Before you sign a loan agreement, there is one number you absolutely must know: your EMI — the fixed monthly amount you'll repay. Get it wrong, and you could be stretching your budget thin for years. Get it right, and you'll choose the loan that fits your life.
This guide explains how EMI is calculated, what factors drive it, and shows you real worked examples for home, car, and personal loans — with a free calculator that also gives you a full amortization schedule in Excel.
EMI stands for Equated Monthly Installment. It is the fixed amount you pay your lender every month until the loan is fully repaid. Each EMI consists of two parts: a principal component and an interest component. In the early months, most of the EMI goes toward interest; over time, more goes toward the principal.
This is the standard reducing-balance EMI formula used by all banks in India and most lenders worldwide. It assumes interest is calculated on the outstanding balance — so the interest portion decreases every month as you repay the principal.
Your EMI is determined by exactly three things — and you can control two of them:
| Factor | Impact on EMI | Your control? |
|---|---|---|
| Principal (P) | Higher loan = higher EMI, linearly | Yes — borrow less or increase down payment |
| Interest Rate (r) | Even 0.5% lower = significant savings over 20yr | Partial — negotiate, compare lenders |
| Tenure (n) | Longer tenure = lower EMI but much more interest total | Yes — choose carefully |
An amortization schedule shows, month by month, exactly how much of your EMI goes to principal vs interest, and what your outstanding balance is after each payment. It is the single most important document for understanding your loan.
Most banks don't show this upfront. Our free EMI calculator generates a complete amortization schedule and lets you download it as an Excel file — so you can plan partial prepayments, compare offers, or just know exactly where your money is going.
Try all loan types — Home, Car, Personal, Education. Download your full schedule in Excel.
Calculate My EMI →An equated monthly instalment is derived from a single closed-form expression. If P is the principal, r is the monthly interest rate (the annual rate divided by twelve, then by a hundred), and n is the number of months, then:
EMI = P × r × (1 + r)n ÷ [(1 + r)n − 1]
Take a principal of 30,00,000 at 9% per annum over 20 years. Here r = 0.09 ÷ 12 = 0.0075 and n = 240. Working it through gives an EMI of about 26,992. Multiply by 240 and the total outflow is roughly 64,78,000, meaning the interest alone comes to about 34,78,000 — more than the amount borrowed. That single comparison is the most useful thing a borrower can look at before signing, and it is the number lenders quote least often.
Every instalment is the same size, but its composition shifts. Interest for a month is simply the outstanding balance multiplied by r; whatever is left of the EMI reduces the principal.
| Month | Opening balance | Interest | Principal repaid |
|---|---|---|---|
| 1 | 30,00,000 | 22,500 | 4,492 |
| 60 | 27,13,000 | 20,348 | 6,644 |
| 120 | 22,55,000 | 16,913 | 10,079 |
| 180 | 15,25,000 | 11,438 | 15,554 |
| 240 | 26,790 | 201 | 26,791 |
In the first year, roughly five-sixths of what you pay is interest. This front-loading explains two things borrowers find counter-intuitive: why the outstanding balance barely moves in the early years, and why prepayments made early are dramatically more effective than the same amount paid later.
Lengthening the tenure lowers the monthly figure and raises the total substantially. On the same 30,00,000 at 9%:
| Tenure | EMI | Total interest |
|---|---|---|
| 10 years | 38,003 | 15,60,000 |
| 15 years | 30,428 | 24,77,000 |
| 20 years | 26,992 | 34,78,000 |
| 25 years | 25,175 | 45,52,000 |
| 30 years | 24,140 | 56,90,000 |
Moving from 20 to 30 years saves about 2,850 a month and costs about 22,00,000 more overall. Neither choice is automatically right, but the trade-off should be made with the second column visible, not just the first.
An advertised EMI covers principal and interest only. Budget separately for the processing fee, typically half a per cent to one per cent of the sanctioned amount; legal and technical valuation charges; stamp duty on the loan agreement where applicable; mandatory property insurance; and any credit-life cover the lender bundles in. Where that cover is financed into the loan itself, it quietly raises the principal and therefore every instalment.
Most Indian retail loans are now benchmarked to an external reference rate with a fixed spread. When the benchmark moves, lenders usually hold the EMI steady and adjust the tenure instead. A one-percentage-point rise on a 20-year loan can extend the term by several years without your monthly outgo changing at all, which is why the rate reset letter deserves more attention than it typically gets. You can normally request that the EMI be increased instead so the tenure stays fixed.
Because interest accrues on the outstanding balance, a lump sum paid early removes every future interest charge that balance would have generated. On the example loan, paying an extra 1,00,000 in year two cuts total interest by well over 4,00,000 and shortens the term by roughly a year. The identical payment in year fifteen saves a small fraction of that. Under current regulations, floating-rate home loans to individuals carry no prepayment penalty; fixed-rate loans and most personal loans often do, so check the sanction letter.
Sanctioned eligibility is what the lender is willing to risk, not what is comfortable. A widely used rule of thumb keeps all EMIs combined below about forty per cent of take-home pay, leaving room for rate resets and income interruptions.
A lower EMI over a longer term is not a better deal. Compare total interest, or compare EMIs at an identical tenure.
A "flat" rate is calculated on the original principal for the whole term and is roughly equivalent to nearly double that number on a reducing-balance basis. Some vehicle and consumer-durable loans are still quoted this way.
The calculation runs entirely in the page. Nothing about your loan amount, rate or tenure is transmitted anywhere. You can verify this by opening developer tools and watching the Network panel while you calculate, or by disconnecting from the internet after the page has loaded.
This information is general and educational. It is not financial advice, and it does not account for your circumstances, tax position or the specific terms of any lender's offer. Read your sanction letter carefully and consult a qualified adviser before committing to a long-term borrowing decision.
Interest each month is charged on the outstanding balance, which is at its largest at the start. As the balance falls, the interest portion shrinks and the principal portion grows, so the split reverses over the life of the loan.
It lowers the monthly burden but raises the total cost considerably. Stretching a 20-year loan to 30 years can add a very large amount of interest, so compare total interest rather than monthly figures alone.
No. The instalment covers principal and interest only. Processing fees, valuation charges, stamp duty and any insurance premium are separate, and bundled insurance financed into the loan increases the principal.
As early as possible. A lump sum in the first few years removes far more future interest than the same amount paid near the end, because it reduces a much larger outstanding balance for much longer.
On a floating-rate loan lenders usually keep the EMI the same and extend the tenure instead. You can normally ask for the reverse, keeping the tenure fixed and raising the instalment.
A flat rate charges interest on the original principal for the entire term, so the effective reducing-balance cost is roughly double the quoted figure. Always ask which basis a quote uses.
No. The calculation happens entirely inside your browser. You can confirm this in the Network panel of developer tools or by disconnecting from the internet before calculating.