Calculator inputs
Enter your income, debt, credit profile, rate, and upfront cash. Results appear above this form after submission.
Example data table
These illustrative profiles show how different income, debt, rate, and cash combinations can change your estimated buying range.
| Scenario | Income | Debts | Score | Rate | Term | Down + Trade | Max Vehicle Price | Monthly Cap |
|---|---|---|---|---|---|---|---|---|
| Budget commuter | $4,800.00 | $350.00 | 690 | 7.40% | 60 mo | $3,000.00 | $22,372.55 | $439.80 |
| Family crossover | $7,600.00 | $650.00 | 748 | 6.10% | 72 mo | $9,000.00 | $62,256.88 | $989.52 |
| Higher trim SUV | $9,800.00 | $900.00 | 795 | 5.50% | 60 mo | $17,000.00 | $84,103.41 | $1,446.00 |
Formula used
Payment cap = min( Gross income × PTI limit, Gross income × DTI limit − Other debts )
Adjusted cap = Payment cap × Credit factor − Monthly insurance
Principal = Payment × ( 1 − (1 + r)−n ) ÷ r
where r = monthly interest rate and n = number of months
Vehicle price = ( Loan amount + Down payment + Trade in − Fees ) ÷ ( 1 + Sales tax )
The calculator first limits your payment using both payment-to-income and debt-to-income rules. It then applies a credit sensitivity factor, subtracts insurance, converts the remaining payment into a loan amount, and backs into a vehicle price after tax and fees.
How to use this calculator
- Enter your gross monthly income before taxes.
- Add your current monthly debt obligations.
- Provide your estimated credit score and loan rate.
- Choose the loan term you expect to request.
- Include cash down, trade in value, tax, and fees.
- Add a monthly insurance estimate for a more realistic budget.
- Type a target vehicle price to compare your request with the estimate.
- Press Estimate pre approval to see results above the form.
Frequently asked questions
1) Is this a real lender pre approval?
No. It is an educational estimate based on affordability math and the limits you enter. A real lender may also review credit reports, income documents, employment stability, vehicle age, and program rules before issuing a final decision.
2) Why do credit scores change the estimate?
Lenders often price and approve loans differently by risk tier. This calculator uses a credit adjustment factor to create a more conservative estimate when the score is lower, even if the same rate is entered.
3) What is PTI in this calculator?
PTI means payment-to-income. It limits how much of your gross monthly income should go to the auto payment. Many shoppers use PTI to keep transportation costs manageable.
4) What is DTI and why does it matter?
DTI means debt-to-income. It measures how much of your income is already committed to debt. A lower DTI usually helps approval odds because lenders see more room for the new payment.
5) Should I include insurance in a pre approval estimate?
Including insurance makes the result more realistic. Even if a lender focuses on the loan payment, you still need a car budget that fits your full monthly ownership cost.
6) Why is the requested vehicle marked borderline?
Borderline means the target price sits close to your estimated payment or DTI limit. A small change in rate, fee structure, tax, or lender policy could move the result from acceptable to too expensive.
7) Can a longer term raise my estimate?
Yes. A longer term spreads the loan across more months, which can increase the financed amount supported by the same payment cap. However, total interest usually rises as the term gets longer.
8) What improves my pre approval estimate fastest?
The strongest levers are lowering existing debts, increasing cash down, improving credit, shopping for a lower rate, and choosing a less expensive vehicle. Any one of these can materially improve the estimate.