This is usually the very first question anyone asks before they start looking at homes — and it's also one of the easiest to answer badly with a rough online rule of thumb. Here's how it actually works.
It starts with your income, but it's not just your income
Lenders look at your total monthly debt obligations — car payments, student loans, credit cards, and the like — alongside your income, commonly expressed as your debt-to-income ratio (DTI). This is one of the main factors used to determine what monthly payment you can comfortably support, and it's different for everyone depending on what other debt you're carrying.
The purchase price isn't the only number that matters
Your monthly payment includes more than principal and interest. Property taxes, homeowners insurance, and (depending on your loan and down payment) mortgage insurance all factor in, and if you're buying a condo or in an HOA community, those dues add another line item. Two homes at the same price can have very different real monthly costs depending on these factors.
Your down payment changes more than just your upfront cost
A larger down payment doesn't just reduce how much you're borrowing — it can also affect your interest rate, whether you pay mortgage insurance, and how much cash reserve you have left after closing. There's a balance between putting enough down to strengthen your position and keeping enough in reserve for moving costs, repairs, and general financial breathing room.
Why a calculator is a starting point, not the final answer
A payment calculator is genuinely useful for getting a rough sense of how loan amount, rate, and term interact — try ours below to see how the numbers move. But it can't account for your actual debt-to-income ratio, credit profile, or which loan program fits your situation. That's what pre-approval is for: it turns a rough estimate into a real, underwritten number.
The honest answer
"How much house can I afford" really has two answers: what a lender will approve you for, and what you're personally comfortable paying every month. Those aren't always the same number, and the right one is usually somewhere you land after an honest look at your full financial picture — not just a maximum loan amount.