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Draft Calculator

Estimate your boat's draft based on displacement and hull dimensions.

Quick Samples
Try these common configurations to get started

30ft Cruising Sailboat

Deep fin keel for upwind performance

25ft Planing Powerboat

Shallow draft for beaching

35ft Trawler

Full keel for stability

Hull Dimensions
Enter your boat's principal dimensions

feet

feet

pounds (lbs)

Range: 0.3 - 0.6

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About This Tool
The Boat Draft Calculator provides an essential estimate of how deep your boat will sit in the water based on its weight and hull shape. By inputting your boat's waterline length, beam, displacement, and block coefficient, you can determine the draft, a critical factor for navigation, stability, and performance. This tool is invaluable for designers checking their calculations and for builders assessing the impact of equipment choices on their vessel's characteristics.

Key Concepts:

Draft: The depth of water a boat needs to float freely.
Displacement: The weight of water displaced by the hull, equal to the boat's total weight.
Block Coefficient (Cb): A ratio indicating the fullness of the hull shape.
Wetted Surface: The surface area of the hull that is in contact with the water, a key factor in hydrodynamic drag.
Frequently Asked Questions

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