Built and fact-checked by the DocNectar team — see our editorial standards
Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
Mobile Friendly
Fully responsive design. Works on all devices & screen sizes.
Privacy Focused
Your data stays on your device. We don't store any inputs.
100% Free
No hidden costs. This tool is completely free forever.
The Mortgage Payment Calculator goes from price to payment — this calculator solves the reverse problem: given your income, existing debts, and a target debt-to-income ratio, what's the maximum home price you can reasonably afford?
This calculator applies a back-end debt-to-income limit (existing debts plus the new housing payment, as a share of gross income) to solve for your maximum affordable home price.
How it works
Enter your gross annual income, existing monthly debt payments, down payment, interest rate, loan term, and a maximum debt-to-income ratio (36% is a common default). The tool calculates your maximum monthly housing payment, then works backward to the maximum loan amount and home price.
- Enter gross annual income.
- Enter existing monthly debt payments (optional).
- Enter down payment.
- Enter annual interest rate (%).
- Enter loan term (years).
- Enter max debt-to-income ratio % (optional).
- Click Calculate to see your results.
Examples
Affordability at a 36% DTI limit
A $90,000 income with $400 in existing monthly debts, a $40,000 down payment, and a 36% DTI limit supports a maximum home price of about $403,885.
Who should use it
- Determining a realistic home price range before house hunting.
- Checking how paying down existing debt would increase home buying power.
Industry applications
- Real estate and mortgage lending
- Personal finance and home buying
Advantages
- Solves affordability in the direction most home buyers actually need (income → max price).
- Uses an adjustable DTI limit rather than a single hardcoded assumption.
Limitations
- Doesn't include property tax, insurance, PMI, or HOA fees in the affordability ceiling — pair with the Mortgage Payment Calculator for the full picture.
Common mistakes to avoid
- Treating the maximum affordable price as a comfortable target rather than a hard ceiling based on a specific DTI assumption.
- Not accounting for property tax and insurance, which reduce how much you can actually afford in principal and interest.
Best practices
- Treat the result as an upper bound, not a target — many financial advisors suggest buying below your maximum affordability to leave room for other financial goals.
- Run the resulting loan amount through the Mortgage Payment Calculator to check the full PITI payment, not just principal and interest.
Tips
- Paying down existing monthly debts before applying for a mortgage can meaningfully increase your maximum affordable price, since it directly raises the housing payment room under a fixed DTI limit.