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How to Use This Mortgage Calculator
Our free mortgage calculator helps you estimate your monthly principal and interest payment based on your home price, down payment, interest rate, and loan term. Enter your specific numbers to get an instant calculation, then click Ask AI to get a personalized explanation of whether your mortgage payment fits comfortably within standard lending guidelines.
Understanding Your Mortgage Payment
Your monthly mortgage payment consists of four components known as PITI: Principal, Interest, Taxes, and Insurance. This calculator covers the principal and interest portion. Most lenders recommend keeping your total housing costs including taxes and insurance below 28% of your gross monthly income. This is known as the front-end debt-to-income ratio and is one of the primary factors lenders use when deciding whether to approve your mortgage application.
How Mortgage Interest Works
In the early years of your mortgage the majority of each payment goes toward interest rather than reducing your loan balance. This is called amortization. On a $320,000 mortgage at 6.75% your first payment of $2,076 includes approximately $1,800 in interest and only $276 in principal. By year 15 that split becomes roughly equal. By year 25 the majority of each payment goes toward principal. Understanding this helps explain why making even small extra payments early in your loan saves significant interest over time.
The 20% Down Payment Rule
Putting down 20% of the purchase price eliminates the requirement for Private Mortgage Insurance (PMI). PMI typically costs 0.5% to 1.5% of the loan amount per year and adds $100 to $300 to your monthly payment on a $300,000 loan. If you cannot reach 20% down an FHA loan allows as little as 3.5% down with a credit score of 580 or higher. Conventional loans allow as little as 3% down for qualified buyers.
Frequently Asked Questions
What credit score do I need for a mortgage?
Most conventional lenders require a minimum credit score of 620. FHA loans allow scores as low as 580 with 3.5% down or 500 with 10% down. The higher your score the better interest rate you will receive. A score above 740 typically qualifies you for the best available rates.
How much income do I need for a $400,000 mortgage?
To comfortably afford a $400,000 home with 20% down at current rates you generally need a gross annual income of at least $85,000 to $95,000. This keeps your housing costs within the recommended 28% of gross monthly income guideline used by most lenders.
Is it better to get a 15 or 30 year mortgage?
A 15 year mortgage has a higher monthly payment but you pay significantly less total interest and build equity faster. A 30 year mortgage has lower monthly payments giving you more cash flow flexibility. Most financial advisors recommend the 30 year mortgage if you plan to invest the payment difference in the stock market where returns historically exceed mortgage interest rates over long periods.