Car Loan Affordability Calculator

Find the maximum car price you can afford based on your monthly budget, interest rate, and loan term.

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Enter your values and click Calculate

Enter the maximum monthly car payment you can comfortably afford, your loan term, the expected interest rate, and any down payment you plan to make, and this calculator instantly tells you the maximum vehicle price within your budget. This reverse-amortization approach is the correct way to shop for a car: determine your payment budget first, then find the car that fits it — rather than falling in love with a vehicle and then scrambling to make the financing work. Financial advisors commonly recommend keeping your total monthly vehicle costs (loan payment plus insurance) below 15–20% of your take-home pay. Knowing your maximum loan amount upfront makes you a more informed negotiator at the dealership and prevents you from being upsold on a longer loan term to make a more expensive car seem affordable. The calculator also shows the total interest you would pay over the life of the loan, helping you evaluate whether the full cost of ownership aligns with your financial goals.

How It Works

The calculator inverts the standard loan amortization payment formula to solve for the maximum loan principal given a target payment. The standard formula is M = P × r(1+r)^n ÷ ((1+r)^n − 1), where M is the monthly payment, P is the principal, r is the monthly interest rate, and n is the number of payments. Rearranging to solve for P gives: maxLoan = M × ((1 − (1+r)^−n) ÷ r). The monthly rate r is the annual rate divided by 12 (e.g., 7% annual = 0.5833% monthly = 0.005833). This is the present value of an ordinary annuity formula. The maximum car price is then maxLoan + downPayment. Total interest paid is (monthlyPayment × n) − maxLoan. As an example: $400/month at 7% for 60 months gives maxLoan = 400 × ((1 − 1.005833^−60) ÷ 0.005833) ≈ $20,198.

Examples

Standard Budget
$400/month budget at 7% for 5 years with a $3,000 down payment.
Result: Max loan ~$20,198. Total buying power ~$23,198 with ~$3,800 total interest.
Higher Payment
$600/month budget at 6% for 5 years with a $5,000 down payment.
Result: Max loan ~$31,030. Total buying power ~$36,030.
Longer Term
$350/month at 8% for 7 years with no down payment.
Result: Max loan ~$21,868. Note: more total interest paid over 84 months.

Frequently Asked Questions

Should I include insurance and tax in my budget?
This calculator covers loan payments only. A realistic monthly car budget should also account for insurance (often $100–$300/month), registration fees, fuel, and routine maintenance. Financial advisors suggest your total car costs — including all of the above — should not exceed 15–20% of monthly take-home pay.
Is a longer loan term better?
A longer term reduces the monthly payment, which helps you qualify for a more expensive vehicle, but it significantly increases the total interest paid. A 7-year loan at 8% on a $25,000 vehicle costs over $7,700 in interest versus about $5,500 on a 5-year term. Longer terms also increase the risk of being 'underwater' — owing more than the car is worth — particularly in the first few years.
Should my down payment be as large as possible?
Generally yes — a larger down payment reduces the loan amount, lowers monthly payments, decreases total interest, and reduces the risk of going underwater. A down payment of at least 20% is commonly recommended for new cars, though for used cars, 10% or a specific dollar amount may be more practical depending on the vehicle's price and depreciation rate.

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