Mortgage Calculator
Enter your home price, down payment, interest rate and loan term to see your estimated monthly payment.
= $70,000 down
Options
$1,769.79
estimated monthly payment
- Principal & interest$1,769.79
- Loan amount$280,000
Processed on your device — nothing is sent anywhere.
How it works
- Enter the home price and your down payment, either as a dollar amount or a percentage.
- Set the annual interest rate and choose the loan term in years.
- Read your estimated monthly payment; open Options to add property tax, insurance and HOA fees to the breakdown.
Frequently asked questions
- How is the monthly mortgage payment calculated?
- The calculator uses the standard amortization formula: the loan amount multiplied by the monthly interest rate, divided by one minus the compounding factor over the full term. The loan amount is the home price minus your down payment. Taxes, insurance and HOA fees are added on top as simple monthly amounts.
- Does the estimate include property taxes and insurance?
- By default the result shows principal and interest only. Open the Options section to add annual property tax, annual homeowners insurance and a monthly HOA fee. These are then listed in the payment breakdown and included in the total monthly figure.
- How much down payment do I need to buy a house?
- A 20% down payment lets you avoid private mortgage insurance on most conventional loans, but many lenders accept far less — FHA loans start around 3.5% and some conventional programs at 3%. A smaller down payment means a larger loan and a higher monthly payment. Use the percentage toggle here to compare scenarios side by side.
- Should I choose a 15-year or a 30-year mortgage?
- A 30-year term gives you a lower monthly payment, while a 15-year term costs more per month but far less in total interest because the balance shrinks faster. Change the term field and compare the two payments — if the 15-year figure fits your budget comfortably, it usually saves a substantial amount over the life of the loan.
- Is my financial information sent to a server?
- No. Every calculation runs locally in your browser using JavaScript, and nothing you type is transmitted or stored anywhere. You can even use the calculator offline once the page has loaded.
About this tool
This mortgage calculator estimates the monthly cost of a home loan from four inputs: the home price, your down payment, the annual interest rate and the loan term. The core result is the principal-and-interest payment, and you can optionally layer in annual property tax, homeowners insurance and a monthly HOA fee to see a figure much closer to what you would actually pay each month.
Everything runs client-side. The page applies the standard amortization formula in JavaScript the moment you change a field, so results update instantly and none of your financial details ever leave your device. There is no account, no server round trip and nothing stored — which also means the calculator keeps working offline once it has loaded.
The most common uses are early-stage budgeting and offer comparison. Before house hunting, plug in prices from listings you like and see whether the payment fits your monthly budget. When comparing lenders, keep the price and term fixed and vary only the rate — even a quarter-point difference is easy to see in the payment. The same setup works for a quick refinance check: enter your remaining balance as the price with a zero down payment and your new rate and term.
A few practical tips: always add taxes and insurance before judging affordability, because in many areas they add hundreds of dollars to the real monthly cost. Test the payment at a rate half a point above your quote so a lock-in delay does not break your budget. And compare a 15-year term against a 30-year one — the shorter term’s higher payment often buys a surprisingly large saving in total interest.