How Much Can I Borrow Calculator
Estimate a loan size from a payment you can manage, then see how the rate and term affect total interest.
- 2026 figures, checked October 26, 2026
- Private: runs in your browser
- How we check our work
Result
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Verify before you act: review these results with a licensed loan officer or a nonprofit credit counselor before making any decision based on them.
Suggestions for your numbers
Updated as you type, from your inputs only. General information, not personal advice; confirm any change with a qualified professional.
See it over time
Hover over or tap the chart to see the numbers for any point.
What is a how much can I borrow calculator?
A how much can I borrow calculator estimates the loan amount a monthly payment can support. It uses your payment, interest rate and loan term to work backward from the installment to the amount borrowed.
The calculation uses the present-value formula for equal payments: Loan amount = payment x (1 - (1 + r)^-n) / r. Here, r is the interest rate per monthly payment period, and n is the number of monthly payments. For an annual rate and monthly payments, the calculation uses the annual rate divided by 12. This is a useful estimate, not a lender’s approval or offer.
Why your estimated borrowing amount matters
A payment you can afford is not the same as a loan amount a lender will approve. The estimate helps you set a borrowing target before you shop, apply or negotiate. You can compare that target with your take-home pay, existing debt and the cash you need for other bills.
The result can also help you compare financing choices. A higher rate means less of each payment goes toward principal, so the payment supports a smaller loan. A longer term can support a larger loan at the same payment, but paying for longer generally increases total interest on the same amount borrowed and rate.
Use the estimate when planning a car purchase, home project or other large expense. If the payment strains your budget, consider a less expensive purchase, a larger down payment, or waiting while you build savings. For a fuller monthly picture, pair this estimate with a budget or debt payoff calculator.
How to use this loan amount calculator
- Enter the monthly payment you can reasonably fit into your budget. Base it on your regular cash flow, not on the largest payment a lender might accept.
- Enter the interest rate you expect to receive. If you are comparing offers, use each offer’s rate in turn and keep the payment and term unchanged to see how the estimated loan amount changes.
- Enter the loan term in years. Use the term you are considering, not simply the longest term available.
- Review the estimated loan amount and total interest. Treat the loan amount as a planning figure. Fees, lender requirements and your financial details can change the actual offer.
Example: what a $600 monthly payment supports
Worked example
With a monthly payment of $600, an interest rate of 8% and a term of 5 years, the calculator estimates a loan amount of $29,591. The result summary is “At $600.00 a month for 5 years.” It shows a $600.00 monthly payment, an 8% rate, a $29,591 loan amount and $6,409 in total interest. The estimate applies the fixed-payment formula across the monthly payment periods.
How to read your borrowing result
The loan amount is the estimated principal the payment can support under the inputs you entered. It is not necessarily the amount you should borrow, and it does not confirm that you qualify. A lender may assess income, current debts, credit history, collateral and other details.
Total interest is the estimated cost of borrowing over the term, separate from the principal. It does not necessarily include fees, taxes, insurance or other charges. Ask the lender which costs are included in a payment quote and compare offers using the same term and payment assumptions.
How to improve the amount your payment can support
- 01
Compare rates from lenders
Ask lenders for written estimates and compare the rate, fees and term, not just the advertised payment. A lower rate can let the same payment support more principal or reduce interest on the amount you need.
- 02
Choose a payment that fits your real budget
Review recurring bills, debt payments and savings before setting a payment. If the estimate is too low for the purchase, adjust the purchase plan rather than relying on a payment that leaves too little room for other needs.
- 03
Consider a larger down payment
If you can make a larger down payment without draining cash needed for bills or emergencies, you may need to borrow less. Recalculate using the payment and term you can sustain.
- 04
Compare a shorter term carefully
A shorter term can reduce the time interest accrues, but it also requires a higher monthly payment for the same loan amount and rate. Check that the higher payment fits before choosing it.
Common loan amount calculator mistakes
Treating the estimate as an approval
The formula only estimates what a payment supports. A lender makes its own decision after reviewing your application and the loan details.
Entering the wrong rate
Use the rate that applies to the offer you are evaluating. If the rate is variable or the quote includes fees, the actual cost may not match this fixed-rate estimate.
Focusing only on the monthly payment
A payment can look manageable because the term is long, while the total interest is higher. Review both the payment and total borrowing cost before deciding.
Leaving out other costs
The calculator estimates principal and interest from your inputs. Check separately for fees, insurance, taxes and any other required costs.
The loan amount formula
Loan amount = payment x (1 - (1 + r)^-n) / r.
Key terms
- Principal
- The amount borrowed, before interest and any added charges.
- Interest rate
- The rate used to calculate the cost of borrowing. This calculator applies it to the payment periods in its formula.
- Loan term
- The period over which the scheduled loan payments are made.
- Total interest
- The estimated interest paid over the loan term, separate from the principal.
Loan amount questions
Does this result guarantee that I can borrow the amount shown?
No. It is a payment-based estimate, not an approval. Lenders review your application, finances and the loan terms before making an offer.
Does the calculator include fees or insurance?
The formula estimates a loan amount from the payment, rate and term. It does not identify or add fees, insurance, taxes or other charges, so check how a lender defines its quoted payment.
How does a higher interest rate affect the estimate?
With the payment and term held constant, a higher rate means the payment supports a smaller principal amount because more of the payment goes toward interest.
Should I borrow the full amount shown?
Not automatically. Compare the payment with your full budget and other financial priorities. Borrow only what fits your needs and ability to repay.
Before you act on this result. Cordwell calculators and guides are educational estimates, not legal, tax, investment, lending or other professional advice. They rely on the numbers you enter and on simplified rules, and they can't see your full situation. Before you file, sign, borrow, invest, hire, change your withholding or form a business based on anything here, meet with a licensed loan officer or a nonprofit credit counselor who can review your specific facts and confirm the numbers. Rules change, and official agency guidance always controls.