Mortgage Calculator — Free Online Tool
Calculate mortgage payments and total interest
How to use this tool
- [01]Enter the loan amount, interest rate, and loan term (typically 15 or 30 years).
- [02]Review the calculated monthly principal-and-interest payment and total interest over the life of the loan.
- [03]Open the full amortization schedule to see the principal/interest split for any specific month or year, or adjust the inputs to compare different scenarios.
About this Mortgage Calculator
The Mortgage Calculator computes your monthly principal-and-interest payment from loan amount, interest rate, and term using the standard amortization formula, then breaks the full loan down year by year (or month by month) so you can see exactly how much of each payment goes toward interest versus paying down the principal balance over time. Early in the loan, the split is weighted heavily toward interest; that ratio shifts toward principal as the balance shrinks, which is a normal feature of how amortized loans work rather than a sign of a bad rate.
The calculator handles principal and interest — the core of the amortization schedule — but a full monthly housing payment for most borrowers also includes property taxes, homeowners insurance, and sometimes PMI or HOA fees, which vary by location and lender and aren't part of a generic calculation. Treat the number here as the loan-payment component of your total housing cost, not the complete monthly outlay.
The full amortization table is useful beyond the headline monthly payment: it shows exactly how much total interest you'll pay over the life of the loan, and lets you compare scenarios — a 15-year versus 30-year term, or the effect of a slightly lower rate — side by side before committing to an actual loan application.
All calculation happens instantly in your browser from the numbers you enter; no financial details are transmitted or stored.
Our Mortgage Calculator is completely free to use with no signup required. For this tool, processing runs in your browser — your files and data stay on your device and are not uploaded to our servers.
Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.
Frequently asked questions
Is the Mortgage Calculator completely free?
Yes, the Mortgage Calculator is 100% free to use with no hidden charges, no subscription, and no signup required. Simply visit the page and start using it immediately.
Does this tool upload my files to a server?
No. Everything runs entirely in your browser using JavaScript. Your files, text, and data never leave your device and are never sent to our servers. This makes it completely private and secure.
Does the Mortgage Calculator work on mobile?
Yes, the Mortgage Calculator is fully responsive and works on all devices including smartphones, tablets, and desktop computers. It works on Chrome, Firefox, Safari, and Edge browsers.
How accurate is this tool?
Our Mortgage Calculator uses industry-standard algorithms to ensure accurate results every time. It has been tested extensively across different browsers and devices to ensure consistent and reliable output.
Does the monthly payment shown include taxes and insurance?
No — this calculates principal and interest only, the core loan payment. Property taxes, homeowners insurance, PMI, and HOA fees vary by location and lender and would need to be added on top for your actual total housing payment.
Why does most of my early payment go to interest instead of principal?
That’s how amortized loans work by design — interest is calculated on the remaining balance, which is highest at the start of the loan. As the principal shrinks, more of each subsequent payment goes toward principal instead of interest.
Related tools
Need a custom tool built for your business?
CodexStudio builds custom web applications, dashboards, and tools for businesses in Islamabad and worldwide. Get a free consultation today.