Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
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Use this result
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What does this calculator estimate?
An auto-loan calculator estimates your monthly payment, total interest, and amortization schedule for a car loan. It also helps you budget for your sales tax and fees. Enter the loan amount, rate, and term to see the payment.
- Payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1]
- Total interest can be substantial over a long term
- A shorter term or bigger down payment saves interest
How an auto loan works
An auto loan amortizes: each monthly payment covers the interest for that month, then reduces the principal. Over the term the balance falls to zero. Because cars depreciate, longer terms can leave you owing more than the car is worth.
Limitations to watch for
The estimate uses the rate and term you enter; your actual rate depends on credit, lender, and the car. It doesn't automatically include sales tax, title, and registration fees (the tool has a separate line). Trade-ins and rebates change the effective loan amount. Cars depreciate, so a long term can put you upside-down.
How to use it in practice
Budget the payment within your overall debt-to-income. A shorter term saves a lot of interest even if the payment is higher. Add sales tax and fees to get the real amount financed, and avoid a term longer than you'll keep the car.
- Enter the loan amount (or price minus down payment).
- Enter the rate and the term (in months or years).
- The calculator shows the monthly payment, total interest, and amortization schedule.
How this calculator works
Formula
Auto loan payment = principal × [r × (1+r)^n] ÷ [(1+r)^n − 1], where r = annual rate ÷ 12 and n = term in months. Then total interest and the full amortization schedule are computed over the loan.
Worked example
a $25,000 auto loan at 6% for 60 months pays about $483/month and accrues roughly $4,000 in total interest.
Assumptions to verify
- A fixed-rate amortizing auto loan.
- Sales tax and fees are separate, entered only if you add them.
- The payment is principal + interest only, before taxes and registration.
Frequently asked questions
How do I calculate an auto loan payment?
Payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1], where r is the monthly rate and n the number of months.
What is a good auto loan term?
Shorter is usually cheaper. 36–60 months is common; terms over 72 months add a lot of interest and increase the risk of owing more than the car's worth.
Should I put money down?
A bigger down payment reduces the amount financed and the interest, and lowers the chance of being upside-down. It also can improve your rate.
Does the payment include tax and fees?
Not by default. Sales tax, title, and registration are separate. Factor them into the total amount you finance.
How much interest will I pay?
It depends on the rate, term, and amount. A 6% 60-month loan costs roughly $4,000 in interest per $25,000 borrowed.
What rate will I get?
Your rate depends on credit score, lender, and the car. Check pre-approval rates before shopping to know your number.
Why might I owe more than the car is worth?
Because cars depreciate faster than a long loan pays down. A long term with little down payment can leave you 'upside-down' early in the loan.
Cite this tool
BoringToolsKit. “Auto Loan Calculator.” boringtoolskit.com/auto-loan-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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