Boat Loan Calculator

Financing a boat

A boat loan is a marine loan secured by the vessel itself — much like a car loan is secured by the car. What sets boat financing apart is the range of vessels involved, from a modest trailerable runabout to a large cruiser or yacht, and the lender's requirements scale with that. Larger and more expensive boats often qualify for long terms, with ten to twenty years common on bigger vessels, which keeps the monthly payment manageable but adds substantial interest over time.

Two boat-specific hurdles are worth knowing about before you apply. First, for a used or larger boat, lenders commonly require a marine survey — an independent inspection of the vessel's condition and value, similar to a home appraisal and inspection rolled into one. Second, the boat's age can affect financing: many lenders are cautious about older hulls and may shorten the term, raise the rate, or decline the loan entirely. There's also a titling distinction — smaller boats are typically state-titled, while larger vessels may be documented with the U.S. Coast Guard, which can matter for how the lender secures its interest.

This calculator models a standard fixed-rate, fully amortizing loan, which fits most boat financing. Treat the result as a clean baseline and confirm any survey requirements, age limits, or unusual loan structure with your lender.

How to use this calculator

Take the boat's purchase price, subtract your down payment and any trade-in, and enter the result as the amount financed. Include sales tax and registration only if you're rolling them into the loan. Enter the quoted APR and the term; the tool returns your fixed monthly payment, the total interest over the life of the loan, your payoff date, and a downloadable amortization schedule.

How it's calculated

The payment is derived from the standard amortization formula. Your annual rate becomes a monthly rate, applied across the number of months in the term to find the single fixed payment that pays the loan to zero by the end. Each month, interest is charged on the outstanding balance first; the rest reduces principal. Because the balance is highest at the start, early payments are mostly interest, and on a long marine loan the balance drops slowly in the first few years. Extra payments early therefore save the most interest.

A worked example

Say you finance $60,000 for a used cruiser at a 7.75% APR. Over a 15-year (180-month) term the payment is about $565 a month, with roughly $41,700 in total interest. Shorten the term to 10 years and the payment rises to about $719, but total interest falls to roughly $26,300 — about $15,000 saved. The longer term is easier month to month but considerably more expensive overall.

How term length changes the cost

The same $60,000 financed at 7.75% across common boat-loan terms. Rounded, illustrative figures.

Tips and common mistakes

If you're buying used, budget for a marine survey upfront — it protects you as much as the lender and can flag costly problems before you commit. Ask early whether the boat's age fits the lender's limits, since an older hull can shorten the term or change the rate. Don't forget the costs the loan doesn't cover: insurance, winter storage or a slip, haul-out, and maintenance can rival the payment over a season. And as always, compare the total-interest figure across terms rather than choosing on the monthly payment alone.