About the How Much Can I Borrow Calculator
This loan affordability calculator answers the question lenders ask first: how big a loan does your budget support? Instead of starting from a loan amount, you start from the monthly payment you are comfortable with — or from your income and existing debts — and the calculator works backwards to the maximum amount you can borrow at a given rate and term.
Use it before you shop for a car, a personal loan, a boat or any installment loan so you know your ceiling before a salesperson suggests one. The income mode applies a debt-to-income (DTI) limit: many lenders like total monthly debt payments to stay at or below roughly 36% of gross monthly income, although limits vary by lender and loan type.
The result assumes a fixed-rate loan with equal monthly payments and no balloon. Fees, taxes and insurance are not included, so leave some room in your budget for them.
With the default inputs, the maximum loan amount is $24,659.22. Change any value above to recalculate instantly.
How to use the how much can i borrow calculator
- 1Choose whether to start from a monthly payment or from your income and debts.
- 2Enter the payment you can afford, or your income, debts and a DTI limit.
- 3Enter the interest rate you expect to qualify for.
- 4Choose the loan term in months.
- 5Read the maximum loan and check the table to see how rates change it.
Formula and method
The maximum loan is the present value of the payments you can afford: each future monthly payment is discounted at the loan’s monthly interest rate r (APR ÷ 12) and the results are added up. That is exactly the amount a lender could lend so that n equal payments of M repay it with interest.
In income mode, the affordable payment M is your gross monthly income multiplied by the maximum debt-to-income ratio, minus the debt payments you already make. At a 0% rate the loan is simply M × n.
- M
- Affordable monthly payment
- r
- Monthly interest rate (APR ÷ 12 ÷ 100)
- n
- Number of monthly payments
- DTI
- Debt-to-income limit, as a % of gross monthly income
Worked examples
$500 a month at 8% for 60 months
Sixty payments of $500 total $30,000. Discounting them at 8% APR means they can repay a loan of about $24,659, with the remaining $5,341 going to interest.
$6,000 income, $800 debts, 36% DTI, 7% for 72 months
36% of $6,000 is $2,160 of total debt payments; subtracting the $800 already committed leaves $1,360 a month. Over 72 months at 7% that payment supports a loan of about $79,770.
0% promotional financing: $300 for 48 months
With no interest, the loan you can afford is simply the payment times the number of months: $300 × 48 = $14,400.
Frequently asked questions
How much can I borrow based on my income?+
Lenders look at your debt-to-income ratio. A common ceiling is 36% of gross monthly income for all debt payments combined, so on $6,000 a month with $800 of existing debt you would have about $1,360 a month available for a new loan.
Does a longer term let me borrow more?+
Yes — spreading the same payment over more months supports a larger loan. But total interest rises sharply and you may owe more than the item is worth, so borrow for the shortest term you can manage.
What DTI ratio do lenders accept?+
It varies. Many personal and auto lenders prefer total DTI under about 36%–40%, while some mortgage programs allow up to 43%–50% with strong credit or reserves. Lower is always safer for your budget.
Should I borrow the maximum amount?+
Not necessarily. The maximum is what the math allows, not what is comfortable. Leave room for savings, emergencies, insurance and rising costs — many people aim to borrow well below their limit.
Why does the interest rate change how much I can borrow?+
A higher rate means more of each payment goes to interest, leaving less to repay principal. At the same payment and term, every extra percentage point of APR noticeably reduces the loan you can afford.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.