Handy Propeller pitch calculator from
Turning Point Propellers. The range covers, Mercruiser, Volvo Penta, OMC, Yamaha, Suzuki,Johnson, Evinrude and Tohatsu.
(Prices Currently in US Dollars)

 

 

Using The Prop Wizard you can enter all your boat's information, like engine size, type of boat etc and extra weight etc, the wizard will then tell you exactly which prop you need.