Mortgage Calculator
Estimate your monthly mortgage payment, total interest, and total cost from home price, down payment, rate, and term. Free, no signup. Fast and privacy-conscious. Data handling depends on the tool and is documented on each page.
Principal and interest only. Add property tax, insurance, and HOA for full housing cost.
Tool not working or missing something?
This tool is open-source and community-driven. If you find a bug, have a feature request, or want to contribute a new tool, please create a PR on GitHub or contact us.
Instant Browser Processing
Results appear the moment you act — no server queues, no loading spinners. All processing runs locally for zero-latency professional output.
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Mortgage Calculator — Your True Monthly Payment
Before committing to a home, you need a clear picture of the monthly payment and the total interest over the life of the loan. This calculator takes the home price, down payment, interest rate, and term, and returns your principal-and-interest payment plus the total cost.
How It Is Calculated
The loan amount is the home price minus your down payment. The monthly payment uses the standard amortization formula M = P · r · (1+r)^n / ((1+r)^n − 1), where r is the monthly rate and n is the number of monthly payments. Early payments are mostly interest; later ones are mostly principal.
What the Estimate Excludes
This is principal and interest only. Your real monthly housing cost also includes property tax, homeowners insurance, and possibly PMI or HOA dues — add those separately for a full budget.
Key Features & Benefits
Every feature is designed to deliver professional results with maximum speed and minimum friction. No compromises on quality, privacy, or accessibility.
How to Use Mortgage Calculator — Step by Step
Follow these simple steps to get your result in under 30 seconds. No signup, no install, no learning curve — just paste, process, and download.
Enter Your Values
Type your numbers into the labelled fields in Mortgage Calculator. Each input is clearly described so you know exactly what to enter.
Adjust the Options
Pick the relevant settings — such as units, rates, or rounding — to match your specific situation.
Read Your Result
Mortgage Calculator updates the result automatically as you change inputs, so you can compare scenarios in seconds.
Copy or Share
Copy the result or share the page link. Nothing is stored, so your numbers stay private.
Mortgage Calculator — Frequently Asked Questions
Got questions about Mortgage Calculator? Here are clear, honest answers to the most common questions about pricing, privacy, compatibility, and features.
What does this mortgage calculator include?
It calculates principal and interest based on your loan amount, rate, and term. Property tax, insurance, PMI, and HOA fees are not included and should be added separately.
How does the down payment affect my payment?
A larger down payment reduces the loan amount, which lowers both the monthly payment and the total interest paid, and may help you avoid PMI.
Why is so much early payment interest?
With amortization, interest is charged on the remaining balance, which is highest at the start. As the balance falls, more of each payment goes to principal.
How much total interest will I pay?
The calculator shows total interest over the full term. A shorter term or lower rate reduces it substantially, even if the monthly payment is higher.
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