Last Updated on July 25, 2025 by Colin Le Conte

The French tend to use “coefficient” to highlight the range of the tide. Essentially this is a percentage.

• 70% is an average tide
• 95% is an average (mean) spring tide
• 45% us an average (mean) neap tide

The coefficient can vary between 20 and 120. The higher the coefficient, the larger the tidal range. Tides above 85 are called spring tides and below 55 are called neap tides.

This is a useful, official site for tides at many of the marinas – maree.shom.fr/

Please call the marinas direct if you wish to find out how busy they are. Nearly all the Brittany and Normandy marinas DO NOT take reservations and so beware of 3rd party sites offering bookings. 

---

New Tides help information – please do read this

The times given do allow for British Summer Time when this is in force. Please do not leave it until the last minute. Although Digimap endeavours to make sure that all information on this site is accurate it cannot be held responsible and excludes all liability for any loss which may result from using this information

Tidal data © Crown Copyright. Reproduced by permission of the Controller of Her Majesty’s Stationery Office and the UK Hydrographic Office www.ukho.gov.uk