The EMI formula
An EMI (equated monthly instalment) is the fixed amount you pay every month on a loan. Banks calculate it with the standard reducing-balance formula: EMI = P × r × (1 + r)n ÷ ((1 + r)n − 1), where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12 ÷ 100) and n is the number of months. Early EMIs are mostly interest and later ones mostly principal, because interest is charged only on the balance still outstanding. For a ₹5,00,000 loan at 10.5% for 5 years, the EMI is about ₹10,747, the total interest is about ₹1,44,800 and you repay about ₹6,44,800 in all.
Home, car, personal and credit-card EMIs
The same formula works for every type of loan; only the rate and tenure change. Home loans run for 15–30 years at comparatively low rates, so the total interest can exceed the original amount even though each EMI looks manageable. Car and two-wheeler loans usually run for 3–7 years. Personal loans are unsecured and cost more. Credit-card EMI conversions often carry rates of around 13–24% a year plus a processing fee. Use the tenure switch to enter years or months.
What "no-cost EMI" really costs
No-cost EMI offers on phones, laptops and appliances are not interest-free loans. Usually the bank still charges interest at its normal rate, and the seller gives an upfront discount equal to that interest, so the sum of your EMIs equals the product price. Two costs remain. First, GST at 18% is charged on the interest component of every EMI and is billed to you. Second, many banks charge a processing fee (often ₹99–₹299) plus 18% GST on that fee. The second calculator estimates both: it works out the loan amount that, at the bank's rate, produces EMIs adding up to the price, then adds GST on the interest and the fee with GST.
Example: a ₹60,000 phone on 6-month no-cost EMI
At a 15% bank rate, roughly ₹2,540 of the ₹60,000 is interest offset by the discount. GST on that interest is about ₹460, and a ₹199 processing fee becomes about ₹235 with GST. So the "no-cost" purchase costs around ₹700 more than paying upfront, or a little over 1%. That can still be worth it for cash-flow reasons, but if the same seller offers an instant discount for full payment, compare the two. Note also that you may lose a cash discount that is only available on full payment.
How to reduce your EMI or total interest
- Bigger down payment: a smaller principal lowers both the EMI and the interest.
- Shorter tenure: a higher EMI, but often much less total interest.
- Part-prepayment: extra payments go to principal; floating-rate home loans for individuals generally have no prepayment penalty in India, but check your agreement.
- Balance transfer: move a high-rate loan to a lender with a lower rate, after counting the fees.
- Credit score: a strong score often helps you negotiate a better rate.
How much EMI can I afford?
A widely used rule of thumb is to keep all EMIs together below about 40% of take-home pay, and lenders look at a similar ratio (often called FOIR). Leave room for an emergency fund and insurance before committing to a long loan.
Flat rate vs. reducing balance
Some lenders, especially for consumer durables and vehicles, quote a "flat" interest rate, which is charged on the original loan amount for the whole tenure. A flat rate of 10% is much more expensive than a 10% reducing-balance rate; over three years it is roughly equivalent to an 18% reducing rate. Always ask for the reducing-balance rate or the annual percentage rate (APR), which by RBI rules must be disclosed in the key fact statement (KFS) for retail and MSME loans. This calculator uses the reducing-balance method.
Read the key fact statement
The KFS lists the APR, all fees and the full repayment schedule. Compare the KFS of two offers rather than the headline rates.
Missing an EMI
A missed or late EMI usually triggers a bounce charge, penal charges and a report to credit bureaus, which can lower your score for years. If you expect trouble, contact the lender before the due date; many offer a short restructuring or a change of EMI date.
Results are estimates; actual EMIs depend on the lender's rate, rounding and fees, and this is not financial advice. Need your bank's helpline for EMI conversion? Visit Credit Card Customer Care.
Frequently asked questions
How is EMI calculated?
EMI = P × r × (1+r)^n ÷ ((1+r)^n − 1), with r the monthly rate and n the number of months.
What is the EMI for ₹5 lakh at 10.5% for 5 years?
About ₹10,747 a month, with total interest of roughly ₹1.45 lakh.
Is no-cost EMI really free?
Not fully. You usually pay 18% GST on the interest portion and a processing fee with GST.
Why is GST charged on no-cost EMI?
Interest on credit-card EMI is treated as a taxable financial service charge, so GST at 18% applies to it.
Does prepaying a loan reduce EMI?
You can usually choose to reduce either the EMI or the remaining tenure after a part-prepayment.
What is a safe EMI-to-income ratio?
A common guideline is to keep total EMIs under about 40% of take-home pay.
Is this calculator accurate for my bank?
It uses the standard formula; your bank's figure may differ slightly due to rounding, fees or day-count methods.