Car Loan Interest Calculator

A car loan is an amortising loan — you pay equal monthly instalments (EMI) that cover both principal and interest over the loan tenure. Because the balance is "reducing", each instalment pays a little more principal and a little less interest than the one before, and the total interest is far lower than a flat-rate calculation would suggest. For most households a car is the second biggest purchase after a home, so the interest line on the loan deserves the same attention as the showroom price.

The formula

EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1)

Where:

• P = loan amount (principal)
• r = monthly interest rate (annual rate ÷ 12 ÷ 100)
• n = total months (years × 12)

Worked example

₹8,00,000 loan at 8.5% for 5 years:

r = 8.5 ÷ 12 ÷ 100 = 0.007083
n = 5 × 12 = 60
EMI = 8,00,000 × 0.007083 × (1.007083)⁶⁰ ÷ ((1.007083)⁶⁰ − 1)
EMI ≈ ₹16,413

Total = 16,413 × 60 = ₹9,84,794
Interest = 9,84,794 − 8,00,000 = **₹1,84,794**

Over five years you hand back ₹9.85 lakh for a loan of ₹8 lakh. The ₹1.85 lakh gap is the real price of spreading the purchase over time — and it shrinks sharply if you shorten the tenure or extend the down payment.

Making the numbers work with the dealer

• Down payment matters more than rate. Financing ₹7,00,000 instead of ₹8,00,000 at the same rate cuts both the EMI and the total interest by about 12% — often a bigger saving than hunting a 0.5% lower rate.
• Dealers sometimes mark up the bank's rate. A dealership quotes "9% from our partner bank" while that bank's own counter shows 8.5%. Check the rate directly with the bank before agreeing, and factor in the processing fee (typically 0.5–1% of the loan).
• On-road price vs ex-showroom. Insurance, registration and accessories are often folded into the financed amount; this calculator works on the loan principal, so enter the amount you actually intend to borrow.

Tips to reduce car loan interest

• Higher down payment — reduces the principal, so less interest
• Shorter tenure — higher EMI but much less total interest
• Prepayments — even one extra payment per year can save lakhs
• Compare rates — public sector banks typically offer lower rates than private ones

Fixed vs floating rate

• Fixed rate — stays the same throughout; predictable but usually around 0.5–1% higher
• Floating rate — changes with market conditions (e.g., the RBI repo rate); it can move up or down, so model both directions before committing

The trap of flat-rate quotes

Some dealers quote a "flat rate" of, say, 5% on the full ₹8,00,000 for all five years. Flat-rate interest is computed on the original principal for the whole tenure, which makes the true reducing-balance equivalent roughly double the flat figure — a 5% flat rate is closer to a 9%+ reducing rate. If a quote uses flat language, ask the dealer to state the annual reducing-balance rate, or run the total payable through this calculator to see the real cost.

A car is a depreciating asset — the day you drive it out, its resale value drops. Short tenures and bigger down payments are how you avoid owing more than the car is worth later in the loan.