Mortgage Calculator
Calculate monthly principal and interest payments, down payment impact, and yearly amortization schedules for your home loan. Free in your browser.
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How to use Mortgage Calculator
- 1
Enter target home value and down payment details.
- 2
Specify the annual interest rate and term years.
- 3
Click calculate to compute monthly costs and amortization schedules.
Capabilities
- Computes exact monthly principal and interest payouts
- Generates full yearly amortization schedule data
- Dynamic mortgage summaries calculating total loan costs
- Clear tabular view of remaining debt over time
How Monthly Mortgage Payments Are Calculated
Purchasing real estate is often the largest financial commitment of a lifetime. Calculating your mortgage enables you to determine how much home you can comfortably afford, how down payment amounts affect financing, and how principal equity builds over a 15-year or 30-year schedule.
This calculator computes Principal and Interest (P&I). Complete real-world housing costs typically also include property taxes, hazard insurance, HOA dues, and private mortgage insurance (PMI).
Subtracts your initial cash down payment from the home purchase value to calculate net borrowed principal, directly reducing financing charges.
Displays yearly principal paid, interest paid, and remaining debt balance to track equity accumulation over 10, 15, 20, or 30-year terms.
Worked Mortgage Calculation Example
Suppose you buy a $400,000 home with a $80,000 down payment (20%), financing $320,000 at 6.5% interest for 30 years:
Monthly P&I Payment: $2,022.62
Total Interest Paid (30 Years): $408,143.20 (exceeds original borrowed principal!)
Total Loan Repayment: $728,143.20
Financing the same amount over 15 years at 6.0% raises the payment to $2,700.28 but saves $242,093 in total interest.
To compare two different interest rates or loan terms simultaneously, use Loan Calculator.
This tool operates in a sandbox directly inside your web browser. All parsing, processing, and downloads are rendered locally. Your file size, metadata, and contents never cross the network. It works completely offline.
Frequently Asked Questions
What does this mortgage calculator include?
This calculator determines the monthly Principal & Interest (P&I) payment, total interest payable over the term, and full yearly amortization balances based on home purchase price, down payment, interest rate, and loan term.
Does this calculator include property taxes, insurance, or HOA fees?
No. This tool calculates pure principal and interest financing costs. It does not include property taxes, homeowner's insurance (HOI), Private Mortgage Insurance (PMI), or HOA dues, which can add 20% to 35% to total monthly housing expenses.
How does down payment size impact my mortgage?
A larger down payment reduces the borrowed principal, lowering both your monthly payment and total lifetime interest charges. In many markets, putting down 20% or more also eliminates private mortgage insurance (PMI) requirements.
Should I choose a 15-year or 30-year mortgage term?
A 30-year mortgage offers lower monthly payments, providing budget flexibility. A 15-year mortgage requires higher monthly payments but dramatically cuts total interest paid and builds home equity much faster.
Are my entered home purchase numbers kept private?
Yes. All mortgage calculations run locally in your browser memory; your home values and financial details are not sent to WebTorq for processing.