
Tide Height Calculator in action.
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.
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.