Georgia Boater Education Course


MAXIMUM HORSEPOWER

If you don’t have a capacity plate on your boat—which may be the case if you’re operating a small, flat-bottomed boat—you can calculate the largest safe engine size in the following way.

Maximum Horsepower Calculation: Boat length x boat width = boat square footage

First, find out the square footage of your boat by multiplying its length by the width of the transom. 

Then use the table here, and reprinted on the page below, to find out your boat’s maximum horsepower. For example, a twelve-foot boat with a four-foot transom width translates into a maximum engine size of fifteen horsepower.

LENGTH X WIDTH =

MAX HP

35 FT OR LESS

3

36 - 39 FT

5.5

40 - 42 FT

7.5

43 - 45 FT

10

46 - 52 FT

15

 

EXAMPLE

BOAT LENGTH = 12 FT.

BOAT WIDTH = 4FT.

12 FT. X 4 FT. = 48

MAX HP OF 15