Auto Loan Calculator
Estimate the monthly payment, total interest and full cost of a car loan, including your trade-in, sales tax and dealer fees.
Calc + compendium
Everyday answers, clearly calculated. Every Calcendium calculator shows its formula, states its assumptions and cites its sources, and it runs entirely in your browser.
$27,420 at 6.5% APR for 60 months
$536.50/ month
Three calculators built on one carefully tested amortization engine, each with a worked example, its assumptions and its limits.
Estimate the monthly payment, total interest and full cost of a car loan, including your trade-in, sales tax and dealer fees.
See how much interest and time you save by paying extra each month or making a one-time payment toward a fixed-rate loan.
Compare up to three loan offers side by side, including origination and other fees, to see which one actually costs the least.
Each calculator shows the math it uses, with a worked example you can verify by hand.
Calculations run in your browser. What you type is never sent to Calcendium or shared.
Definitions and rules link to official sources, and every calculator shows when it was last reviewed.
Results appear instantly. There is no account to create, no form to fill and no lead selling.
Every category follows the same standard: formulas on the page, cited sources and results calculated in your browser.
Exact decimal arithmetic, documented rounding, end-of-month payment timing and automated tests against known reference values. The methodology page explains it all.