Trailer Loan Calculator
Enter the trailer price, down payment, rate and term to see the payment, total interest and a payoff schedule, with presets for utility, car hauler and travel trailer prices.
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Your last 10 settings, saved only in this browser. Nothing is uploaded.
How to use the Trailer Loan Calculator
- Type the equipment price, meaning the trailer price.
- Type your down payment and choose % of the price or a dollar amount. Enter 0 if you are not making one.
- Type the interest rate (APR, %).
- Type the loan term and choose years or months.
- Optional: type an extra payment each period. It is added to every payment.
- Open More options. Type the trade-in credit in dollars, if you have a vehicle or trailer to trade.
- Type the sales tax rate. Rules vary by place, so use the rate you were quoted.
- Tick “Charge tax only on price minus trade-in” if tax should be charged on the price minus the trade-in. Leave it unticked to charge tax on the full price.
- Type any fees financed, and choose Payments: monthly (12 a year) or every 2 weeks (26 a year).
- Optional: type a first payment date as YYYY-MM-DD. The payment schedule will then show dates for each row.
- Read the payment, then “Total interest”, “Total of all payments”, and “Total cost”. “Total cost” is your down payment, trade-in, and all payments added together.
- Scroll to the year-by-year summary table and the payment schedule, which shows the first 120 rows. If you entered an extra payment, check “Time saved by the extra payment” and “Interest saved by the extra payment”.
How is a trailer loan payment calculated?
A trailer loan payment is calculated from the amount you finance, the interest rate per payment period, and the number of payments. The tool uses the standard loan formula: Payment = P × i / (1 − (1 + i)^−n). Here P is the amount financed, i is the APR divided by payments per year, and n is the term in years multiplied by payments per year.
How does the amount financed get worked out?
The amount financed, P, is the trailer price minus the down payment and trade-in, plus sales tax and fees. Sales tax is charged on the full price, or on the price minus the trade-in when that box is ticked. You type the tax rate yourself, because rules vary by place. Any fees you add are included in P as well.
What happens when the interest rate is 0%?
At 0%, there is no interest to calculate, so the payment is simply P divided by n. For example, if the amount financed were $12,000 and the term gave 60 monthly payments, each payment would be $200 (12,000 ÷ 60) before any rounding. The interest and total of payments would then match the amount financed.
Why do the totals come from a schedule?
Total interest, total of payments, and total cost are not taken from the formula alone. They come from a payment-by-payment schedule that uses the unrounded payment. A lender rounds the payment to the cent, so its figures can differ slightly. The yearly summary table is built from the same schedule, so the year totals add up to the loan totals.
How do extra payments change the result?
An extra payment per period is added to every regular payment. This lowers the balance sooner, so less interest builds up in later periods. The tool compares the result with the same loan without the extra payment and reports the time saved and interest saved.
Why might my lender’s numbers differ?
The Payments setting is plain arithmetic: the periodic rate is APR divided by the number of payments per year. Lenders may calculate biweekly payments, odd first periods, or fees differently, and some add charges that are not in the inputs. Use the results to compare options and to check your own arithmetic, then confirm the final terms with the lender in writing.
Sources (checked 15 October 2026): openstax.org · openstax.org
Worked examples
| Input | Result |
|---|---|
| $12,000.00 at 8.5 % for 5 years | $221.58 per month, interest $2,494.71 |
| $12,000.00 at 6.5 % for 3 years | $331.01 per month, interest $1,116.33 |
| $12,000.00 at 8.5 % for 5 years | $221.58 per month, interest $920.89 |
Calculated by the tool above; open it with the same values to see each step.
Frequently asked questions
Is the trailer loan calculator free to use?
Yes. It runs in your browser, is free, and needs no sign-up.
Are my numbers saved or sent anywhere?
Nothing is uploaded. The calculation runs on the page with the numbers you type.
What sales tax rate should I enter?
Enter the rate you were quoted for your area. Rules vary by place, so the tool does not set a rate for you.
Why is the payment different from my lender’s quote?
Lenders may use different rounding, biweekly or odd-period methods, or fees that are not in the inputs. Compare the inputs against the quote line by line.
Does an extra payment always save money?
An extra payment lowers the balance sooner, which reduces the interest charged in later periods. The “Time saved by the extra payment” and “Interest saved by the extra payment” results show the difference for your inputs.
Are the starting numbers current rates?
No. The starting price and APR on the page are example values, not current market rates. Type the price and rate from your own quote before you read the result.
Is this financial advice?
No. The results are arithmetic on the numbers you enter. They are not financial or tax advice.
Related tools
- Equipment Loan Calculator: use it for a general equipment loan with the same payment inputs.
- Heavy Equipment Loan Calculator: use it when you are financing large machinery rather than a trailer.
- Tractor Loan Calculator: use it when the purchase is a tractor.
- Semi Truck Loan Calculator: use it when the purchase is a semi truck.
- Equipment Lease Calculator: use it to compare a lease against a loan using your own numbers.
- Equipment Depreciation Calculator: use it to estimate how the value of equipment may fall over time.
- MACRS Depreciation Calculator: use it to work out MACRS depreciation on your own inputs.
- MACRS Depreciation Table: use it to look up the MACRS percentages table.