New Car Payment Calculator: Estimate Monthly Costs

An Edmunds new car payment calculator can estimate a vehicle’s monthly loan payment from its price, down payment, trade-in value, APR and loan term. The calculator below estimates the principal-and-interest payment from loan amount, APR and term; it also shows total interest, while taxes, fees and other costs must be added separately.

Formula

The calculator uses the standard fixed-rate, fully amortizing loan payment formula. It finds a level monthly payment that covers interest and repays the starting balance over the selected number of months:

M = P × r / [1 − (1 + r)−n]

• M is the monthly principal-and-interest payment, in dollars.
• P is the amount financed, in dollars.
• r is the monthly interest rate, calculated as APR ÷ 1,200. For example, 8% APR gives a monthly rate of 0.006667.
• n is the number of monthly payments, calculated as years × 12.

The payment is rounded to cents. Total interest is calculated as the rounded monthly payment multiplied by the number of payments, minus the original loan amount: I = M × n − P. The APR is entered as a percentage per year, not as a decimal or a monthly rate.

Worked Example

Using the calculator’s default values—$20,000 financed, 8% APR and five years—the loan has 60 monthly payments. The monthly rate is 8 ÷ 1,200 = 0.0066667.

M = 20,000 × 0.0066667 ÷ [1 − (1 + 0.0066667)−60], which is approximately $405.53 per month when rounded to the nearest cent.

Total interest using that rounded payment is $405.53 × 60 − $20,000 = $4,331.80. The total of the scheduled payments is therefore $24,331.80. These figures describe the loan arithmetic only; they do not represent a specific vehicle offer.

How an Edmunds New Car Payment Calculator Fits In

Edmunds provides car-shopping information and tools, and its payment-calculator features may let shoppers enter vehicle-specific figures such as price, down payment and trade-in. Tool layouts and available fields can change, so check the current Edmunds page for its exact inputs and output details. The calculator on this page is a separate estimate: enter the amount you expect to finance, the APR quoted for your situation and the term being considered.

To estimate the amount financed, start with the vehicle’s agreed price and account for the down payment and any trade-in equity. A trade-in with a loan balance may not reduce the amount financed by its full value: the remaining balance can affect the amount rolled into the next loan. Add any taxes, registration charges, dealer or documentation charges, and optional products only if they will be financed. A lender’s itemized figures are needed for an accurate loan amount.

What the Monthly Payment Does—and Does Not—Include

The result is the scheduled monthly principal-and-interest payment under a fixed APR and term. It is not the full cost of owning or operating a car. Costs that may sit outside the loan payment include insurance, fuel or charging, maintenance, parking, and vehicle registration. Taxes and fees may also be paid up front or financed, depending on the transaction; this calculator has no inputs for them.

For a realistic comparison, use the same assumptions in each estimate: amount financed, APR and number of payments. If one quote includes financed fees and another does not, their payments are not directly comparable. Ask for an itemized amount financed and the payment schedule rather than relying on a monthly figure alone.

Choosing Inputs and Understanding the Trade-Offs

• Loan amount: Use the amount actually borrowed, not automatically the advertised vehicle price. Include only costs that will be financed.
• APR: Enter the annual percentage rate as a number such as 8 for 8%. Use the rate supplied for the specific financing estimate; do not treat a promotional or illustrative rate as a guaranteed offer.
• Term: Enter the repayment period in years. The formula converts it to monthly payments. A longer term spreads repayment across more months, which generally lowers the scheduled payment for the same loan amount and APR but increases total interest.
• Down payment and trade-in: They are not separate calculator inputs. Reflect their effect by entering the resulting amount financed. If a trade-in has an outstanding loan, account for that balance when determining the amount.

This calculator requires an APR above zero because its payment formula divides by the monthly rate. If a financing offer specifies zero interest, use the simple calculation amount financed ÷ number of payments instead, while checking the offer’s actual conditions. The estimate also assumes a fixed rate and regular monthly payments; it does not model variable rates, skipped payments, extra payments or a changing balance from fees.

Common Calculation Mistakes and Limits

A frequent error is entering 0.08 instead of 8 for an 8% APR. Another is entering the vehicle’s sticker price as the loan amount even though a down payment or trade-in will reduce borrowing—or financed taxes and fees will increase it. Check whether a quoted payment includes only principal and interest or other products or charges as well.

Rounding matters. This calculator rounds the payment to the nearest cent and uses that rounded payment to calculate total interest, so the displayed total can differ slightly from a calculation that keeps many extra decimal places throughout. A real loan schedule may also reflect lender-specific payment dates, fee treatment, or final-payment adjustments. The formula is a planning estimate, not a payoff quote or a substitute for the written loan disclosure.

Frequently Asked Questions

Does Edmunds have a new car payment calculator?
Edmunds offers car-shopping tools, including payment-estimation features; availability and fields can change. Check its current site for the tool’s present options. This page’s calculator independently estimates a fixed-rate payment from loan amount, APR and term.

What information do I need to calculate a new car payment?
You need the amount financed, annual APR and loan term. To arrive at the amount financed, account for the purchase price, down payment, trade-in equity and any taxes or fees that will be included in the loan.

Is a car payment calculator’s result the full monthly car cost?
No. The result here covers principal and interest only. Insurance, fuel, maintenance and other ownership costs are not included, and taxes or fees are included only if reflected in the loan amount you enter.

Why does a longer car loan show a lower monthly payment?
A longer term divides repayment into more monthly installments. For the same amount and APR, that usually reduces each scheduled payment while increasing the total interest paid over the full term.

Can I use this calculator for a zero-interest offer?
Not with the formula shown, which requires an APR above zero. For a genuinely zero-interest loan with equal payments, divide the amount financed by the number of payments, then check the offer’s terms and any charges separately.

This result is an estimate; the lender’s disclosure gives the exact figures.

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in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2