Marine Mortgage Calculator – Estimate Your Monthly Payment
Calculate Your Marine Mortgage
Estimate your monthly marine mortgage payments and true ownership costs.
- Total Loan Amount:
- Total Interest Paid:
- Total Cost (Loan + Interest):
- Payoff Time:
- Interest Saved (extra payments):
- Extra Monthly Costs:
- Total Monthly Ownership Cost:
| Year | Principal Paid | Interest Paid | Remaining Balance |
|---|
A marine mortgage is how most serious boat purchases are financed — a loan secured against the vessel itself. This free marine mortgage calculator estimates your monthly payment, total interest and true ownership costs, whether you call it a marine mortgage, boat loan or yacht finance.
How to Use the Marine Mortgage Calculator
- Enter the boat price — the purchase price of the vessel.
- Enter your deposit — 10 to 30 percent is typical for marine mortgages.
- Enter the interest rate and term — marine mortgages commonly run 10 to 20 years.
- Add an extra monthly payment (optional) — see your payoff accelerate and interest fall.
- Toggle ownership costs — insurance, berthing and maintenance for the true monthly cost.
How Does a Marine Mortgage Work?
A marine mortgage works like a property mortgage: the lender secures the loan against the boat (often requiring Part 1 registration on the UK Ship Register for larger vessels), and you repay over 10–20 years. Because the boat is collateral, rates are lower than unsecured borrowing — typically 5.5%–9% for well-qualified buyers.
For example, a $150,000 boat with a $30,000 deposit (20%) at 6.5% APR over 20 years costs about $895 a month. Switch to GBP for UK figures. Larger purchases may need specialist yacht finance — see our yacht loan calculator. If you are still setting the budget, our boat affordability calculator works backwards from what you can pay monthly.
Marine Mortgage Rates, Deposits and Terms
Deposits of 20%+ unlock the best rates; 10% is the usual minimum. Terms stretch to 20 years on newer, higher-value boats and shrink for older hulls. Lenders will want a valuation or full condition survey, proof of insurance (with their interest noted), and sometimes Part 1 registration. Compare deposit scenarios with our boat down payment calculator before applying.
The True Cost Beyond the Mortgage Payment
Berthing or marina fees, comprehensive insurance, winterisation, servicing and unexpected repairs commonly add 8–12% of the boat's value per year. A $150,000 boat can easily cost $12,000–$18,000 a year before the mortgage payment. Read our boat ownership guides, the maintenance checklist and the depreciation guide to budget the full picture. For canal boats, try our narrowboat finance calculator.
Marine Mortgage Calculator FAQs
What is a marine mortgage?
A loan secured against a boat or yacht, repaid over 10–20 years — the marine equivalent of a property mortgage, often called boat finance or yacht finance.
How much deposit for a marine mortgage?
Typically 10–30%. At 20%+ you will access the best rates and the widest choice of lenders.
How long can a marine mortgage run?
Usually 10–20 years, depending on the boat's age, value and survey. Newer, higher-value boats qualify for the longest terms.
Do I need a survey for a marine mortgage?
Yes — lenders require a valuation at minimum, and a full condition survey for most used boats.
Is a marine mortgage the same as a boat loan?
Effectively yes — "marine mortgage", "boat loan" and "yacht finance" describe the same secured borrowing. Our main boat loan calculator covers the same maths for any vessel.
Can I get a marine mortgage on an older boat?
It is harder: expect bigger deposits, shorter terms and higher rates, and some lenders will decline boats over 20–25 years old.
Michael Carter is a financial research writer specializing in vehicle financing, loan calculations, interest rates, and consumer budgeting. He creates practical, easy-to-understand resources that help readers make more informed financing decisions.
