How to Use House Affordability Calculator
The House Affordability Calculator delivers fast, transparent calculations with a clear step-by-step output.
- Enter your annual income and existing monthly debts.
- Provide down payment, mortgage rate, term, and tax rate.
- Optionally add insurance, HOA, and PMI rate.
- See the affordable price, loan amount, and full housing cost breakdown.
Formula & Theory — House Affordability Calculator
The classic 28/36 rule limits housing to 28% and total debt to 36% of gross monthly income. The House Affordability Calculator uses bisection to find the maximum price that satisfies both constraints given local taxes, PMI, and other costs.
Housing cap = Income / 12 × 28%
DTI cap = Income / 12 × 36% − existing debt
Solve price s.t. P&I + tax + insurance + PMI + HOA ≤ min(caps)| Symbol | Meaning |
|---|---|
| 28% | Front-end housing ratio |
| 36% | Back-end DTI ratio |
| PMI | Private mortgage insurance (LTV > 80%) |
| HOA | Monthly HOA dues |
Use Cases for House Affordability Calculator
- First-time buyers setting a home-search budget.
- Mortgage brokers pre-qualifying borrowers quickly.
- Relocation services advising on new-city budgets.
- Financial advisors building cash-flow plans.
- Students learning DTI and underwriting basics.
- Couples merging finances and planning a purchase.
Whether you are a homeowner, investor, or analyst, the House Affordability Calculator produces instant results with formulas and explanations you can rely on.