Glossary Term
Freeboard
Freeboard is the vertical distance between the waterline and the deck edge or assigned freeboard deck line at the ship’s side. In practical yacht terms, it is the visible height of the hull above the water. The amount of freeboard changes the way a yacht sits in the sea and how much reserve buoyancy remains as load increases.
The term matters in load assessment, seaworthiness, and design review because reduced freeboard usually means less margin before water reaches exposed deck areas. Yacht designers and engineering teams also look at freeboard in relation to hull form, stability, and operating profile, especially on vessels expected to carry large quantities of fuel, water, or equipment.
Freeboard is closely related to draft, but it measures the opposite side of the waterline condition. When a yacht loads deeper, draft increases and freeboard falls. That relationship makes freeboard useful as a quick visual clue to whether the vessel is sitting as expected for its current load state.