Mortgage Calculator

Estimate your home loan payment

This calculator uses the standard amortization formula to estimate your monthly principal and interest based on the financed amount (home price minus down payment), the interest rate and the loan term. It also totals the interest you will pay over the life of the loan.

Figures cover principal and interest only and exclude property taxes, homeowners insurance and HOA fees, which vary by location.

Inputs and outputs

• Inputs: home price, down payment, interest rate, term
• Monthly principal-and-interest payment
• Loan amount, total interest and total cost

Key features at a glance

• Estimates the monthly principal-and-interest payment
• Inputs: home price, down payment, interest rate, and term
• Shows the loan amount, total interest, and total cost
• Uses the standard amortization formula
• Covers principal and interest only (excludes taxes and insurance)
• Runs entirely in your browser, even offline

How a mortgage payment is calculated

A mortgage payment is computed with the amortization formula, the same one behind any installment loan. It takes the financed amount — the home price minus your down payment — together with the monthly interest rate and the total number of monthly payments, and produces a single fixed payment that repays the loan exactly by the end of the term. Each month, part of that payment covers interest on the outstanding balance and the rest reduces the principal.

Early in the loan, the balance is large, so most of each payment goes to interest and little to principal. As the balance falls, the interest portion shrinks and more of each payment chips away at the principal — a process called amortization. This is why the total interest over a 30-year mortgage can rival or exceed the amount borrowed, and why the calculator highlights total interest alongside the monthly figure.

How down payment and term change the cost

Two levers dramatically affect what a mortgage costs. A larger down payment reduces the amount you finance, which lowers both the monthly payment and the total interest, and may also help you avoid mortgage insurance and secure a better rate. Even a few extra percentage points down can save a meaningful sum over the life of the loan.

The term — typically 15 or 30 years — trades monthly affordability against total cost. A 30-year term spreads payments thin, making the monthly figure low but piling up far more interest. A 15-year term raises the monthly payment but slashes total interest because the balance is repaid in half the time at often-lower rates. Comparing terms in the calculator makes this trade-off concrete.

What the estimate leaves out

This calculator covers principal and interest, the part of your payment that repays the loan. Real monthly housing costs usually include more: property taxes, homeowners insurance, and, where applicable, mortgage insurance and homeowners association (HOA) fees. Lenders often bundle taxes and insurance into the monthly payment through an escrow account, so your actual bill can be noticeably higher than the principal-and-interest figure.

Because these extras vary so much by location and property, they are best estimated separately and added on top. Treating the calculator's output as the loan-repayment core of your housing budget, then layering in taxes, insurance, and fees, gives a realistic picture of affordability rather than an understated one.

Tips for using the mortgage calculator

• Compare 15-year and 30-year terms to weigh monthly cost against total interest
• Test how a larger down payment lowers both the payment and total interest
• Add estimates for property tax, insurance, and HOA fees to the result
• Remember a lower rate can save tens of thousands over the term
• Use the total-cost figure, not just the monthly payment, to judge affordability

Why choose our mortgage calculator?

Our calculator is completely free with no signup, no limits, and no subscription. It runs entirely in your browser, so estimates are instant, it works offline, and your financial details are never sent to a server.

It is one of more than 200 free tools on ToopTools, and you can pin it to your My Workspace, a personalized workspace where you keep the tools you use most in a single dashboard. Beside the EMI, compound interest, and other finance tools, it helps you plan a home purchase with confidence.

Common use cases

Prospective home buyers use the mortgage calculator to estimate their monthly payment before house-hunting, to see how much home they can afford, and to compare scenarios with different down payments, rates, and terms. It turns a daunting decision into a set of clear, comparable numbers.

Homeowners considering refinancing use it to compare a new rate or term against their current loan, and anyone budgeting for a purchase uses the total-cost figure to understand the long-term commitment. Because it shows total interest, it reveals the true price of borrowing, not just the monthly outlay.

Is the mortgage calculator free?

Yes. It is completely free with no account, no sign-up, and no usage limits. Run as many estimates as you like at no cost.

Does the estimate include taxes and insurance?

No. It calculates principal and interest only. Property taxes, homeowners insurance, mortgage insurance, and HOA fees vary by location and should be estimated separately and added to the monthly figure.

How does the down payment affect my payment?

A larger down payment reduces the financed amount, which lowers both your monthly payment and the total interest you pay. It can also help you avoid mortgage insurance and may qualify you for a better rate.

Should I choose a 15-year or 30-year term?

A 30-year term has lower monthly payments but much higher total interest. A 15-year term costs more each month but repays faster with far less total interest. The right choice depends on your budget and goals.

Why is so much of my early payment interest?

Interest is charged on the outstanding balance, which is largest at the start. So early payments are mostly interest, and as the balance falls, more of each payment goes toward principal — the amortization process.

Are my financial details kept private?

Yes. Everything is computed in your browser and nothing is uploaded, so your home price, down payment, and other figures stay private and the tool works without an internet connection.

How do I calculate my monthly mortgage payment?

Enter the home price, down payment, interest rate, and loan term, and the calculator instantly shows your monthly principal-and-interest payment, the total interest, and the total cost over the life of the loan.

Does the mortgage calculator work offline?

Yes. The calculation runs entirely in your browser, so once the page has loaded the tool works without an internet connection, and your financial details are never uploaded — they stay private on your own device.