Work out block coefficient instantly with clear inputs, formula shown and shareable results.
Block coefficient is the ratio of the actual underwater volume to the box that just encloses it: Cb = volume / (L x B x T). Full hulls near 0.85 carry the most cargo for their dimensions, while fine hulls near 0.55 make less wave resistance and are used where speed matters.
Block coefficient
Cb = displaced volume / (L x B x T)
Marine results are planning estimates only. Verify against the vessel's approved stability booklet, loading manual, class society rules and applicable maritime regulations before loading or sailing.
About 0.80-0.87 for tankers and bulkers, 0.60-0.70 for general cargo ships, 0.55-0.65 for container ships and below 0.5 for fast craft.
Full hulls make large wave systems, so they are economical only at low Froude numbers. Fine hulls trade cargo volume for lower resistance at speed.