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.

Please note - some sail data abbreviations were updated recently, and some documents may still show the old abbreviation:
LL now HLU
LLmax now HLUmax
LP now HLP
SF now SFL

IRC 2018 Yearbook Errata

Measurement drawings *including guidance on measuring x and h (and when it is required) updated 10/4/18

IRC Measurement manual 2018 (PDF) 

Standard Hull Data

Acceptable sources of data

World Sailing 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!

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 *updated 2018

Spinnakers and pole/bowsprit rating explained (Nov 2017)   French language version

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

Cutter rigs - 'beat to windward' definition

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




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Header images by:

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