Boat Loan Calculator — Marine Financing
Find the monthly payment on a boat loan — enter the purchase price, your down payment, the annual interest rate and the loan term in years to see the instalment, total interest and full cost.
%
years
Fixed monthly instalment for the loan term
41,659.19
Paid on loanAmount financed
67.2%
Total interest
32.8%
- 1
Amount financed
35,000 − 7,000 = 28,000 - 2
Monthly interest rate
r = 8.5% ÷ 12 ÷ 100 = 0.007083 - 3
Number of payments
n = 10 × 12 = 120 - 4
Growth factor
(1 + 0.007083)ⁿ = 2.3326 - 5
Monthly payment
28,000 × 0.007083 × 2.3326 ÷ (2.3326 − 1) = 347.16
How does this calculator work?
Monthly boat payment = (price − down) × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1), where r is the monthly rate and n is total months. Boat loans carry higher rates (often 7–12%) and terms of 5–20 years. Longer terms lower the payment but substantially raise total interest. The calculator covers principal and interest only.
Formula
How this is calculated
The amount financed (principal P) is the boat price minus your down payment — this is what you actually borrow. The annual interest rate is a nominal APR, divided by 12 and by 100 to give the monthly rate r. Multiplying the loan term in years by 12 gives the total number of monthly payments n. The standard fixed-rate amortisation formula, P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1), produces the constant monthly instalment that retires the loan exactly in n payments. Each instalment pays the month's accrued interest first; the remainder chips away at the balance.
Boat loans typically carry higher interest rates than car loans — often 1–3 percentage points above auto rates — because marine collateral depreciates differently and the lender's risk is higher. Lenders commonly offer terms from 5 to 20 years; longer terms lower the monthly payment but substantially increase total interest. Some lenders require a minimum down payment of 10–20% for vessels above a certain value.
This calculator covers principal and interest only. It excludes sales tax, registration, insurance, marina fees, fuel, maintenance and any loan origination fees, which can add materially to the true cost of boat ownership.
Frequently asked questions
Boats are considered luxury items with seasonal use, faster depreciation in some categories, and harder-to-repo collateral. Lenders price these extra risks into higher rates, typically 1–3 percentage points above equivalent auto loans.
Most lenders offer 5–20 year terms for new boats and 5–15 years for used ones. Longer terms are available for larger, higher-value vessels. A longer term lowers your monthly payment but significantly increases the total interest paid.
No — it covers principal and interest only. Add state/provincial sales tax, title/registration fees, sea-trial costs, insurance and any lender origination fee separately to get a complete purchase budget.
TG we-Calculate Editorial Team. (2026). Boat Loan Calculator — Marine Financing [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/boat-loan-calculator
TG we-Calculate Editorial Team. "Boat Loan Calculator — Marine Financing." TG we-Calculate. 2026. https://we-calculate.com/calculator/boat-loan-calculator.
TG we-Calculate Editorial Team, "Boat Loan Calculator — Marine Financing," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/boat-loan-calculator
@misc{wecalculate_boat_loan_calculator, title = {Boat Loan Calculator — Marine Financing}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/boat-loan-calculator}}, year = {2026}, note = {TG we-Calculate} }
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