See also:
Ted Brewer Presents A Primer on Yacht Design - The Numbers
Ted Brewer Yacht Design
Carl's Sail Calculator v3.0.
Sail Calculator Pro v3.0
D / L = Displacement / [( 0.01 x LWL ) cubed]
Displacement is in long tons (2240 pounds)
BOAT TYPE D/L RATIO
Light
racing multihull 40-50
Ultra light ocean
racer 60-100
Very light ocean
racer 100-150
Light cruiser/racer 150-200
Light cruising auxiliary 200-250
Average cruising auxiliary 250-300
Heavy cruising auxiliary 300-350
Very heavy cruising auxiliary 350-400