Auto Loan Calculator

Auto loan calculator at a glance#

An auto loan calculator works out your monthly car payment from the loan amount, the annual interest rate, and the loan term in months. The monthly payment is M = P times r times (1 + r) raised to n, divided by (1 + r) raised to n minus 1, where P is the amount borrowed, r is the annual rate divided by 12, and n is the number of monthly payments.

For a $30,000 loan at 6% for 60 months, r is 0.005 and n is 60, so the monthly payment is about $579.98. Over the full term you pay $34,799.04, which is $4,799.04 in interest on top of the $30,000 you borrowed.

The table shows the same $30,000 loan at 6% across common terms. A longer term lowers the monthly car payment but raises the total interest you pay. A down payment and a trade-in both reduce P, the amount you finance, so a $5,000 down payment and a $3,000 trade-in on that $30,000 car drop the loan to $22,000 and the 60 month payment to about $425.32. Sales tax, title, registration and dealer fees add to the price, so include them in P if they are rolled into the loan.

Enter your loan amount, interest rate and term in the calculator above for the exact monthly payment and total interest. These figures assume a fixed rate and equal payments, so your real APR, taxes and local fees can shift the final number.

Direct lending vs dealership financing#

You can finance a car two ways. Direct lending means getting the loan yourself from a bank or credit union before you shop, which gives you a rate to negotiate against. Dealership financing means the dealer arranges the loan, often through a lender tied to the carmaker. Getting pre-approved through direct lending first lets you treat the dealer's offer as just one more quote to compare, rather than the only option on the table.

Costs beyond the sticker price#

The monthly payment is not the whole cost. Sales tax, title and registration, document fees, and dealer charges all add to what you finance and vary by state. A manufacturer rebate lowers the price, but some states still tax the pre-rebate amount, so a $2,000 rebate on a $30,000 car may not cut the taxable amount. Roll any of these into the loan and they raise the principal, and therefore the payment. The APR captures lender fees like origination charges that a plain payment estimate leaves out.

Down payment and trade-in#

Both a down payment and a trade-in reduce the amount you finance, which lowers the monthly payment and the total interest. A larger down payment can also earn a lower rate and reduces the risk of owing more than the car is worth. In most states the trade-in also cuts your sales tax, since the tax is figured on the price after the trade-in is deducted. Dealers may offer less than private-sale value for a trade, so weigh the tax saving against selling it yourself.

Getting a good rate#

Your credit score is the biggest lever on the rate you are offered, and a shorter term usually carries a lower rate too. New cars often price below used ones. Decide whether a low-rate offer or a cash-back offer saves you more by running both through the calculator: cash back cuts the price up front, while a lower rate saves over the full term. Negotiate the total car price, not the monthly payment, since a dealer can hit a target payment by stretching the term.

Frequently asked questions#

How accurate is an auto loan calculator?#

It is accurate for the numbers you enter: price, term, rate, down payment, and trade-in. It may not include every fee or a variable rate, so the dealer's final figure can differ once tax, title, and lender fees are added.

What affects my auto loan interest rate?#

Mainly your credit score, the term, and whether the car is new or used. A higher score and a shorter term tend to mean a lower rate, and new cars usually price below used ones. Each lender sets its own criteria, so compare quotes.

Can I refinance my car loan for a better rate?#

Yes. Refinancing replaces your current loan with a new one, which can lower the rate or the payment. Check for any fees and make sure the new terms beat the old ones before switching.

Should I choose a shorter or longer term?#

A shorter term means higher monthly payments but less total interest. A longer term lowers the payment but costs more in interest overall. Pick the shortest term whose payment fits your budget.

Should I get pre-approved before shopping?#

Yes. Pre-approval shows what you can afford and gives you a rate to negotiate against at the dealer. The lender's credit check may dent your score slightly, but the negotiating leverage usually outweighs it.

What if I miss a payment?#

You may face a late fee and damage to your credit score, and repeated misses can lead to default and repossession. If you expect trouble, contact the lender early to discuss options.

Can I pay off a car loan early?#

Usually yes, and it saves interest since interest is charged on the remaining balance. Check your agreement first for any prepayment penalty before paying extra or settling the balance.