28/36 Rule Calculator
Apply the 28/36 housing debt-to-income rule to determine how much house you can afford. Calculate front-end and back-end DTI ratios with instant results and charts.
About This Calculator
The 28/36 Rule Calculator helps you determine how much house you can afford by applying the standard mortgage affordability guideline used by lenders worldwide. The rule states that your monthly housing costs should not exceed 28% of your gross monthly income (the front-end ratio), and your total monthly debt payments — including housing — should not exceed 36% of your gross monthly income (the back-end ratio). This calculator gives you both ratios instantly, along with maximum affordable payment limits and visual charts.
How the 28/36 rule works: The front-end ratio is calculated by dividing your monthly housing costs (mortgage principal, interest, property taxes, and insurance — known as PITI) by your gross monthly income. The back-end ratio adds all other recurring debt payments (car loans, student loans, credit cards, personal loans) to housing costs before dividing by income. If your front-end ratio is at or below 28% and your back-end ratio is at or below 36%, you meet the standard threshold that most conventional mortgage lenders look for. For example, with a monthly income of ₹1,00,000, your housing costs should ideally stay below ₹28,000 and total debts below ₹36,000.
Regional Application
- India: Indian lenders use FOIR (Fixed Obligation to Income Ratio) rather than the strict 28/36 rule. Most banks cap total EMI obligations at 50-60% of net monthly income. The 28/36 guideline is still useful as a more conservative personal benchmark for housing affordability.
- United States: The 28/36 rule originated in US mortgage lending. Conventional loans require front-end DTI below 28% and back-end below 36%. FHA loans allow up to 31% front-end and 43% back-end. VA loans have soft limits but prefer under 41% back-end.
- United Kingdom: UK lenders primarily use income multiples (4-4.5x annual salary) and stress-test affordability at 3% above the reversion rate per FCA requirements. The 28/36 rule serves as a useful personal affordability check for UK homebuyers.
Features
- Instant front-end and back-end DTI ratio calculation
- Automatic pass/fail assessment against 28% and 36% thresholds
- Maximum affordable housing payment at 28% of income
- Maximum total debt limit at 36% of income
- Visual bar chart comparing your ratios against thresholds
- Income allocation pie chart
- Shareable calculation links via URL state
- Multi-region defaults and currency support (India, US, UK)
Frequently Asked Questions
What is the 28/36 rule?
The 28/36 rule is a mortgage affordability guideline stating that your monthly housing costs should not exceed 28% of your gross monthly income (front-end ratio), and your total monthly debt payments including housing should not exceed 36% of your income (back-end ratio). Lenders use this rule to determine how much mortgage you can afford.
How is the front-end ratio calculated?
The front-end ratio is calculated by dividing your monthly housing costs (mortgage principal, interest, property taxes, and insurance — also known as PITI) by your gross monthly income, then multiplying by 100. For example, if your housing costs are $1,200 and your monthly income is $5,000, your front-end ratio would be 24%, which is below the 28% threshold.
How is the back-end ratio calculated?
The back-end ratio includes all monthly debt obligations: housing costs plus other debts like car loans, student loans, credit card minimum payments, and personal loans. It is calculated by dividing total monthly debt by gross monthly income and multiplying by 100. A back-end ratio below 36% is considered healthy for mortgage approval.
What housing costs are included in the 28% limit?
Housing costs in the 28% limit include mortgage principal and interest, property taxes, homeowner's insurance, and sometimes homeowner association (HOA) fees. These four components are commonly referred to as PITI. Some lenders may also include private mortgage insurance (PMI) when calculating the front-end ratio.
Does the 28/36 rule apply in India?
In India, banks and housing finance companies use a similar concept called FOIR (Fixed Obligation to Income Ratio) rather than the strict 28/36 rule. Indian lenders typically cap total EMI obligations at 50-60% of net monthly income, which is more lenient than the 36% back-end limit. The 28/36 rule is a US-centric guideline, but the principle of limiting housing costs relative to income applies globally.
Does the 28/36 rule apply in the UK?
UK lenders use an income multiple approach (typically 4-4.5x annual income) alongside affordability stress tests, rather than the strict 28/36 rule. The Financial Conduct Authority (FCA) requires lenders to stress-test mortgage affordability at 3% above the standard rate. However, the 28/36 principle is still a useful personal guideline for UK borrowers to assess housing affordability.
Can I get a mortgage if my ratios exceed 28/36?
Some lenders may approve mortgages even if your ratios exceed the 28/36 guideline, especially with strong compensating factors like a high credit score, large down payment, substantial savings, or stable employment history. FHA loans allow up to 43% back-end DTI in some cases. However, exceeding the 28/36 rule means a higher financial burden and may lead to difficulty saving or managing unexpected expenses.
How can I improve my 28/36 rule ratios?
To improve your 28/36 ratios, you can increase your income through raises or side income, reduce your housing costs by choosing a less expensive home or refinancing to a lower rate, pay down existing debts like credit cards and loans, or increase your down payment to lower the mortgage amount needed. Each of these actions reduces either the numerator or increases the denominator of your DTI ratios.