Plain-language documentation
How this private loan calculator works
See how your monthly payment is divided between interest and principal without creating an account.
Enter your current loan balance, annual interest rate, and required monthly payment. You can also test an extra principal payment.
The calculator runs a Rust calculation engine inside your browser. Your loan numbers are not sent to our server.
The result shows your first payment breakdown, estimated payoff date, remaining interest, and the effect of paying extra.