NOTE: The information on this page is complementary to the IRC Rule text and does not remove any obligation to read and comply with the IRC Rules.

Measurement drawings *including guidance on measuring x and h (and when it is required) updated 25/1/18

Standard Hull Data

Acceptable sources of data

ISAF Equipment Rules of Sailing (ERS) 2017-2020

Help with mathematical formulae used in the IRC Rule

Rules for Endorsement of IRC certificates (PDF) updated 2014

IRC worksheet (PDF) Print this and use it to collect the data for your application. Please do NOT use this as an application or input sheet!

IRC Measurement manual 2017 (PDF) published 6 Feb 2017

Guidelines for photographing your boat (PDF)

ORC equivalent data abbreviations



IRC weight & measurement input sheet (for official measurers) from 1/1/16 (Excel)

IRC Measurement Condition What needs to be aboard (or not) for measuring Boat Weight, Overhangs and Draft

IRC keel types

IRC lead in keel fins. Full paper

Bulb Weight clarification of what is included 

Bulb weight measurement



IRC aft rigging drawings. Full paper 

Simple measurement guides - rig and sails *note at present these show pre-2016 abbreviations

Spinnakers and pole/bowsprit rating explained (Nov 2017)

Single Roller Furling Headsail – Maximum size for a Heavy Weather Jib

Sail input sheet (for sailmakers and official measurers) from 1/1/16 (Excel)

Cutter rigs - 'beat to windward' definition

Headsail Upper (7/8) Width - HUW - default sizes for pre-2013 sails January 2013

ISAF ERS Q&A relating to headsail head point (January 2012)




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Header images by:

John Crawley (CAN IRC)  
Jinno (c/o JPN IRC)
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