Complete guide
Reviewed July 2026An EMI (Equated Monthly Instalment) is the fixed amount you pay your lender every month until a loan is fully repaid. Each EMI contains two parts — interest on the outstanding balance and repayment of principal — and the split between them changes every single month, which is why loans feel expensive early and cheap late.
This EMI calculator gives you the exact monthly instalment for any loan amount, interest rate and tenure using the standard reducing-balance formula that banks and NBFCs use. It also shows total interest payable, a principal-versus-interest breakdown chart, and a complete month-by-month amortization schedule.
Before you sign any loan agreement, spend two minutes here: small changes in rate or tenure produce surprisingly large changes in total interest, and seeing the numbers is the fastest way to negotiate better terms.
What is an EMI?
EMI stands for Equated Monthly Instalment — 'equated' because the payment is identical every month even though its internal composition shifts. In the first month of a ₹50 lakh home loan at 9% for 20 years, roughly ₹37,500 of your ₹44,986 EMI is pure interest and only ₹7,486 reduces your debt. By the final year, those proportions are reversed.
This front-loading of interest is not a lender trick; it is arithmetic. Interest is charged each month on whatever you still owe, and you owe the most at the start. Understanding this explains almost every practical EMI question: why prepaying early saves the most, why short tenures cost so much less in total, and why your loan balance barely moves in the early years.
EMI formula explained
EMI = P × r × (1 + r)^n / ((1 + r)^n − 1) where: P = loan principal (amount borrowed) r = monthly interest rate = annual rate ÷ 12 ÷ 100 n = tenure in months
This is the standard amortization formula used worldwide for reducing-balance loans. 'Reducing balance' means interest accrues only on the outstanding principal, not the original loan amount — the borrower-friendly method used for virtually all home, car and personal loans from regulated lenders.
Step-by-step calculation
- Loan: ₹10,00,000 at 9% p.a. for 10 years.
- Monthly rate r = 9 ÷ 12 ÷ 100 = 0.0075.
- Months n = 10 × 12 = 120.
- (1.0075)^120 = 2.4514.
- EMI = 10,00,000 × 0.0075 × 2.4514 ÷ (2.4514 − 1) = 18,386 ÷ 1.4514 ≈ ₹12,668.
- Total paid = 12,668 × 120 = ₹15,20,109; total interest = ₹5,20,109 — about 52% of the amount borrowed.
Watch out for flat-rate loans
Some financiers (especially for two-wheelers, consumer durables and informal business loans) quote a 'flat rate', charging interest on the full original principal for the entire tenure. A 9% flat rate is roughly equivalent to a 16–17% reducing-balance rate. Always ask which method applies; this calculator uses reducing balance, the honest benchmark.
What drives your EMI — worked examples
Two lessons jump out. First, stretching tenure from 15 to 25 years lowers the EMI by just 18% but nearly doubles the total interest. Second, each 1% of interest rate on a 20-year loan adds roughly ₹4.6 lakh in cost on ₹30 lakh borrowed — which is why negotiating even 0.25% off, or transferring the balance to a cheaper lender, is worth real money.
| Rate | Tenure | Monthly EMI | Total interest | Interest as % of loan |
|---|---|---|---|---|
| 8.5% | 15 yrs | ₹29,542 | ₹23.2 L | 77% |
| 8.5% | 20 yrs | ₹26,035 | ₹32.5 L | 108% |
| 8.5% | 25 yrs | ₹24,157 | ₹42.5 L | 142% |
| 9.5% | 20 yrs | ₹27,964 | ₹37.1 L | 124% |
| 10.5% | 20 yrs | ₹29,951 | ₹41.9 L | 140% |
The prepayment effect
Because interest accrues on the outstanding balance, every rupee prepaid early avoids interest for the entire remaining tenure. On the ₹30 lakh / 8.5% / 20-year loan above, a single ₹2 lakh prepayment in year 2 (keeping the EMI unchanged) shortens the loan by about 2.5 years and saves roughly ₹6 lakh in interest. Most floating-rate loans in India carry no prepayment penalty for individual borrowers.
How to use this calculator
- Enter the loan amount you plan to borrow (not the property or car price — subtract your down payment).
- Set the annual interest rate quoted by your lender. For floating-rate loans, use the current effective rate.
- Choose the tenure in years. Try 2–3 tenures and compare total interest, not just the EMI.
- Read the EMI, total payment and total interest cards, then open the Schedule tab to see the month-by-month principal/interest split and closing balance.
- Stress-test affordability: your total EMIs should stay within 40–50% of net monthly income (lenders call this FOIR).
Advantages, limitations and common mistakes
Why calculate before you borrow
- Compare lenders on total cost, not headline EMI.
- Pick the shortest tenure your cash flow genuinely supports.
- See exactly how much a prepayment or rate cut is worth.
- Plan the loan around FOIR so a future rate rise doesn't break your budget.
What the calculator doesn't include
- Processing fees (typically 0.25–1% of loan), stamp duty and insurance premiums bundled by lenders.
- Floating-rate resets — your EMI or tenure changes when the repo-linked rate moves.
- Moratorium or step-up EMI structures offered on some construction-linked home loans.
Common mistakes
- Choosing the longest tenure by default 'to be safe' — it can double total interest; you can always prepay, but you can't easily raise the EMI later with some lenders.
- Comparing a flat-rate quote with a reducing-balance quote as if they were the same thing.
- Ignoring the annual rate reset on floating loans when budgeting.
- Borrowing to the maximum FOIR the bank allows, leaving no room for rate hikes or emergencies.
Frequently asked questions
Glossary
- Principal
- The amount you borrow, on which interest is calculated.
- Reducing balance
- Interest computed each period on the outstanding balance rather than the original loan — the standard for bank EMIs.
- Amortization
- Gradual repayment of a loan through scheduled instalments that cover both interest and principal.
- Tenure
- The total repayment period of the loan, usually stated in months or years.
- FOIR
- Fixed Obligation to Income Ratio — the share of income committed to EMIs; lenders cap it around 40–55%.
- Prepayment
- Paying part of the principal before schedule, which reduces future interest.
- Foreclosure
- Closing the loan entirely before the end of tenure by paying the outstanding balance.
- Pre-EMI
- Interest-only payments on partially disbursed loans, common in under-construction home purchases.
- Floating rate
- An interest rate linked to a benchmark (like the repo rate) that resets periodically.
Key takeaways
The EMI formula rewards two behaviours above all: borrowing at the lowest honest (reducing-balance) rate you can negotiate, and keeping tenure as short as your cash flow allows. Use the amortization schedule to understand where each payment goes, prepay early rather than late, and keep total EMIs under 40% of your income so the loan serves you — not the other way around.
Enter your loan details above, then try shortening the tenure by five years and see what happens to total interest.