How Much House Can I Afford? Mortgage Calculator Guide
Buying a home is likely the biggest financial decision you'll ever make. Before you start scrolling through listings, the most important question to answer is: "How much house can I actually afford?" This guide covers the rules lenders use, the factors that determine your budget, and how to calculate a realistic home price for your situation.
The 28/36 Rule: The Industry Standard
Most lenders and financial advisors use the 28/36 rule to determine how much you can afford:
- The 28% rule: Your monthly housing costs (mortgage payment, property taxes, insurance, and HOA fees) should not exceed 28% of your gross monthly income
- The 36% rule: Your total monthly debt payments (housing costs + car loans, student loans, credit cards, etc.) should not exceed 36% of your gross monthly income
Example: You earn $80,000/year ($6,667/month gross).
Maximum housing costs: $6,667 × 28% = $1,867/month
Maximum total debt: $6,667 × 36% = $2,400/month
If you have $400/month in other debt payments, your housing budget drops to: $2,400 − $400 = $2,000/month (the 36% limit kicks in before the 28% limit here)
From Monthly Payment to Home Price
Once you know your maximum monthly payment, you can work backward to find the home price you can afford. This depends on your interest rate, loan term, and down payment.
Use our free Mortgage Calculator to plug in your numbers and see exactly what home price fits your budget. Here's a general reference:
| Annual Income | Max Monthly Payment (28%) | ~Home Price (6.5%, 30yr, 10% down) |
|---|---|---|
| $60,000 | $1,400 | ~$220,000 |
| $80,000 | $1,867 | ~$295,000 |
| $100,000 | $2,333 | ~$370,000 |
| $120,000 | $2,800 | ~$445,000 |
| $150,000 | $3,500 | ~$555,000 |
💡 Tip: These are approximate figures. Your actual affordability depends on your specific interest rate, down payment, property taxes, and insurance costs. Use our Mortgage Calculator for a personalized estimate.
Factors That Determine Your Home Budget
1. Gross Income
This is your total income before taxes and deductions. Lenders look at gross income, not take-home pay. If you're buying with a partner, you can combine both incomes — which significantly increases your purchasing power.
2. Down Payment
The more you put down, the less you need to borrow — and the lower your monthly payment. Common down payment amounts:
- 3%–5% — Minimum for conventional loans (may require PMI)
- 10% — A solid middle ground, lower PMI costs
- 20% — The traditional target that eliminates Private Mortgage Insurance (PMI)
PMI typically costs 0.5%–1% of the loan amount per year, adding $50–$200+ to your monthly payment. Getting to 20% down saves you this ongoing cost.
3. Interest Rate
Your mortgage interest rate has a massive impact on what you can afford. Even a 0.5% difference matters:
$300,000 loan over 30 years:
At 6.0%: $1,799/month → Total paid: $647,515
At 6.5%: $1,896/month → Total paid: $682,633
At 7.0%: $1,996/month → Total paid: $718,527
A 1% rate increase costs you an extra $197/month and $71,012 over the life of the loan.
4. Existing Debt
Your debt-to-income ratio (DTI) includes all monthly debt payments. Common debts that count:
- Car loans or leases
- Student loan payments
- Minimum credit card payments
- Personal loans
- Child support or alimony
Paying off debt before buying a home can dramatically increase the mortgage you qualify for. Eliminating a $300/month car payment could add $45,000+ to your home budget.
5. Property Taxes & Insurance
These are part of your total housing cost and eat into your budget. Property taxes vary wildly by location — from under 0.5% in Hawaii to over 2% in New Jersey and Illinois. Homeowner's insurance typically runs $100–$250/month depending on the home value and location.
Hidden Costs First-Time Buyers Often Miss
Your mortgage payment isn't the only cost of homeownership. Budget for these too:
- Closing costs: 2%–5% of the purchase price (paid upfront)
- Maintenance & repairs: Budget 1%–2% of home value per year
- HOA fees: $200–$500+/month for condos and planned communities
- Utilities: Often higher than renting, especially for larger homes
- Moving costs: $1,000–$5,000+ depending on distance
A More Conservative Approach
Just because a lender will approve you for a certain amount doesn't mean you should borrow that much. Many financial planners suggest a more conservative approach:
- Keep housing costs under 25% of take-home pay (not gross income)
- Maintain a 6-month emergency fund after your down payment
- Choose a 15-year mortgage if you can afford the higher payments — you'll pay far less interest
- Keep your total home price under 3× your annual gross income
Run the Numbers for Your Situation
Every home buyer's situation is unique. The best way to figure out what you can afford is to plug your actual numbers into a calculator. Our free Mortgage Calculator lets you adjust the home price, down payment, interest rate, and loan term to see your exact monthly payment. You can also view a full amortization schedule showing how much goes to principal vs. interest each month — essential information for making a confident decision.
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