Car Affordability Calculator (How Much Car Can I Afford?)
Instead of starting from a car price and asking whether the payment fits, this calculator works backwards: you tell it the monthly payment you can comfortably budget, the loan's APR and term, and any cash down or trade-in, and it solves for the largest loan — and therefore the highest car price — that payment can support. Enter your monthly income and it also checks your budget against the common 15%-of-income guideline. It estimates the financeable amount only; it is not financial advice or a loan pre-approval.
Your budget & loan
Optional
Max car price you can afford
$23,443.47
$20,443.47 loan + $3,000.00 down
Max loan
$20,443.47
15%-rule check
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Affordability detail
Max price by loan term
How it works
The math is the present value of an annuity — the same amortization formula a lender uses, run in reverse. Your maximum loan equals monthly payment × (1 − (1 + r)^−n) ÷ r, where r is your monthly rate (APR ÷ 12 ÷ 100) and n is the term in months. In plain terms, it discounts each of your future payments back to today's dollars and adds them up: that sum is the biggest balance those payments can pay off over the term. When the APR is 0%, there is no interest to discount, so the loan is simply payment × number of months.
Your maximum car price is that loan plus your down payment plus your trade-in value, since both reduce the amount you need to borrow. The tool also shows the interest portion of your first payment (remaining balance × monthly rate) so you can see how much of an early payment goes to the lender rather than to principal. Because early payments are mostly interest on a long, high-rate loan, stretching the term to afford a pricier car can mean paying a large share of your budget to interest for years.
If you enter a monthly income, the calculator compares your budgeted payment to 15% of that income — a widely cited ceiling for keeping a car payment sustainable — and flags when your budget exceeds it. It also charts the maximum price at 48-, 60-, and 72-month terms from the same formula, so you can see the trade-off directly: a longer term lifts the price you can reach today but raises the total interest you pay over the life of the loan.
Frequently asked questions
Does the max price include insurance, fuel, and maintenance?+
No. This calculator answers a narrow question: how large a loan and purchase price your chosen monthly payment can finance. The true cost of owning a car goes well beyond the loan — insurance, fuel or charging, registration and taxes, tires, routine maintenance, and eventual repairs all land on top of the payment. A car that fits your loan budget can still be unaffordable once those running costs are added. Before committing, price out insurance for the specific vehicle and set aside a monthly cushion for fuel and upkeep, and treat this result as the financing ceiling rather than a total-cost-of-ownership figure.
Is the 15%-of-income rule a hard limit?+
It is a guideline, not a rule. The idea that your car payment should stay at or below roughly 15% of your gross monthly income is a common rule of thumb for keeping transportation costs manageable, and some budgets cap all vehicle costs — payment, insurance, and fuel combined — closer to 20%. But the right number depends on your other obligations: rent or mortgage, existing debt, savings goals, and how essential the car is to your income. Use the check as a sanity flag, not a verdict, and lean more conservative if your other fixed costs are already high.
Why does a longer loan let me afford a more expensive car?+
Spreading the same payment over more months lets it pay off a larger balance, so a 72-month term supports a higher price than a 48-month term for the identical monthly budget. The catch is total interest: a longer term means more payments and more months of accruing interest, so you pay substantially more overall for the same car, and you spend longer owing more than the vehicle is worth. The extra reach a long term gives you is borrowed from your future — use the shortest term whose payment you can comfortably afford, and compare the term scenarios before deciding.