Formula and method
This calculator uses the values you enter and applies the calculation immediately in your browser. The main output formulas are:
- Monthly payment (P&I):
(rate===0) ? (principal/(years*12)) : (principal*(rate/1200))/(1-Math.pow(1+(rate/1200),-(years*12))) - Total interest paid:
(((rate===0) ? (principal/(years*12)) : (principal*(rate/1200))/(1-Math.pow(1+(rate/1200),-(years*12)))) * years*12) - principal
Some formulas are undefined for certain input combinations, such as division by zero, equal x-values in a slope calculation, or logarithms of non-positive numbers. In those cases the live tool reports that the result is undefined instead of displaying Infinity or NaN.
Examples
- Example: with Loan amount = 350000, Annual interest rate = 6.5 %, Loan term = 30 years, this calculator returns Monthly payment (P&I) = 2212.24, Total interest paid = 446405.71.
- Share this page with a clean URL: https://specwhale.com/tools/mortgage-payment-calculator/
- Try related finance tools when your next step needs another conversion or calculation.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
Is Mortgage Payment Calculator free to use?
Yes. Mortgage Payment Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Mortgage Payment Calculator store or upload my data?
No. Mortgage Payment Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Mortgage Payment Calculator?
Mortgage Payment Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Mortgage Payment Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Mortgage Payment Calculator to your own blog post or page.
SEO and sharing notes
This page has a single clean canonical URL, descriptive metadata, breadcrumb structured data, and internal links to related tools. Supported calculators and converters can also copy a prefilled share link without changing the canonical index URL.