Loan Affordability Calculator – How Much Can I Afford?
Calculate how much you can afford to borrow for any purpose based on your Debt-to-Income (DTI) ratio and monthly budget.
Related Calculators
What is this calculator?
A lender-style affordability estimate that ties income, debts, and housing costs (PITI) into a safe monthly payment range. For related decisions, compare with Dollar Cost Averaging (DCA), Should I refinance Calculator, Advanced Loan Calculator, 150k Mortgage Calculator.
How it works
Inputs map to common U.S. underwriting checkpoints: front-end and back-end DTI limits, plus housing-cost assumptions (taxes, insurance, PMI).
Example calculation
Example: $120,000/year income with $800/month other debts. A 28% front-end target implies about $2,800/month for housing (PITI). A 36% back-end target implies about $3,600/month total debt, keeping housing near $2,800/month. Takeaway: Use a conservative input set and treat that result as the real ceiling, not the best-case result.
When should you use this
- If your interest rate quote is above ~6.5%, stress-test a 0.5–1.0% increase and set your ceiling from the conservative case.
- If you plan to move within ~5 years, prioritize cash-flow safety and reserves over a higher headline purchase price.
- If DTI is near 36%+, compare “pay down debt” vs. “increase down payment” and see which unlocks more buying power.
When this may NOT be ideal
- If you do not have realistic property tax/insurance/HOA numbers for your area yet.
- If income is irregular and your lender will average multiple years or apply overlays.
Tips to get better results
- Run a conservative scenario (higher taxes/insurance and a slightly higher rate) and treat it as the ceiling.
- If DTI is tight, reduce revolving debt first; underwriting outcomes often improve quickly.
- Keep reserves in the plan—max approval can be fragile when escrow rises.
How We Calculate Results
Results combine DTI constraints with a housing-cost budget model. Mortgage payment estimates use amortization math for principal + interest; taxes and insurance are treated as budget inputs.
Financial Decision Guidance
Approval is not affordability. Choose a payment that protects emergency savings and retirement contributions, then treat refinancing as optional upside.
Limitations of This Calculator
- DTI caps vary by lender and loan program; this is an estimate, not underwriting.
- Local taxes/insurance/HOA can materially change outcomes.
Common Mistakes to Avoid
- Targeting the maximum limit instead of a sustainable payment with buffer.
- Forgetting PMI/HOA/insurance increases and being surprised by escrow adjustments.
- Assuming a refinance is guaranteed; qualify at today’s rate first.
Best vs. Worst Case Scenarios
Realistic outcomes based on common decision paths.
Best Case Scenario
Outcome: You purchase a property safely 15-20% *below* your absolute maximum budget. This provides vital cash-flow buffer for unexpected home repairs, tax hikes, or life emergencies, allowing you to simultaneously fund your 401(k) and maintain high liquidity.
Worst Case Scenario
Outcome: You max out your debt-to-income (DTI) ratio. 45% of your gross income now goes to your mortgage. Your cash flow is suffocated ('house poor'), and a single missed paycheck or a sudden $5,000 roof repair forces you into high-interest credit card debt or even risks foreclosure.
Decision Matrix: Which path is right for you?
- Is your resulting Front-End DTI below 28%? → You are in the 'safe zone' for housing affordability according to major lenders.
- Are you projecting high maintenance/HOA costs? → Lower your target purchase price manually from the calculator's 'Max' output.
- Does buying drain your entire savings account? → It is highly inadvisable to close if you won't have a 3-month emergency fund left over after down payment and closing costs.
Disclaimer: The tools and calculators on this page are provided for educational and informational purposes only and do not constitute professional financial or medical advice.
2026 General Loan Master Guide: Calculating Your True Borrowing Power
Whether you’re consolidating debt or financing a major purchase, the real question isn’t “How much can I get approved for?”—it’s “What payment can I carry without sacrificing savings and stability?” Most lenders begin with a payment-to-income lens (DTI). This calculator turns that underwriting logic into a decision tool: estimate a loan size that keeps your monthly payment inside a conservative range so you don’t crowd out essentials, emergency savings, and long-term investing.
The 36% Debt Margin
It depends on your rate, timeline, and constraints. If the result is close, choose the option that preserves liquidity and reduces regret.
APR Sensitivity in 2026
It depends on your rate, timeline, and constraints. If the result is close, choose the option that preserves liquidity and reduces regret.
Safe Loan Capacity = [ (Gross Income × 0.36) - Existing Debts ] × PV Factor(rate, term)
Max Loan Capacity by Income (8% APR)
| Annual Income | Monthly Budget | Max Loan (3yr) | Max Loan (5yr) |
|---|---|---|---|
| $50,000 | $1,500 | ~$46,300 | ~$71,200 |
| $100,000 | $3,000 | ~$92,600 | ~$142,400 |