How to Use Loan Affordability Calculator
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1. Set Your Budget
Enter either your target monthly payment or your annual household income to establish your budget ceiling.
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2. Enter Debt & DTI Parameters
Add your other monthly debt payments and adjust the DTI (Debt-to-Income) limit to reflect lender requirements.
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3. Calculate Borrowing Power
Set the interest rate and loan term to see your maximum affordable loan principal and total cost of borrowing.
The Technical Details
This interactive web utility provides fast, reliable, and completely private data transformations. In modern workflows, quick formatting, conversions, or estimations are essential. By running all logic entirely in your browser with client-side JavaScript, this tool guarantees that your data never leaves your machine. This approach delivers maximum performance and absolute data privacy, as no information is ever sent to a server.
Frequently Asked Questions
What is the DTI (Debt-to-Income) ratio?
DTI is the percentage of your gross monthly income going toward debt payments. Most lenders prefer a DTI below 36–43%. A lower limit gives a more conservative borrowing estimate.
Which calculation mode should I use?
Use the target monthly payment mode if you know your exact monthly budget. Use the income-based mode to let standard DTI rules determine your ceiling based on household earnings.
Is my data sent to a server?
No. All calculations run locally in your browser. Your financial information is never uploaded or stored anywhere.
Does this account for property taxes or insurance?
The calculator estimates the principal loan amount based on payment budget alone. For mortgages, factor in additional costs like property taxes, insurance, and HOA fees before deciding.