all have a similar flow path, leading to a report which can go into the builder’s technical file.
  • Composite Tutorial, which is the calculator for reinforced plastic structures or the
  • Metal Tutorial, which is of great help for metallic structure calculations.

This calculator is of significant benefit to boat builders, particularly those currently self-certifying under the EU’s RCD.

Please note that a new standard, EN ISO 12215-5:2019 has been published. Until June 30, 2021 you may still used EN ISO 12215-5:2008 which is the technical core of the currently available self-certifier. After this date the "scantlings calculator" can no longer used for to achieve presumption of conformity.

IMCI will release a newsletter by email if a new version of this software related to EN ISO 12215-5:2019 will be available.