finance calculator
Estimate how much home you can realistically afford based on income, debt, down payment, and current mortgage interest rates.
Home affordability is usually set by two debt-to-income limits: housing costs at or below 28% of gross monthly income, and total debt payments at or below 36%. On a $90,000 salary, that allows roughly $2,100 a month for housing — which, at 6.5% over 30 years with taxes and insurance, supports a home price near $300,000.
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Affordable home price
$362,612
Tip
Save this page to recalculate your maximum home purchase price as mortgage rates shift, down payments change, or debts are paid off.
Formula
Max housing payment = monthly income x housing ratio - monthly debtThe calculator estimates how much monthly housing payment your income can support, then backs into a home price.
Step by step
Example
With $120,000 income, $500 monthly debt, and $80,000 down, the default assumptions estimate a home price near the high $300,000s.
Related guides
Guide
Estimate a home-price range from income, debt, down payment, rate, taxes, and insurance, then test costs the DTC model does not include.
Guide
Understand how mortgage payments work, what the DTC mortgage calculator includes, and how taxes, insurance, PMI, and loan term affect cost.
Guide
Build a realistic down payment plan by including closing costs, savings pace, PMI tradeoffs, and the cash cushion you still need after closing.
Summary
Affordable price
$362,612
Estimated buying power from current assumptions.
Max payment
$2,300
Monthly housing capacity after debt.
Estimated loan
$282,612
Home price minus down payment.
Monthly income
$10,000
28% housing ratio target.
D3 visualization
See how the estimated purchase price splits between down payment and loan amount.
D3 visualization
Compare income, existing monthly debt, and estimated housing payment capacity.
Guide
Enter your annual income, existing monthly debt payments, down payment, expected mortgage rate and term, property tax and insurance rates, and your target housing-ratio limit.
The calculator converts your income into a maximum monthly housing payment under that ratio, backs out taxes and insurance to isolate the principal-and-interest capacity, and uses standard loan math to convert that capacity into a maximum affordable home price.
Annual income $120,000, monthly debt $500, down payment $80,000, 6.5% mortgage rate, 30-year term, 1.2% property tax rate, 0.5% insurance rate, 28% maximum housing ratio.
Monthly income: $120,000 ÷ 12 = $10,000.
Maximum monthly housing payment: ($10,000 × 28%) − $500 = $2,300.
Affordable home price (after backing out taxes, insurance, and financing the remainder at 6.5% over 30 years, then adding back the down payment): ≈ $362,611.95.
Estimated loan amount: $362,611.95 − $80,000 ≈ $282,611.95.
That $500 in existing monthly debt directly reduced buying power — clearing it would free up the full $2,800 housing-ratio cap instead of $2,300, meaningfully raising the affordable price range.
Before shopping for a home, you must understand how financial institutions evaluate your borrowing capacity. Lenders rely on strict debt-to-income (DTI) ratios to determine the maximum loan amount they will approve.
DTI ratios are split into two categories: front-end ratio and back-end ratio. The front-end ratio represents the percentage of your gross monthly income dedicated strictly to housing expenses (PITI + HOA). The back-end ratio includes housing costs plus all recurring monthly debts (credit cards, student loans, auto payments, child support).
Lenders traditionally apply the "28/36 rule," where housing costs should not exceed 28% of gross monthly income, and total debts should not exceed 36% of gross monthly income. Some loan programs allow higher limits (up to 45% or 50% for FHA/VA loans) depending on compensating factors such as cash reserves or high credit scores.
Before running numbers here, it's worth checking your own front-end and back-end ratios directly with the debt-to-income ratio calculator — it applies the same 28/36 logic to your actual current debt load and will tell you exactly how much room (if any) you have before adding a new housing payment.
Home buyers often focus solely on the list price of the property, but interest rates and property taxes have a massive effect on total purchasing power. A small change in either variable can dramatically alter the price range you can afford.
For example, when interest rates rise, a larger portion of your fixed monthly payment capacity goes toward paying interest instead of paying down principal. This forces your maximum affordable home price downward, even if your income remains unchanged.
Similarly, properties in high-tax municipalities will have a lower maximum purchase price under the same DTI limit, because the escrowed tax portion consumes a larger share of the monthly housing capacity.
To calculate your affordable home price, this tool operates in reverse compared to a standard mortgage calculator. It starts with your income and debt, applies DTI ratio limits to find your maximum monthly payment capacity, and then backs into the purchase price.
Step 1: Calculate Gross Monthly Income: Monthly Income = Annual Income / 12.
Step 2: Calculate Front-End Payment Cap: Cap_(Front) = Monthly Income × Front-End Ratio.
Step 3: Calculate Back-End Payment Cap: Cap_(Back) = (Monthly Income × Back-End Ratio) - Monthly Debt.
Step 4: Determine Maximum Monthly Housing Budget: Max Monthly Payment = min(Cap_(Front), Cap_(Back)).
Step 5: Back out taxes, insurance, and HOA dues to find the remaining capacity for Principal and Interest (P I).
Step 6: Use the amortizing loan math to calculate the maximum loan principal supported by the P I capacity: P = M_(P I) × ((1+r)^n - 1)/(r(1+r)^n). Finally, add the Down Payment to the maximum loan principal to output the total affordable home purchase price.
Your total buying power is constrained by both your monthly income capacity and your available cash reserves. A common mistake is allocating 100% of liquid savings to the down payment.
In addition to the down payment, buyers must pay closing costs, which range from 2% to 5% of the loan amount (origination fees, appraisals, title insurance, escrow prepaids). Lenders also require reserves (liquid cash left over after closing, usually equivalent to 2 to 6 months of mortgage payments) to prove financial stability.
Just because a bank approves you for a mortgage of a certain size does not mean you should borrow that amount. Lender guidelines do not account for personal lifestyle expenses such as travel, retirement savings, private school tuition, groceries, or utilities.
To maintain financial stability and avoid becoming "house poor," structure your personal budget target below the maximum approved limit. Focus on a monthly payment that feels comfortable relative to your net take-home pay, rather than gross pre-tax income.
Once you have an affordable price range, run it through the mortgage calculator for the full PITI breakdown, use the down payment calculator to plan your savings timeline, and compare the ongoing cost of owning against renting with the rent vs. buy calculator. This calculator answers the buyer-side question specifically — if you're deciding whether to rent instead, the rent affordability calculator runs the equivalent renter-side budget from your income and debt.
Debt-to-Income (DTI)
The percentage of gross monthly income used to pay recurring monthly debts, used by lenders to evaluate risk.
Escrow Reserve
Prepaid tax and insurance funds collected at closing and held by the lender to cover initial bills.
Buying Power
The maximum purchase price a buyer can afford based on income, debt, rates, and cash reserves.