PMI Calculator How to Estimate Your Monthly PMI Cost and When It Ends

PMI Calculator: How to Estimate Your Monthly PMI Cost and When It Ends

Putting less than 20% down on a home usually means paying private mortgage insurance. It can add hundreds of dollars to your monthly payment, and many buyers don’t see the number until late in the process. A PMI calculator gives you the estimate up front, so you can budget properly and plan when the cost goes away.

This guide covers the PMI formula, what drives your rate, worked examples, and the rules for removing PMI.

What Is PMI?

Private mortgage insurance (PMI) is a policy on a conventional loan that protects the lender, not you, if you stop making payments. Lenders typically require it when your down payment is below 20% of the home’s price.

PMI doesn’t protect your home or your credit if you fall behind. Its job is to make low-down-payment loans possible, which is why it’s a cost many buyers accept in exchange for buying sooner.

What Does a PMI Calculator Do?

The free PMI calculator takes your home price, down payment, PMI rate, interest rate, and loan term. It then estimates:

Your monthly PMI cost
Your current loan-to-value ratio (LTV)
How many months until you reach 80% LTV, when you can request removal
The approximate total PMI you would pay

The PMI Formula

PMI is quoted as an annual percentage of your loan amount, then split into 12 payments:

Annual PMI = Loan amount × PMI rate
Monthly PMI = Annual PMI ÷ 12

Example: A $400,000 home with 10% down means a $360,000 loan. At a 0.75% PMI rate:

Annual PMI: $360,000 × 0.0075 = $2,700
Monthly PMI: $2,700 ÷ 12 = $225

How Much Is PMI? Typical Rates

Most borrowers pay roughly 0.5% to 1.5% of the loan amount per year, though your exact rate depends on your lender and profile. Here is what that range costs monthly at common loan sizes:

Loan Amount	0.5% Rate	0.75% Rate	1.0% Rate	1.5% Rate
$200,000	$83	$125	$167	$250
$300,000	$125	$188	$250	$375
$400,000	$167	$250	$333	$500

These are illustrative figures, not quotes. If you don’t have a rate yet, 0.75% is a reasonable mid-range placeholder.

What Determines Your PMI Rate?

Credit score: The biggest factor. Stronger credit can mean a much lower rate, and the same loan can cost several times more in PMI at the low end of the credit range.
Loan-to-value ratio: The less you borrow relative to the home’s value, the lower the risk and usually the lower the rate.
Loan amount: PMI is a percentage, so bigger loans cost more in dollars.
Loan term: Shorter terms often carry lower rates.
Debt-to-income ratio: Higher DTI can mean higher pricing.
Occupancy: Primary homes typically get better pricing than second homes or investment properties.

How Your Down Payment Changes Your Loan

On a $400,000 home, the down payment changes both your loan size and your PMI. The rates below are hypothetical, to show the effect:

Down Payment	Loan Amount	LTV	Example PMI Rate	Monthly PMI
5% ($20,000)	$380,000	95%	1.00%	about $317
10% ($40,000)	$360,000	90%	0.75%	$225
15% ($60,000)	$340,000	85%	0.50%	about $142
20% ($80,000)	$320,000	80%	None	$0

A larger down payment reduces PMI twice: once through a lower rate, and again because the percentage applies to a smaller loan.

Example: When Can You Remove PMI?

Take the $360,000 loan on the $400,000 home, at 6.5% over 30 years. The monthly principal and interest payment is about $2,275.

80% of the original value: $320,000
78% of the original value: $312,000
With only scheduled payments, the balance reaches $320,000 in roughly 95 months, or about 8 years
At a flat $225 per month, that’s about $21,000 in PMI over that time

If your lender lowers the premium as your balance falls, or you make extra payments, your total will be lower. Use the calculator with your own numbers to see your timeline.

When Does PMI Go Away?

For most conventional loans, federal law (the Homeowners Protection Act) sets the main milestones:

Request cancellation at 80% LTV. You typically need a good payment history and no liens, and you contact your servicer.
Automatic termination at 78% LTV. If you’re current on payments, the lender must end PMI when the balance is scheduled to reach 78% of the original value.
Final termination at the loan’s midpoint. For covered loans, PMI also ends at the halfway point of the loan term if you’re current.

Rules can differ for certain loans and lender-paid structures, so confirm the details with your servicer.

How to Get Rid of PMI Faster

Make extra principal payments to reach 80% LTV sooner.
Order a new appraisal if your home’s value has risen. A higher value can put your LTV below 80% earlier than scheduled. Appraisals cost money, so compare that cost against the PMI you’d save.
Refinance once you have at least 20% equity, if the new rate and closing costs make sense.
Ask about any value-based removal policy your servicer offers, since requirements vary.

Types of PMI

Borrower-paid monthly PMI: The most common. It’s added to your mortgage payment and can be canceled as you build equity.
Lender-paid PMI: The lender pays the premium and you pay a higher interest rate. You can’t cancel it the same way, and refinancing is usually the way out.
Single-premium PMI: You pay the full premium at closing. It lowers your monthly payment but needs more cash upfront.
Split-premium PMI: A smaller upfront payment plus a lower monthly premium.

PMI vs. FHA Mortgage Insurance

PMI applies to conventional loans only. FHA loans use a mortgage insurance premium (MIP) instead, which includes an upfront fee and an annual premium. Depending on your down payment, FHA mortgage insurance can last 11 years or the life of the loan, and the rules are different from PMI. If you’re comparing loan types, look at total insurance cost over the time you expect to keep the loan.

Is It Worth Paying PMI?

Often, yes. Waiting years to save 20% can mean missing out on equity growth, or facing higher prices and rates. But PMI isn’t free. Compare your estimated monthly PMI against what waiting would cost you, and keep a plan to remove it as soon as you qualify.

How to Use the PMI Calculator (Step by Step)

Enter your home price and down payment.
Enter your estimated PMI rate, or use 0.75% if you don’t have a quote.
Enter your interest rate and choose your loan term.
Review your monthly PMI, LTV, and estimated months until removal.
Try different down payments and rates to see how much you could save.

Common PMI Mistakes to Avoid

Assuming PMI will drop off on its own the moment your home value rises. Rising value usually requires a request and sometimes an appraisal.
Forgetting PMI when budgeting your monthly housing payment
Comparing loans by interest rate alone, without counting PMI
Treating the estimate as a quote instead of confirming with lenders
Confusing PMI with homeowners insurance, which protects your property

FAQ: PMI Calculator

How do I calculate monthly PMI?
Multiply the loan amount by the annual PMI rate, then divide by 12.

How much is PMI on a $300,000 loan?
At rates of 0.5% to 1.5%, roughly $125 to $375 per month.

What is the average PMI rate?
Many borrowers fall between about 0.5% and 1.0% per year, with higher rates for lower credit scores and smaller down payments.

Is PMI based on loan amount or home value?
The premium is a percentage of your loan amount, but your rate depends partly on your loan-to-value ratio.

Does PMI protect me?
No. It protects the lender.

Is PMI tax deductible?
Tax treatment has changed several times and can depend on income and the tax year. Confirm the current rules with the IRS or a tax professional.

Does refinancing remove PMI?
It can, if your new loan has at least 20% equity. Otherwise a new loan may require PMI again.

Is the PMI calculator free?
Yes. The free PMI calculator needs no sign-up.

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Final Thoughts

PMI is a manageable cost when you plan for it. Know your estimated monthly payment, understand how down payment and credit change your rate, and track when you’ll reach 80% LTV so you can ask for removal. Start with the free PMI calculator, then confirm your real numbers with lenders before you commit.

PMI Calculator How to Estimate Your Monthly PMI Cost and When It Ends