Car loan interest is front-loaded: early payments are mostly interest. Shortening the term by a year or two or improving your credit score before buying can save hundreds or thousands.
How to use the Car Interest Calculator
- Car price
- Down payment
- Trade-in value
- Interest rate
- Loan term
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the car price, down payment, trade-in, interest rate and term.
Tips
- Use your real spending from bank statements rather than guesses.
- Automate savings so they happen before you spend.
- Revisit your plan once a year or after any big life change.
- Keep an emergency fund before investing for long-term goals.
Common mistakes to avoid
- Underestimating irregular expenses such as car repairs, gifts and annual bills.
- Ignoring inflation for long-term goals.
- Taking on high-interest debt to fund wants.
Inputs explained
| Field | What to enter |
|---|---|
| Car price | Amount in your currency |
| Down payment | Amount in your currency |
| Trade-in value | Amount in your currency |
| Interest rate | In % |
| Loan term | Units: years, months |
What each result means
- Loan amount = [Car price] – [Down payment] – [Trade-in value]
- Monthly payment = pmt([Interest rate]÷1200, [Loan term], [Loan amount])
- Total interest = [Monthly payment]×[Loan term] – [Loan amount]
- Interest as a share of the loan = [Total interest]÷[Loan amount]×100
- Interest on a 48-month loan = pmt([Interest rate]÷1200, 48, [Loan amount])×48 – [Loan amount]
- Interest in the first payment = [Loan amount]×[Interest rate]÷1200
Example values
How the main result changes when Car price changes and everything else stays at the example values above:
| Car price | Total interest |
|---|---|
| 15,000 | 2,448.88 |
| 22,500 | 4,285.54 |
| 30,000 | 6,122.2 |
| 37,500 | 7,958.86 |
| 45,000 | 9,795.52 |
| 60,000 | 13,468.84 |
Formula
Loan = price − down payment − trade-inPayment = loan × i ÷ (1 − (1 + i)^−n)Total interest = payment × n − loanWorked example
Inputs — Car price: $30,000; Down payment: $3,000; Trade-in value: $2,000; Interest rate: 7.5 %; Loan term: 6 years.
Results — Loan amount = $25,000.00; Monthly payment = $432.25; Total interest = $6,122.20; Interest as a share of the loan = 24.49 %; Interest on a 48-month loan = $4,014.68; Interest in the first payment = $156.25.
Frequently asked questions
How is car loan interest calculated?
Monthly interest = balance × APR ÷ 12; it falls as you repay.
Is a longer car loan worse?
It lowers the payment but increases total interest and negative-equity risk.
Can I pay off a car loan early?
Usually yes; most auto loans have no prepayment penalty.
What formula does the Car Interest Calculator use?
Loan = price − down payment − trade-in.