How to use the Car Loan EMI Calculator
This calculator finds the fixed monthly installment (EMI - Equated Monthly Installment) needed to pay off a car loan, using the same reducing-balance amortization formula lenders use for auto financing. Enter the car's price, your down payment, the annual interest rate (APR), and the loan term to see the monthly payment, total interest, and total cost.
How the EMI formula works
The standard formula is EMI = P × r × (1 + r)^n / ((1 + r)^n − 1), where P is the loan principal (price minus down payment), r is the monthly interest rate (annual rate divided by 12, expressed as a decimal), and n is the total number of monthly payments (years × 12). If the rate is 0%, the formula reduces to EMI = P / n, splitting the principal evenly across the term with no interest.
Down payment and loan amount
- Principal financed: only the amount you borrow (price minus down payment) accrues interest. A larger down payment lowers both the EMI and the total interest paid.
- Loan-to-value: lenders often price rates based on how much of the car's value is financed; a bigger down payment can also improve the rate you're offered, though this calculator uses the rate you enter directly.
Interest rate and total cost
Because EMI is a reducing-balance calculation, each payment first covers interest on the outstanding balance, and the remainder pays down principal. Early payments are interest-heavy; later payments are principal-heavy. A higher APR or a longer term both increase total interest paid, even though a longer term lowers the monthly EMI itself — so comparing offers means checking total interest, not just the monthly figure.