How to Calculate a Monthly Loan Payment (Auto and Personal Loans)
What goes into a loan payment?
Every standard loan payment has two parts: principal (the money you borrowed) and interest (the fee for borrowing it). Early payments are mostly interest. Later payments are mostly principal. This pattern is called amortization.
The three inputs you control are:
- Loan amount: the price minus your down payment or trade-in.
- Interest rate (APR): the yearly cost of the loan. Your lender quotes this.
- Loan term: how many months or years you take to repay.
How to use the loan calculator, step by step
- Enter the loan amount. For a car, use the full price.
- Add a down payment or trade-in if you have one. The calculator subtracts it for you.
- Enter the APR from your offer or pre-approval.
- Choose the loan term.
- Read your monthly payment, total interest, and total cost.
Example: how the term changes the cost
Same $25,000 loan at 7% APR, three different terms:
| Term | Monthly payment | Total interest |
|---|---|---|
| 48 months | about $599 | about $3,735 |
| 60 months | about $495 | about $4,702 |
| 72 months | about $426 | about $5,688 |
Going from 48 to 72 months lowers the payment by about $173 but adds about $1,953 in interest. Try your own numbers in the calculator to see the trade-off.
Ways to lower what you pay
- Put more down. Every dollar you do not borrow saves interest.
- Compare offers. A one point lower APR can save hundreds. Use the loan comparison calculator to check two offers side by side.
- Pick the shortest term you can afford. A payment that fits your budget comfortably beats a stretched one.
- Pay extra when you can. Check that your lender has no prepayment penalty.
What to watch out for
The calculator shows the loan itself. Real costs can also include fees, taxes, insurance, and add-ons. Ask your lender for the full list before you sign.
Frequently asked questions
How do I calculate a monthly loan payment?
Divide the loan amount into equal payments using the loan amount, the interest rate (APR), and the number of months. A $25,000 loan at 7% APR over 60 months costs about $495 per month. The loan calculator does this math for you.
Does a bigger down payment lower my monthly payment?
Yes. A down payment reduces the amount you borrow, so both the monthly payment and the total interest drop.
Is a shorter loan term better?
A shorter term has a higher monthly payment but much less total interest. A longer term is easier on the monthly budget but costs more overall.
What is APR?
APR is the yearly cost of borrowing, shown as a percentage. It is the rate to enter in the calculator.