Debt
Loan Affordability Calculator
Shoppers ask "what does this cost per month" and then stretch to fit the payment — backwards. The sturdier question is: given the payment my budget can actually carry, how much loan does that buy? This calculator answers it exactly, then shows what stretching the term really costs.
Results
Max loan amount: $22,457.39, Total price you can pay: $25,457.39, Interest over the term: $4,542.61
- Max loan amount
- $22,457.39
- Borrowable within $450.00/mo at 5 years
- Total price you can pay
- $25,457.39
- Max loan plus your down payment
- Interest over the term
- $4,542.61
- Total paid $27,000.00 minus the loan itself
Same budget, different terms
| Term | Max loan | Total interest |
|---|---|---|
| 3 years | $14,466.56 | $1,733.44 |
| 5 years ← your term | $22,457.39 | $4,542.61 |
| 10 years | $37,910.13 | $16,089.87 |
| 15 years | $48,543.04 | $32,456.96 |
| 20 years | $55,859.46 | $52,140.54 |
| 30 years | $64,357.93 | $97,642.07 |
- The loan amount is what your monthly budget can carry at the entered rate and term — the sticker price it supports is that plus the down payment.
- Taxes, fees, and insurance are not inside the payment: sales tax and registration on a car, property tax, homeowners insurance, PMI, or HOA on a home. Budget those on top before you shop.
- Stretching the term buys a bigger loan at a steep price — the comparison table shows the same payment buying more principal while interest quietly multiplies.
- The result is guaranteed honest: the standard payment on $22,457.39 never exceeds $450.00 a month.
- Your actual rate depends on your credit profile — the DTI calculator models the capacity side a lender checks alongside it.
How to use this calculator
- Decide the monthly payment your budget can honestly carry — the number that survives rent, groceries, and an emergency, not the number that works on a good month.
- Enter the APR you expect. Unsure? Ask your bank or credit union for a pre-qualification: it quotes a real rate without a hard credit pull.
- Enter the term in years — 3–7 is typical for a car, 15–30 for a mortgage.
- Add your down payment to see the total sticker price your budget supports, and read the comparison table before you let a dealer pick your term.
How the calculation works
max loan = payment × (1 − (1 + r)^−n) ÷ r, r = APR ÷ 12, n = months max price = max loan + down payment total interest = payment × n − max loan
The present value of an ordinary annuity — the same equation the loan payment tool uses, solved backwards. The result is the largest loan (to the cent) whose standard payment never exceeds your budget; zero-percent financing simply multiplies payment × months.
Worked example
Input
Monthly budget: $450. APR: 7.5%. Term: 5 years (60 months). Down payment: $3,000.
Result
Max loan: 450 × (1 − 1.00625⁻⁶⁰) ÷ 0.00625 = $22,457.39 — the payment on exactly that loan rounds to $450.00. Total price with the down payment: $25,457.39. Interest over 5 years: $4,542.61. Stretching to 8 years would buy a $32,411.71 loan but more than double the interest ($10,788.29).
Assumptions and important notes
- A standard amortizing loan (fixed payment, fixed APR) — not a credit card, balloon, or variable-rate structure.
- Taxes, dealer fees, registration, insurance, PMI, and HOA dues are excluded; the payment covers principal and interest only.
- The quoted APR is assumed accurate for your credit profile; lenders price individually.
- The result is the mathematical maximum, not lending advice — lenders also apply debt-to-income limits the DTI calculator on this site models.
Frequently asked questions
Why does a longer term get me a bigger loan?
Your payment splits between interest and principal each month. A longer term means each payment carries less principal per dollar, so the same payment can service more debt — but you pay interest for more months. The comparison table makes the trade explicit: 5 years buys $22,457 for $4,543 of interest; 30 years at the same payment buys $64,358 for $97,642.
Does this include taxes and fees?
No — deliberately. Car loans carry sales tax, title, and registration; mortgages carry property tax, insurance, and possibly PMI or HOA dues. Lenders often roll some of these into the loan; this tool keeps them out so you can budget them explicitly instead of discovering them at signing.
What if I get a zero-percent APR offer?
Enter 0: the math becomes payment × months, so $450 for 60 months buys $27,000 flat. Zero-percent deals usually forgo a cash rebate that would shrink the loan — compare both paths with the loan payment calculator before choosing.
Why might a bank approve me for less than this?
Because affordability has two ceilings: the payment math (this tool) and your debt-to-income ratio (the lender's tool). If your existing obligations already push DTI past their guideline, the loan shrinks or gets declined regardless of the payment math — check the DTI calculator next.
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