IRC Documents & Information
- IRC measurement manual (updated Nov 2026)
- Acceptable Sources of Data
- Endorsement Standards and Process (updated Feb 2024)
- IRC worksheet - Print this and use it to collect the data for your application. Please do NOT use this as an application or input sheet
- Help with Mathematical Formulae Used in the IRC Rule
- Photographing your boat for IRC
- World Sailing Equipment Rules of Sailing (ERS)
- World Sailing International Measurer qualification - IRC events
Download or view key IRC documents and IRC rating information.
Icon Key
Downloadable PDF File
Downloadable Excel File
Downloadable Word File
External Website Link
Internal Website LinkOne Designs & Standard Hull Data
IRC One-Designs may use the OD simplified application form. Please request this from your Rule Authority.
Production designs with standard hull data need not supply LH, overhangs, beam, or boat weight. Rig and sail data are not standard and shall be supplied.
This list may not include most recently rated designs. If in doubt please contact your Rule Authority to check the status of a particular design.
Measurement Guides
Please refer to the latest IRC Measurement Manual (see above) and its appendices. This section includes additional guides.
If you require an Endorsed certificate the data will need to be officially measured, please contact your Rule Authority for this or if you have any queries.
For standard production designs it not necessary to measure LH, Beam and Draft, unless modified, or required by your Rule Authority.
Rig & Sails
- Number of Headsails Q+A v1 2024
- Heavy Weather and Storm Jib sizes (updated Jan 2024)
- Flying Headsail Summary and Q+A v2 2024
- IRC Flying Headsail v. headsail set flying
- Sail Measurement Stickers Q+A v3 - 6 Feb 24
- IRC sail check and area calculation form
- IRC sail measurement sticker template (for approved measurer use only)
- Sail input form for approved sail measurers (.xlsx)
- In-House Certificate (IHC) World Sailing page
- Single furling headsail allowance - an explanation of the overlap limit
- IRC aft rigging drawings
- Headfoil width - rig factor
- Cutter rigs - 'beat to windward' definition
- Sail materials
