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Fender Size Guide

Choosing the right size fender

Consider these factors when selecting the appropriate size for your fenders: Yacht Length Overall, Yacht Displacement (weight) and the anticipated mooring conditions.

There is an old-fashioned rule of thumb that will give you a starting point before making a final decision based on these three main factors.

Rule of Thumb 1 = 1 inch fender diameter or 2 inch round fender diameter for every 4 or 5 feet of yacht length overall.

The rule has been interpreted and converted approximately into modern metric equivalents in the table:

Boat Fender Size Guide
Yacht Length Overall under 5m 6m 8m 10m 12m 14m 16m 18m
Cylindrical Fenders Diameter 100mm 125mm 150mm 200mm 250mm 300mm 350mm 400mm
Majoni Star Size Star 1 Star 1 Star 2 Star 3 Star 4 Star 5 - -
Polyform F Series Size F01L F1/F02 F2/F3 F3/F4 F4 F5 F5/F6 F7/F8
Round Fenders Diameter 200mm 250mm 300mm 400mm 500mm 600mm 700mm 800mm
Majoni Buoy Size RB1 RB1 RB1 RB2 RB3 - -
Polyform A Series Size A1 A1 A2 A3 A4 A5 A6

Frequency Guide

There is another old rule of thumb for this as well.

Rule of Thumb 2 = 1 fender per 10 feet of Low Waterline Length (LWL) with a minimum of 3 for boats of 20 feet or less. The rule has been developed into a modern metric measure equivalent.

Boat Fender Frequency Guide
Yacht LWL under 6m 6m-10m 10m-14m 14m-16m 16m-18m
Fenders 3 4 5 6 7

How to set up boat fenders

Fenders need to be deployed in a proper fashion, paying due care and attention to the spacing and height of the fenders and assessing what proportion should be round rather than cylindrical fenders.

Deploy at least one fender amidships (maximum beam), with the remainder spaced appropriately fore and aft from the centre outward.

When mooring alongside another yacht (rafting up), an extra fender or two amidships will be required for adequate protection. An additional round fender deployed fore and aft will help to fill the increased gap between the topsides.

Hang fenders so they are always clear of the water or even higher when required by the pontoon height. Secure the fender lanyards to strong, deck level anchorage points. Avoid using lifelines or guard wires if possible because they are not designed to withstand the potential stresses and strains. A lower attachment point maintains the fender in position better by lessening the arc or swing.

Cleaning Fenders

Keep your fenders clean and free from harmful grit by washing them with soap and water. Harsh cleaning agents are not advisable as they will harm the surface of the fender.

Majoni Fender Guide

Fender covers are washable and help to keep your fenders clean and grit free, as well as protect them from the elements.

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Mooring Information