The Rule of Twelfths is a rule of thumb for estimating the height of the tide at any time, given only the time and height of high and low water. This is important when navigating a boat or a ship in shallow water and when launching and retrieving boats on slipways on a tidal shore.

The rule assumes that the rate of flow of a tide increases smoothly to a maximum halfway between high and low tide before smoothly decreasing to zero again and that the interval between low and high tides is approximately six hours. The rule states that in the first hour after low tide the water level will rise by one twelfth of the range, in the second hour two twelfths, and so on according to the sequence 1:2:3:3:2:1.

WP-Tide-Height-Calculator is a plugin that gives an indication of the height of the tide at certain times in the tidal phase. Add [tide] in any page/post to show the calculator.


  • Tide Height Calculator in action.


  1. Download and unzip the latest release zip file

  2. If you use the WordPress plugin uploader to install this plugin skip to step 4.

  3. Upload the entire plugin directory to your /wp-content/plugins/ directory

  4. Activate the plugin through the ‘Plugins’ menu in WordPress Administration

  5. Add [tide] in any page/post to show the calculator. [tide] is the shortcode. This shortcode enables the site owners can simple show the Tide Height Calculator in anywhere of their wordpress website. This calculator can be shown in any existing page/post of the site.

  6. Use shortcode block in the visual editor and then add [tide] to show the calculator.


Q. How to show the Tide Height Calculator?

A. It is very simple to show Tide Height Calculator. To do so, you just need to add [tide] in any page/post to show the calculator.

Q. Can it be useful in the pages too?

A. Yes it is can be used in posts and pages.


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Contributors and Developers

“WP-Tide-Height-Calculator” is open source software. The following people have contributed to this plugin.


Change Log