PMI Calculator

What Is Private Mortgage Insurance (PMI)?

Private mortgage insurance is a type of insurance that lenders require from borrowers when the down payment on a home is less than 20% of the purchase price. PMI protects the lender—not you—in case you default on the loan. It allows buyers to purchase a home with a smaller down payment, but it adds a monthly cost to your mortgage payment.

This calculator estimates your monthly PMI cost based on your loan amount, down payment, and home price. It helps you understand how much this additional expense will add to your housing budget before you commit to a loan.

How PMI Is Calculated

PMI rates typically range from 0.3% to 1.5% of the original loan amount per year. The exact rate depends on several factors:

• Loan-to-value ratio (LTV): The higher your LTV (the smaller your down payment), the higher your PMI rate.
• Credit score: Borrowers with higher credit scores generally qualify for lower PMI rates.
• Loan type: Conventional loans have different PMI structures compared to FHA loans (which use MIP).
• Property type: Owner-occupied primary residences typically have lower rates than investment properties.

The standard formula used by this calculator is:

Annual PMI = Loan Amount × PMI Rate

Monthly PMI = Annual PMI ÷ 12

The calculator applies a default PMI rate based on your down payment percentage. A 5% down payment results in a higher rate than a 15% down payment. You can adjust the rate manually if you have a specific quote from your lender.

How to Use This PMI Calculator

1. Enter the home price — the total purchase price of the property.
2. Enter your down payment — the amount you plan to put down, either as a dollar amount or a percentage.
3. Enter the loan amount — this is typically the home price minus your down payment. Some calculators auto-fill this.
4. Adjust the PMI rate if you know your specific rate from a lender. Otherwise, the calculator uses an estimate based on your down payment size.

The result shows your estimated monthly PMI payment and the annual cost. Use this figure to determine your total monthly housing expense including principal, interest, taxes, and insurance.

Example Calculation

Scenario: You want to buy a home priced at $350,000. You have $35,000 saved for a down payment (10%). Your loan amount is $315,000.

With a 10% down payment, your LTV is 90%. A typical PMI rate for this scenario might be around 0.8% annually.

• Annual PMI: $315,000 × 0.008 = $2,520
• Monthly PMI: $2,520 ÷ 12 = $210

This means you would pay approximately $210 per month for PMI on top of your principal and interest payment. Once your loan balance reaches 80% of the home's value, you can request cancellation of PMI.

Understanding Your Results

The calculator provides two key figures:

• Monthly PMI: The amount added to each mortgage payment. This is the figure you'll see on your loan estimate and closing disclosure.
• Annual PMI: The total yearly cost. This helps you compare the total cost of different down payment scenarios.

Remember that PMI is not a fixed cost for the life of your loan. It automatically terminates when your LTV reaches 78% of the original property value, or you can request cancellation at 80% LTV. The calculator assumes the initial PMI rate and does not account for future rate changes or early cancellation.

Common Mistakes When Estimating PMI

• Using the wrong loan amount: PMI is based on the loan amount, not the home price. Ensure you subtract your down payment correctly.
• Assuming a single PMI rate: Rates vary significantly by lender, credit score, and loan program. The calculator's default rate is an estimate—your actual rate may differ.
• Forgetting about upfront PMI: Some loans require a one-time upfront PMI premium in addition to monthly payments. This calculator only estimates monthly PMI.
• Ignoring PMI cancellation: PMI is not permanent. Factor in that you can cancel it once you reach 20% equity, which reduces your long-term housing costs.

Limitations of This Calculator

This PMI calculator provides estimates for conventional loans only. It does not account for:

• FHA mortgage insurance premiums (MIP), which have different rules and rates.
• VA loans, which do not require PMI.
• USDA loan guarantee fees.
• Lender-paid PMI (LPMI) arrangements where the lender pays PMI in exchange for a higher interest rate.
• Credit score adjustments — the calculator uses a default rate based on down payment alone.

Always consult with a mortgage lender for a precise PMI quote based on your specific financial profile and loan program.

Practical Use Cases

• Budgeting for a home purchase: Determine if you can afford the total monthly payment including PMI before you start house hunting.
• Comparing down payment scenarios: See how a larger down payment reduces or eliminates PMI, helping you decide how much to put down.
• Evaluating refinance options: If your home has appreciated, refinancing to eliminate PMI may save you money each month.
• Rent vs. buy analysis: Factor PMI into your total housing cost to make an informed decision about whether buying is right for you now.