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UK Tidal API

Tidal predictions from the UK's largest authoritative network of tidal stations

ADMIRALTY UK Tidal API

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Access tidal predictions for the UK coastline, built using accurate and reliable data from the country's largest network of tidal stations.


The UK Tidal API offers different subscription options depending on your requirements: 

Discovery - provides a free 1-year subscription to access the current plus 6 days’ worth of tidal events for 607 tidal stations around the United Kingdom.

Foundation - provides a 1-year subscription to access the current plus 13 days’ worth of tidal events for 607 tidal stations around the United Kingdom.

Premium - Provides access to historical and the current plus 1 years’ worth of tidal events and interval predictions for 607 tidal stations around the United Kingdom.



Access ADMIRALTY APIs

Sign up to the ADMIRALTY API​ Developer Portal  to enable access to ADMIRALTY APIs. This portal also contains documentation and code snippets to help you get the best out of the UK Tidal API.

Access the ADMIRALTY API​ Developer Portal >​​


About our data


The UK Hydrographic Office is a leading centre for hydrography, providing marine geospatial data to inform maritime decisions. We work with a wide range of data suppliers and partners to support maritime navigation, safety, security and marine development around the UK and worldwide.

​We make location-based information available through ADMIRALTY Maritime Data Solutions, our world-leading range of charts, publications and custom data sets.


Find out more about the UKHO >​​

Quick guide to UK Tidal API features


Below we've included some key information you may need to know before you get started. You can get full documentation, including code snippets, on the ADMIRALTY API Developer Portal.


Access the Developer Portal here >


​​Feature​​​ ​What the ​UK Tidal API offers

​Output Formats

​JSON, XML

Data ​Set Update Frequency

​Every 12 months

Coverage United Kingdom

​Usage Limits

​Discovery - 10 requests per second, 10,000 requests per month



​Foundation – 20 requests per second, 20,000 requests per month


​Premium – 100 requests per second, 100,000 requests per month

Terms of Use for API access​


Access to and usage of our UK Tidal API is subject to conditions set out our Terms of Use document. This important document includes details on ownership and service availability.


Download our Discovery UK Tidal API Terms of Use​ 

Download our Foundation UK Tidal API Terms of Use​ 

Download our Premium UK Tidal API Terms of Use 


Contact us


If you have any additional queries or need further support, please contact the team at customerservices@ukho.gov.uk