🏠Mortgage Calculator
Estimate your monthly mortgage payment — including taxes, insurance, and PMI — with a full amortization schedule and total-cost breakdown. Free, instant, no sign-up required.
Principal vs Interest Per Payment
Amortization Schedule
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Free Mortgage Calculator Online
Buying a home? Our free Mortgage Calculator shows your real monthly cost the moment you enter your numbers. As a fast and reliable mortgage calculator, it takes your home price, down payment, interest rate, and loan term and instantly works out your monthly payment, total interest, and the total cost of the loan over its lifetime—so there are no surprises before you commit.
But it does more than principal and interest. Add property tax, home insurance, PMI, and HOA fees to see your full monthly payment, then explore a complete amortization schedule showing how each payment splits between principal and interest as your balance falls. A clear chart maps principal against interest across the term, and you can switch between international and Indian number formats with every figure shown in words as you type. Whether you're comparing homes, rates, or down payments, adjust any figure and instantly see the impact.
Simply enter your mortgage details to see the results instantly. No sign-up, no downloads, no limits—just clear numbers whenever you need them.
About the Mortgage Calculator
What it does
The Computezy Mortgage Calculator estimates your monthly mortgage payment and the total cost of a home loan. Enter a home price, down payment, annual interest rate, and loan term, and the tool instantly applies the standard mortgage amortization formula to return your monthly principal and interest (P&I) payment, total interest paid, and total loan cost. Results update live as you type — no button required.
Monthly payment with taxes, insurance & PMI
The optional section lets you add annual property tax, annual home insurance, monthly PMI (Private Mortgage Insurance), and monthly HOA fees. When any of these are entered, the tool shows a full monthly PITI-style payment — Principal, Interest, Taxes, and Insurance — alongside a breakdown of each component. The amortization schedule and chart always reflect the pure P&I calculation, since taxes and insurance don't affect how your loan balance amortizes.
PMI (Private Mortgage Insurance)
PMI is typically required by lenders when the down payment is less than 20% of the home price (loan-to-value ratio above 80%). It protects the lender rather than the borrower and is usually a monthly cost added to the mortgage payment. Enter your estimated monthly PMI to include it in your full monthly payment total.
Amortization schedule
The tool generates a full payment-by-payment amortization table showing the interest portion, principal portion, and remaining balance for every month of the loan. Each row's interest and principal always sum to the fixed monthly payment. The balance decreases to approximately zero in the final period.
The interest portion of each payment is calculated on the outstanding balance: interest = balance × monthly rate. The principal portion is the payment minus interest. Because the balance is highest at the start, early payments are interest-heavy. As the balance falls, more of each payment goes to principal — this shift is visible in the amortization chart.
Principal vs interest chart
The SVG chart plots principal and interest per payment across the full loan term. The interest area (orange) starts high and falls, while the principal area (green) starts low and rises. The point where they cross is roughly the midpoint where the loan balance has fallen enough that more each payment goes to principal than interest.
International and Indian number formatting
The number system toggle switches all figures between international grouping (e.g. $1,000,000 — millions) and Indian grouping (e.g. ₹10,00,000 — lakhs and crores). Currency symbols switch between $ and ₹ accordingly. Every significant input and output also shows the amount in words beneath the number (e.g. "Four Hundred Thousand" or "Forty Lakhs") as a quick visual check against misplaced zeros.
The maths
Monthly P&I is calculated using the standard fixed-rate mortgage formula:
P = L × r(1 + r)^n / ((1 + r)^n − 1)
Where L is the loan amount (home price minus down payment), r is the monthly interest rate (annual rate ÷ 12 ÷ 100), and n is the total number of monthly payments (years × 12). If the rate is 0%, the payment is simply the loan divided by the number of periods.
Disclaimer
This tool provides general estimates for planning and comparison purposes only. It is not financial advice. Actual mortgage payments, interest rates, fees, property taxes, and insurance premiums vary by lender, loan product, location, and borrower profile. Always confirm all figures with your lender and a qualified financial adviser before making any home purchase or financing decision.
Frequently Asked Questions
How does the mortgage calculator work?
Enter your home price, down payment, annual interest rate, and loan term. The tool instantly calculates your monthly principal and interest payment, total interest paid, and the total cost of the loan. It also shows a full amortization schedule and a principal-vs-interest chart. Optionally expand the taxes and fees section to add property tax, home insurance, PMI, and HOA fees — the tool then shows your complete monthly payment including all those costs.
Is the mortgage calculator free to use?
Yes, completely free with no sign-up, no downloads, and no limits. You can run as many scenarios as you like — change the home price, down payment, rate, or term and the results update instantly.
Does it include taxes and insurance?
Yes, optionally. Click the "Optional: taxes, insurance & fees" section to expand it and enter annual property tax, annual home insurance, a monthly PMI amount, and monthly HOA fees. The tool adds all these to your monthly principal and interest to show your full PITI-style monthly payment alongside a breakdown of each component.
What is PMI?
PMI stands for Private Mortgage Insurance. Most lenders require it when your down payment is less than 20% of the home price (i.e. the loan-to-value ratio exceeds 80%). It protects the lender if you default on the loan and is typically paid as a monthly premium. Once you've built enough equity — usually when the loan balance falls below 80% of the home's value — you may be able to cancel PMI. You can enter your estimated monthly PMI amount in the optional section of the calculator.
What is an amortization schedule?
An amortization schedule is a month-by-month table showing how each mortgage payment is divided between the interest portion and the principal portion, along with the remaining loan balance after each payment. It lets you see exactly how your loan balance decreases over time and how much of the total interest you'll pay by any given point in the loan's life.
Why is so much of the early payment interest?
With a standard amortizing mortgage, interest is charged on the outstanding loan balance each month. At the start of the loan the balance is highest, so interest takes the largest share of each payment. As you pay down the balance over time, the interest portion shrinks and the principal portion grows. By the final payments, nearly the entire payment goes to principal. This is why extra early payments can significantly reduce total interest paid.
How does the down payment affect my monthly payment?
A larger down payment reduces the loan amount, which directly lowers your monthly principal and interest payment and the total interest you'll pay over the life of the loan. It can also eliminate or reduce PMI if it brings the loan-to-value ratio below 80%. You can experiment with different down payment amounts in the calculator to see the impact instantly.
Can I switch between international and Indian number formats?
Yes. Use the number system toggle at the top to switch between international formatting (e.g. 1,000,000) and Indian formatting (e.g. 10,00,000 — lakhs and crores). Every figure on the page updates immediately, including inputs, summary cards, the monthly breakdown, and the amortization table. Numbers are also shown in words beneath significant inputs and results as a visual sanity check — useful for catching misplaced zeros on large amounts.
Is my data stored anywhere?
No. All calculations run entirely in your browser. Your numbers are never stored, shared, or sent to any server. Close the tab and the data is gone — there's nothing to delete or worry about.
Can I rely on this for a financial decision?
The calculator gives useful estimates for planning and comparing mortgage scenarios, but it is a general-purpose tool — not financial advice. Actual mortgage rates, fees, property taxes, and insurance costs vary by lender, location, and borrower profile. Always verify exact figures with your lender and financial adviser before committing to a home purchase or mortgage.