House Affordability Calculator
Calculate the maximum house price you can afford based on income, debt, interest rate, down payment, and DTI ratio. Get instant monthly cost breakdowns and charts.
About This Calculator
The House Affordability Calculator helps you determine how much house you can realistically afford based on your income, existing debts, down payment, and local housing costs. Whether you are a first-time home buyer in India, the US, or the UK, this calculator uses the standard debt-to-income (DTI) approach that mortgage lenders use to pre-qualify borrowers.
This calculator follows the widely-used 28/36 rule for its default settings. Your monthly housing budget is calculated as the lower of 28% of your gross monthly income (front-end ratio) or your selected DTI percentage minus existing monthly debt payments (back-end ratio). After deducting estimated monthly property tax, home insurance, and HOA fees, the remaining amount is applied to the standard loan present-value formula to compute the maximum loan you can qualify for. Adding your down payment gives the maximum affordable house price.
Regional Notes
India (IN): Home loan interest rates range from 8.5% to 9.5% depending on credit profile and lender. Most banks offer up to 80-90% of the property value (LTV), meaning a 10-20% down payment is typical. Home loan tenures can extend up to 30 years. The 28/36 rule is a general guideline; Indian lenders evaluate repayment capacity based on FOIR (Fixed Obligation to Income Ratio), usually capped at 50-55%.
United States (US): Conventional loans follow the 28/36 rule strictly, with DTI limits of 28% front-end and 36-43% back-end. FHA loans allow 31/43 ratios, and VA loans allow 41% back-end. Down payments range from 3% (conventional) to 20% (to avoid PMI). Property taxes average 1.1% of home value annually but vary significantly by state.
United Kingdom (UK): UK lenders typically use income multiples (4-4.5x annual income) rather than strict DTI ratios. However, the affordability check includes all committed expenditures. Stamp duty land tax (SDLT) applies on purchases above £125,000 (£300,000 for first-time buyers). Most lenders require a 5-10% deposit, though 20%+ gets better rates.
Frequently Asked Questions
How does the House Affordability Calculator work?
The calculator uses the debt-to-income (DTI) approach to determine how much house you can afford. It calculates your monthly housing budget as the lower of 28% of gross monthly income (front-end ratio) or your selected DTI percentage of income minus existing monthly debts (back-end ratio). It then subtracts estimated monthly property tax, insurance, and HOA fees to find the amount available for principal and interest. Using the standard loan present-value formula, it computes the maximum loan amount you can qualify for, then adds your down payment to arrive at the maximum affordable house price.
Is this calculator free?
Yes, it is completely free to use with no registration required. Your inputs are saved in the URL so you can share and revisit your calculations.
What is the 28/36 rule in house affordability?
The 28/36 rule is a common mortgage qualification guideline used in the US and Canada. It states that a household should spend no more than 28% of its gross monthly income on total housing costs (front-end ratio) and no more than 36% on total debt including the mortgage (back-end ratio). This calculator uses the 28% front-end rule combined with your chosen DTI ratio to determine the maximum housing budget.
What debt-to-income ratio should I use?
For conventional loans, lenders typically prefer a back-end DTI of 36% or lower. FHA loans allow up to 43% back-end DTI, and VA loans allow up to 41%. A lower DTI ratio (25-30%) gives a more conservative estimate and increases your chances of loan approval at favorable rates. Ratios above 43% are generally considered high risk by most lenders.
How much should I put as a down payment?
In India, most lenders require 10-20% down payment for home loans. In the US, conventional loans require as little as 3% down, but 20% avoids PMI. FHA loans allow 3.5% down. In the UK, 5-10% deposits are common for first-time buyers. A larger down payment reduces your loan amount, lowers monthly payments, and often gets you a better interest rate.
Does the calculator include property tax and insurance?
Yes, the calculator includes annual property tax, home insurance, and HOA fees in the total monthly housing cost estimate. These costs are divided by 12 and added to the principal and interest payment to give you a complete picture of your true monthly housing expense. Property tax rates vary by location — the national average in the US is about 1.1% of home value annually.
How is the maximum loan amount calculated?
After determining your monthly budget available for principal and interest, the calculator uses the loan present value formula: P = M x ((1 + r)^n - 1) / (r x (1 + r)^n), where M is the monthly payment available, r is the monthly interest rate, and n is the total number of monthly payments. This computes the maximum loan you can afford given your income, debts, and other housing costs.
Is this calculator accurate for my specific situation?
This calculator provides a general estimate based on standard DTI guidelines. Actual loan approval depends on many factors including your credit score, employment history, asset reserves, and lender-specific requirements. For a precise pre-qualification, consult with a mortgage lender or financial advisor in your region.