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:
(() => { const r=rate/1200; if (r===0) return principal/months; const pow=Math.pow(1+r, months); return !Number.isFinite(pow) ? principal*r : principal*r*pow/(pow-1); })() - Total paid:
(() => { const r=rate/1200; const p = r===0 ? principal/months : (() => { const pow=Math.pow(1+r, months); return !Number.isFinite(pow) ? principal*r : principal*r*pow/(pow-1); })(); return p*months; })()
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 = 25000 $, APR = 7.5 %, Term = 60 months, this calculator returns Monthly payment = 500.95 $, Total paid = 30056.92 $.
- Share this page with a clean URL: https://specwhale.com/tools/loan-payment-calculator/
- Try related finance tools when your next step needs another conversion or calculation.
Why the total interest number matters more than it looks
It's easy to focus only on the monthly payment and ignore total interest paid over the life of the loan -- but a lower monthly payment from a longer term almost always means paying significantly more interest overall, even at the same rate. Run the numbers at a couple of different terms to see the trade-off directly rather than optimizing for the smallest monthly number alone.
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 Loan Payment Calculator free to use?
Yes. Loan Payment Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Loan Payment Calculator store or upload my data?
No. Loan Payment Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Loan Payment Calculator?
Loan 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 Loan Payment Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Loan 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.