Floatation Calculator Used to calculate the size & quantity of floats needed to build your dock. Length Width Total Area Weight Dock Size ft ft Square Feet Dead Load Number of People Weight of People Live Load Number of Floats Total Weight Total Load Float Width inches Safety Factor 20% Float Length inches Design Weight lbs Float Height inches Quantity Width Length Height Floatation Required Inches x Inches x Inches With empty platform the floats will be submerged inches Freeboard inches With weight of people the floats will be submerged inches Freeboard inches *Freeboard is the distance the float is out of the water. **For each additional inch in float height, the freeboard will increase one inch. To increase the *freeboard, increase the float **height or width or length, or add additional floats. Posted by Justin at 2:07 pm on August 5th, 2009.