Calculate exact monthly car payments with taxes, trade-in value, and total loan interest.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Input the vehicle's sticker price, your cash down payment, and any trade-in allowance.
Select your financing APR % and loan duration (e.g. 36, 48, 60, or 72 months).
View the exact monthly installment, sales tax amount, and total interest paid.
Longer loan terms (e.g. 72 or 84 months) reduce your monthly payment amount but significantly increase the total interest paid over the life of the loan.
Interest rates vary based on credit scores, ranging from 4-7% for prime borrowers to 12%+ for subprime financing.
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