Compare entered immersed geometry and water-density displacement with a documented same-condition displacement reference.
A quick decision brief for this specific tool
Waterline length/beam, mean draft, externally sourced block coefficient, entered water density and documented same-condition displacement
Immersed volume, geometry displacement in pounds/correct short and long tons, and signed comparison with the documented value
Multiplies a bounded entered immersed envelope by coefficient and density; it is not hydrostatics, stability, loading, trim, survey or design certification
Choose your path
Compare an entered immersed-envelope/coefficient/density displacement estimate with documented same-condition displacement using correct unit definitions.
Keep waterline geometry, coefficient and density explicit.
Enter same-condition LWL, waterline beam, mean draft, sourced coefficient and water density.
Sees a coarse geometry result without calling it certified displacement.
Compare geometry arithmetic with builder, hydrostatic, survey or measured evidence.
Enter the documented displacement and inspect the signed difference plus immersed volume.
Can trace the difference without confusing short and long tons.
Keep stability, trim, capacity and seaworthiness decisions outside the worksheet.
Use qualified naval-architecture/survey evidence for consequential work.
Does not authorize loading, modification or operation from the estimate.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Waterline length × waterline beam × mean draft forms a bounding volume; multiplying by the externally sourced block coefficient estimates immersed volume for that entered condition.
Immersed volume is multiplied by entered water density. Short tons use 2,000 lb and long tons use 2,240 lb; NAVSEA distinguishes about 64 lb/ft³ seawater and 62.4 lb/ft³ fresh water.
The coarse geometry result is compared with entered builder, hydrostatic, survey or measured evidence for the same load/draft condition. It is not a stability or loading analysis.
Updated: August 2026
Re-run the same immersed volume with documented local water density and observe the resulting displacement difference.
Compare the entered envelope/coefficient estimate with a documented hydrostatic, builder or survey displacement for the same condition.
Inspect pounds, 2,000-lb short tons and 2,240-lb long tons together to prevent the old mislabeled ton conversion.
Use waterline beam, mean immersed draft and a coefficient valid for the exact hull/load condition; align appendages and enclosed volumes with the source hydrostatics.
Use verified hydrostatic/builder/survey data and qualified naval-architecture or marine-survey guidance for loading, trim, stability, modification, capacity or operation decisions.
Build a transparent entered-geometry/density displacement check and compare it with documented same-condition evidence. This is not hydrostatics, stability or survey certification.
