Free Mortgage Calculator
Updated September 2026
Calculate your monthly mortgage payment and total interest paid — enter your loan amount, interest rate, term, and down payment for instant results in over 40 world currencies.
Verified Capabilities
Instantly computes monthly payment, total payment, and total interest for any loan amount, rate, and term, updating live as you type.
Switch the displayed currency symbol across 40+ world currencies from the dropdown.
Download the calculated result as a CSV or plain text file.
Only principal and interest are calculated — property tax, homeowners insurance, and PMI are not included, so your real monthly payment will typically be higher.
Whether you're planning finances, comparing options, or verifying numbers, having an accurate calculator ready saves time and prevents costly mistakes.
Calculate your monthly mortgage payment and total interest paid — enter your loan amount, interest rate, term, and down payment for instant results in over 40 world currencies. Results are immediate — no waiting, no loading screens, no account required.
Who uses the Mortgage Calculator?
- First-time home buyers comparing 15-year vs 30-year mortgage options before meeting a lender
- Homeowners exploring refinancing by entering their remaining balance and a new rate
- Real estate investors stress-testing cash flow by adjusting rates and terms on investment properties
Common uses and search terms
The Mortgage Calculator is frequently used for: mortgage, home loan, monthly payment, amortization, house payment calculator, mortgage payment calculator, home loan calculator, 30 year mortgage, 15 year mortgage, mortgage interest calculator, monthly mortgage payment, principal and interest, mortgage amortization schedule, refinance calculator, how much house can i afford. Whether you need a quick result or are working through a longer project, the tool handles all common variations without any configuration.
Accuracy and formula transparency
The Mortgage Calculator uses a validated formula consistent with published standards from recognised financial and mathematical authorities. All arithmetic is performed with 64-bit IEEE 754 floating-point precision — the same standard used by Microsoft Excel, Google Sheets, and professional financial software. Rounding, if applied, follows standard half-up convention unless stated otherwise. Inputs and results are processed entirely in your browser; no data is transmitted to any server. For consequential financial or legal decisions, always verify results with a qualified professional.
Why use Allio Tools's Mortgage Calculator?
Everything runs locally in your browser. No data is sent to a server, logged, or stored anywhere. The tool is completely free with no usage limits, no premium tiers, and no account required. Available in 11 languages and optimised for all screen sizes, the Mortgage Calculator works on desktop, tablet, and mobile with no app download needed.
See also:Currency Converter · Loan Calculator · Unit Converter
How the Mortgage Calculator works
Enter the home price in the Loan Amount field (default: $300,000).
Set your Annual Interest Rate — check your lender's pre-approval letter or current rate estimates.
Choose your Loan Term in years (30 and 15 years are most common).
Enter your Down Payment amount to calculate the financed principal.
Click Calculate to see your monthly payment, total payment, and total interest. Download the result as CSV or Text.
Tips & tricks
- The calculator supports over 40 world currencies via the dropdown — the math itself doesn't change, only the currency symbol shown, so make sure you select the right one before comparing results to a lender quote in a different currency.
- Only principal and interest are calculated here — your actual monthly mortgage payment will typically be higher once property tax, homeowners insurance, and (if your down payment is under 20%) PMI are added by your lender.
- For refinancing, enter your current loan's remaining balance as the Loan Amount, not the original purchase price — using the original amount will overstate your real payment.
- Results update live as you type (with a short debounce), so you can drag the interest rate or term up and down to see how sensitive your payment is to each variable.
Frequently Asked Questions
What is included in my monthly mortgage payment?
This calculator shows principal and interest only. Your actual payment will also include property taxes and homeowners insurance (often called PITI — Principal, Interest, Taxes, Insurance), and private mortgage insurance (PMI) if your down payment is under 20%.
How much house can I afford with a $2,000 monthly payment?
At a 6.5% interest rate on a 30-year loan with a 20% down payment, a $2,000/month payment corresponds to roughly a $315,000 home price. Use the calculator to reverse-engineer your target by adjusting the loan amount until the monthly figure matches your budget.
What is an amortization schedule, and does this calculator show one?
An amortization schedule is a table showing how each monthly payment splits between principal and interest over the life of a loan — early payments are mostly interest, later payments are mostly principal. This calculator computes your monthly payment, total payment, and total interest instantly, but does not display a month-by-month amortization table.
How does the down payment affect my monthly payment?
A larger down payment reduces the financed amount, which lowers both your monthly payment and the total interest paid over the loan term. A 20% down payment also eliminates the need for private mortgage insurance (PMI), saving you further.
Is this calculator accurate for refinancing?
Yes. Enter the remaining balance of your current mortgage as the Loan Amount, input the new interest rate you've been quoted, and set the remaining or new term. The result shows what your refinanced monthly payment would be.
Is my data safe when using the Mortgage Calculator?
Completely safe. The Mortgage Calculator processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
How accurate are the Mortgage Calculator results?
The Mortgage Calculator uses standard, well-established mathematical formulas used by professionals worldwide — the same ones used by banks, financial advisors, and accounting software. Results are as accurate as the inputs you provide. See our <a href="/methodology/">Methodology page</a> for formula sources and references. For financial decisions, always verify with a qualified professional.
Can I share the Mortgage Calculator results with someone?
Yes. Copy the result number or screenshot the page to share via message, email, or social media. You can also bookmark and share the tool URL directly — the Mortgage Calculator opens instantly for anyone with a modern browser, no account needed.
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