Displacement Calculator
Calculate vessel displacement from hull dimensions
Results
Displacement
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Displacement (long tons)
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Displacement (metric tons)
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Volume Below Waterline
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Displacement/Length Ratio
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Hull Category
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Hull Speed
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Displacement/Length Ratio Guide
| D/L Ratio | Category | Characteristics |
|---|---|---|
| < 100 | Ultralight | Racing, easily driven |
| 100 - 200 | Light | Performance cruiser |
| 200 - 275 | Moderate | Cruiser/racer |
| 275 - 350 | Moderate-Heavy | Traditional cruiser |
| > 350 | Heavy | Full displacement, seaworthy |
D/L Ratio = Displacement (lbs) ÷ (0.01 × LWL)³
About Block Coefficient
The block coefficient (Cb) is the ratio of the underwater hull volume to the volume of a rectangular box with the same length, beam, and draft. A Cb of 1.0 would be a perfect rectangular barge.
Low Cb (0.35-0.45)
Fine entry, narrow waterlines. Racing boats, performance sailboats. Easy to drive but less volume.
Medium Cb (0.45-0.55)
Balanced design. Most cruising sailboats and trawlers. Good compromise of volume and performance.
High Cb (0.55-0.65)
Full hull form. Workboats, barges, heavy cruisers. Maximum volume but more resistance.