Marine Calculators
Hull Speed
Maximum Speed of a Single-Hull Displacement Boat
Hull Speed = 1.34 * (LWL)
1/2
Boat Speed
If your speed log is disabled, you can calculate the boat's speed by determining the time it takes for a wood chip or other floating object to pass from the bow to the stern. If you want to retrieve the object, attach a string to it.
Boat Speed = (60 (sec/min) * 60 (min/hr) * length of boat in feet) /
( 6076.1 (feet/nautical mile)* seconds for chip to pass)
Sail Area Displacement Ratio
This ratio indicates how fast the boat is in light wind. The higher the number the faster the boat.
| 10-15 | Cruiser |
| 16-20 | Cruiser-Racer |
| 21-24 | Racer |
| > 24 | Performance Racer |
Sail Area Displacement Ratio = Sail Area / ( Displacement Volume )
2/3
Displacement Volume in Cubic Feet = Weight in Pounds / 64
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