Estimating the value of a boat is very similar to estimating the value of a car or other vehicle. Some items that affect the value of a boat include its make, model, age, condition and any aftermarket accessories that have been installed. The best way to develop an accurate calculation of a boat's value is to gather information from several reliable sources.

Carefully examine the exterior and interior of the boat for fading, dents and other signs of damage and wear. Make note of any stalling or engine problems that the boat motor has. Be honest about the boat's condition in order to determine an accurate value.

Write down any aftermarket accessories that were added to the boat that may increase its value. Determine the cost of the part itself as well as the installation cost.

Look up the value of the boat in a valuation guide (see resources). Enter the correct make, model and year into the valuation system in order to obtain an accurate estimate.

Check local classified advertisements for boats similar to the one you own. Take an average asking price of at least three different boats to get an accurate estimate.

Examine all of the above price estimates and develop a low price and a high price for the boat, making sure to add in the cost of any aftermarket accessories. This range represents the boat's value.