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Mortgage Details
$400,000
$
%
30 Years
6.5%
Payment Breakdown
Estimated Monthly Payment
$0.00
Principal Paid
$0
Interest Paid
$0
Total Loan Cost
$0
Principal (100.0%)
Interest (0.0%)
What is the Mortgage Calculator?
The Mortgage Calculator is an essential homebuying tool that instantly processes complex amortization math. It allows future homeowners to estimate their exact monthly financial commitment before speaking to a lender.
What does it do?
- • Estimates your monthly Principal & Interest payment.
- • Calculates the total interest paid over the life of the loan.
- • Syncs Down Payment percentages and dollar amounts automatically.
- • Provides an instant visual breakdown of your loan costs.
Who is it for?
- • First-time homebuyers estimating affordability.
- • Real estate investors analyzing property cash flow.
- • Homeowners considering refinancing options.
- • Financial advisors assisting clients with real estate planning.
How to calculate your mortgage
How it Works
- 1
Set Home Price & Down Payment
Enter the total price of the home and your expected down payment. You can input the down payment as either a fixed dollar amount or a percentage. - 2
Adjust Loan Terms
Select your expected loan term (typically 15 or 30 years) and your estimated annual interest rate using the sliders. - 3
Review Your Payment
The calculator instantly reveals your estimated monthly payment, along with a visual breakdown showing the ratio of principal to interest.
Mortgage Calculation Explained
Standard Amortization Formula:
M = P [ r(1 + r)ⁿ ] / [ (1 + r)ⁿ - 1 ]
| Variable | Definition |
|---|---|
| M | Monthly Payment: The estimated principal and interest due each month. |
| P | Principal: The base amount borrowed (Home Price minus Down Payment). |
| r | Monthly Interest Rate: Your annual interest rate divided by 12 (and converted to a decimal). |
| n | Number of Payments: The total months of the loan (e.g., 360 for a 30-year term). |
Frequently Asked Questions
Frequently Asked Questions
Yes, our Mortgage Calculator is completely free with no usage limits. You do not need to provide an email address or create an account.
This calculator computes the Principal and Interest (P&I) portions of your mortgage. It does not currently include property taxes, homeowner's insurance, or PMI (Private Mortgage Insurance), which will increase your actual monthly housing cost.
Mortgages use compound amortization over long periods. While a 30-year term gives you a lower monthly payment than a 15-year term, you pay interest on the outstanding balance for twice as long, resulting in significantly higher total interest paid.
Even a 1% increase in your mortgage rate can add tens of thousands of dollars in interest over a 30-year loan and noticeably increase your monthly payment. Use the slider to see exactly how different rates impact your specific scenario.