About the Auto Loan
An auto loan calculator turns a vehicle price, deposit, term, and rate into a monthly payment and a total cost. Car financing is where the gap between an affordable monthly payment and an affordable purchase is widest, which is why the total figure matters.
The formula
M = (price − down) · [ r(1 + r)ⁿ ] / [ (1 + r)ⁿ − 1 ]The amount financed is the price less any deposit and trade-in. Terms of 60 to 84 months have become common, though longer terms carry real risks.
How to use this calculator
- 1Enter your Vehicle Price ($). The field starts at
30000, which you can overwrite. - 2Enter your Down Payment ($). The field starts at
5000, which you can overwrite. - 3Enter your Loan Term (Months). The field starts at
60, which you can overwrite. - 4Enter your Interest Rate (%). The field starts at
6.5, which you can overwrite. - 5Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Vehicle Price ($) | 30000 |
| Down Payment ($) | 5000 |
| Loan Term (Months) | 60 |
| Interest Rate (%) | 6.5 |
Result
Monthly Payment: $489.15
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
Cars depreciate quickly — commonly 20 percent in the first year and around 60 percent over five — while a long loan pays down principal slowly at first. The result is negative equity: for much of a 72 or 84 month loan, you owe more than the car is worth, so selling or writing it off leaves you paying for a vehicle you no longer have.
Dealers negotiate on monthly payment because it obscures everything else. A longer term, a higher price, and added products can all hide inside the same monthly figure. Negotiating the vehicle price, the trade-in value, and the financing as three separate conversations is what prevents this.
Things worth knowing
- A useful guideline is 20 percent down, a term no longer than 48 months, and total car costs under 10 percent of gross income.
- Arrange financing with a bank or credit union before visiting the dealer, so you have a rate to beat.
- Negotiate price, trade-in, and financing separately. Bundling them hides where the money goes.
- Gap insurance covers the difference between the loan balance and the insurance payout if the car is written off.
- Manufacturer 0 percent offers often require forgoing a cash rebate. Compare both options properly.
Frequently asked questions
How long should a car loan be?+
Under 60 months if possible, and ideally 48. Longer terms lower the payment but leave you in negative equity for years and cost substantially more in total interest.
How much deposit should I put down?+
Around 20 percent on a new car, which offsets first-year depreciation and helps you avoid owing more than the vehicle is worth.
What is negative equity?+
Owing more on the loan than the car is worth. It happens when depreciation outpaces principal repayment, which is common on long loans with small deposits.
Is 0 percent financing always the best deal?+
Not necessarily. These offers often require giving up a cash rebate, and taking the rebate with a conventional loan sometimes costs less overall. Compare total cost both ways.