How is the monthly mortgage payment calculated?

We use the standard amortization formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ], where P is principal, i is monthly interest rate, and n is number of payments. Taxes and insurance are added on top.

What is PMI and when can I remove it?

Private Mortgage Insurance (PMI) is typically required if your down payment is less than 20%. You can usually request cancellation once you reach 20% equity, or it terminates automatically at 22% equity based on the original amortization schedule.

What would the payment be on a $300,000 loan at 6.5% interest?

For a $300,000 loan at 6.5% over 30 years, the principal and interest payment is approximately $1,896. Adding estimated taxes ($300/mo), insurance ($100/mo), and PMI ($150/mo) brings the total to roughly $2,446 per month.

Does the calculator include property taxes and homeowners insurance?

Yes. You can enter annual property tax and insurance amounts, and the tool divides them by 12 to add to your monthly payment (PITI). You can also add monthly HOA dues and PMI costs.

What is an amortization schedule?

An amortization schedule is a table detailing each periodic payment on a loan. It shows how much of each payment goes toward interest versus principal and displays the remaining balance after every payment until the loan is paid off.

How much faster do I pay off my mortgage if I pay an extra $100 a month?

On a $300,000 loan at 6.5% for 30 years, paying an extra $100 monthly reduces the term by approximately 4 years and saves over $45,000 in total interest. Use the amortization chart to see the exact impact for your specific numbers.

Is my financial data saved or shared when I use this tool?

Absolutely not. This calculator runs entirely in your browser using JavaScript. No loan amounts, rates, or personal information are transmitted to our servers or stored in databases. It is 100% private.

Can I use this calculator for refinancing scenarios?

Yes. Simply enter your current remaining balance as the 'Loan Amount' (or Home Price minus equity), the new interest rate, and the new term. It will show your new payment and total interest savings compared to your current loan.

What credit score is needed for the best mortgage rates?

Generally, a credit score of 740 or higher qualifies for the best conventional rates. Scores between 700-739 get good rates, while 620-699 may see higher rates or require FHA loans. This calculator lets you test any rate scenario.

Home CalculatorsMortgage Calculator - Monthly Payment Free

100% Client-Side Privacy Auditing

Calculate Your Home Budget with Mortgage Auditing

Estimate your monthly payments and analyze your amortization schedule. Include property taxes, home insurance, and Private Mortgage Insurance (PMI) estimates. View total interest costs over the life of your home loan.

How the Mortgage Calculator Works

Model your monthly expenses, down payments, and interest allocations in three simple steps.

Enter Purchase Parameters

Input the target home price and your down payment in dollars or percentage. Define the principal balance of the loan.

Set Rate & Term Length

Choose your amortization term length (e.g. 15-year or 30-year fixed) and input the expected annual interest rate.

Inspect Amortization Schedule

Audit the breakdown of principal vs. interest over time. Factor in taxes, insurance, and PMI, then download the ledger.

Why use our Mortgage Simulator?

Buying a home is one of the largest financial decisions you will make. Our calculator helps you model every expense with absolute privacy.

Complete Cost Breakdown

View a detailed breakdown of your monthly payment, including principal, interest, local property taxes, homeowners insurance, and Private Mortgage Insurance (PMI).

Interactive Amortization schedule

Track how each payment reduces your principal balance over the life of the loan. Identify exactly when your PMI will be removed (once equity reaches 20%).

Zero Data Leakage

Your income, home value, and financial assets are processed strictly client-side in your local browser sandbox memory. No numbers are ever uploaded or shared.

Monthly P&I:$1,895.00

PMI & Taxes:$450.00

Frequently Asked Questions

Answers to popular questions about home loans, principal, and amortization.

Q.
What is included in a monthly mortgage payment?

A complete monthly payment typically includes Principal (repaying the borrowed amount), Interest (the cost of borrowing), Property Taxes (assessed by your local government), Homeowners Insurance (protecting your asset), and Private Mortgage Insurance (PMI) if your down payment is below 20%.

Q.
What is Private Mortgage Insurance (PMI) and how do I avoid it?

PMI is an extra insurance fee required by lenders to protect their investment if you put down less than 20% of the home's purchase price. You can avoid PMI by making a down payment of 20% or more, or cancel it once your unpaid loan principal falls to 80% of the home's original value.

Q.
How does the loan term affect my total interest cost?

Shorter loan terms (such as a 15-year fixed mortgage) have higher monthly payments because you repay the principal faster, but they offer significantly lower interest rates and save you tens of thousands of dollars in total interest costs compared to a 30-year term.

Q.
Are these interest and amortization calculations private?

Yes, 100% private. All amortization and tax calculations occur strictly inside your local browser sandbox memory using client-side JavaScript. None of your private financial data is ever transmitted to external servers.