Plan your home purchase with Confidence. Go deeper with the US mortgage analysis. Model extra payments, compare refinancing options and view your full amortization schedule - built for American homebuyers who want the full picture.
The Advanced Mortgage Calculator goes well beyond a basic payment estimate. It is designed specifically for US mortgages using monthly compounding — giving you accurate results that reflect how American lenders calculate interest on conventional, FHA and other loan types.
In addition to your standard monthly payment and amortization breakdown, this calculator lets you model extra payments, explore refinancing scenarios and view a complete payment-by-payment amortization schedule. Whether you are planning your first home purchase, considering paying down your mortgage faster or thinking about refinancing, this tool gives you the full picture in one place — completely free.
Start by entering your mortgage details in the input panel. Here is what each field means:
Results update automatically as you change any field. Click Calculate to refresh or Reset to return to the default values.
One of the most powerful features of this calculator is the ability to model extra payments on top of your regular mortgage payments. Even small additional amounts applied directly to your principal can save thousands of dollars in interest and shorten your loan term significantly.
You can enter extra payments in two ways:
Once you enter extra payments the calculator will show you the interest saved compared to making only regular payments, and the time saved — how many months or years earlier your mortgage will be paid off. This side-by-side comparison makes it easy to see the real financial impact of paying a little extra each month.
Refinancing means replacing your current mortgage with a new one — usually to secure a lower interest rate, reduce your monthly payment, shorten your loan term or access home equity through a cash-out refinance. While refinancing can save significant money over time, it comes with upfront costs such as closing costs, origination fees and appraisal fees that need to be weighed against the long-term savings.
The refinancing section of this calculator helps you model exactly that:
The calculator then shows your monthly savings with the new rate and — most importantly — your breakeven point. The breakeven point is the number of months it takes for your accumulated monthly savings to cover the upfront cost of refinancing. If you plan to stay in the home longer than the breakeven period refinancing generally makes financial sense. If you expect to move before then it may not be worth the cost.
Here is a plain-language explanation of every result the calculator provides:
This is your core principal and interest payment due each month. It does not change over the life of a fixed-rate mortgage. The total monthly housing cost shown includes this payment plus property tax, home insurance, PMI and HOA fees if entered.
Each monthly payment is split between principal — the portion reducing your outstanding loan balance — and interest — the cost of borrowing. In the early years of a 30-year mortgage the majority of each payment goes toward interest. This ratio gradually shifts in favor of principal as the balance decreases over time.
If your down payment is less than 20% of the home price most US lenders require PMI. It protects the lender — not you — in the event of default. PMI is typically added to your monthly payment and can generally be removed once your loan-to-value ratio reaches 80%. The calculator includes your PMI amount in the total monthly housing cost.
Total Interest is the full amount of interest you will pay over the entire loan term. Total Cost is your original loan amount plus all interest paid — the true cost of the home over the life of the mortgage. These figures clearly illustrate how your interest rate and loan term dramatically affect what you ultimately pay.
The LTV is your loan amount expressed as a percentage of the home's purchase price. A lower LTV means more equity in the home and generally results in better loan terms. An LTV above 80% typically triggers PMI. As you make payments and your balance decreases your LTV improves.
Most US lenders require an escrow account to collect and hold funds for property taxes and homeowners insurance. A portion of each monthly payment goes into escrow and the lender pays these bills on your behalf when they come due. The calculator estimates your monthly escrow contribution based on the tax and insurance amounts you enter.
The full amortization schedule shows every payment over the life of the loan. Each row displays the payment number, date, payment amount, principal portion, interest portion, cumulative interest paid to date and the remaining balance. You can view it annually or monthly and export it as a CSV file for your own records or to share with a mortgage professional or financial advisor.
When extra payments are entered these two figures show the direct benefit. Interest Saved is the total reduction in interest costs compared to making only regular payments. Time Saved shows how many months earlier your mortgage will be fully paid off. Together they make a compelling case for — or against — making additional payments based on your financial goals.