Your personal loan EMI is worked out with one standard formula: EMI = P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1), where P is the loan amount, r is the monthly interest rate, and n is the number of months. For a ₹1 lakh loan at 14% a year over 4 years, that works out to an EMI of about ₹2,733 a month.
Every bank and NBFC in India uses the same maths, so once you understand the three inputs — amount, rate, tenure — you can estimate any EMI yourself and check whether a lender's quote is fair.
The formula that decides your EMI
The Equated Monthly Installment (EMI) is a fixed monthly payment that clears both the interest and the principal by the end of the tenure. The formula is:
EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1)
It looks heavy, but it is just a way of spreading an unequal debt into equal monthly payments. The same equation runs behind every online EMI calculator you have ever used.
What each part of the formula means
Three inputs decide the number:
P — Principal. The loan amount sanctioned, say ₹3,00,000.
r — Monthly interest rate. The annual rate divided by 12, then by 100. A 14% annual rate becomes 14 ÷ 12 ÷ 100 = 0.01167 per month.
n — Tenure in months. A 4-year loan is 48 months.
Get these three right and the EMI is fixed. Change any one and the monthly figure moves.
A worked example: ₹3 lakh at 14%
Take P = ₹3,00,000, an annual rate of 14% (so r = 0.01167), and n = 48 months.
Plugging into the formula gives an EMI of about ₹8,199 a month. Over 48 months you pay back roughly ₹3,93,552 in total — meaning about ₹93,552 is interest and the rest is your principal.
In the early months most of your EMI goes toward interest; as the balance falls, more of each payment chips away at the principal. This split is called an amortisation schedule. Here is how the same ₹8,199 EMI is split across the tenure:
Month | EMI | Interest | Principal | Balance |
|---|---|---|---|---|
1 | ₹8,199 | ₹3,500 | ₹4,699 | ₹2,95,301 |
2 | ₹8,199 | ₹3,446 | ₹4,753 | ₹2,90,548 |
3 | ₹8,199 | ₹3,390 | ₹4,809 | ₹2,85,739 |
24 | ₹8,199 | ₹2,024 | ₹6,175 | ₹1,67,270 |
48 | ₹8,199 | ₹95 | ₹8,104 | ₹0 |
Notice how the interest portion shrinks every month while the principal portion grows, even though the EMI itself never changes. By the final month, almost the entire payment is principal. This is exactly why prepaying early — when the interest share of each EMI is at its highest — saves you far more than prepaying near the end of the loan.
EMI per ₹1 lakh, by tenure
The quickest way to estimate any EMI is to start from the cost per ₹1 lakh, then multiply by how many lakhs you are borrowing. Here is the EMI for every ₹1 lakh at 14% a year:
Tenure | EMI per ₹1 lakh | Total interest per lakh |
|---|---|---|
1 year | ₹8,979 | ₹7,748 |
2 years | ₹4,801 | ₹15,224 |
3 years | ₹3,418 | ₹23,048 |
4 years | ₹2,733 | ₹31,184 |
5 years | ₹2,327 | ₹39,620 |
So a ₹5 lakh loan over 4 years is simply ₹2,733 × 5 = about ₹13,665 a month.
How tenure changes your EMI
Tenure works in two directions, and this is where most borrowers get caught out.
A longer tenure lowers the monthly EMI because you spread the same principal over more months — easier on your monthly budget. But you pay interest for longer, so the total interest rises sharply. The table above shows it clearly: stretching from 1 year to 5 years cuts the monthly EMI by nearly two-thirds, but the total interest per lakh jumps more than five times.
Pick the shortest tenure whose EMI still fits comfortably within your budget — ideally keeping all your EMIs within about 40–50% of your take-home pay.
How the interest rate changes your EMI
The rate has a smaller month-to-month effect than tenure, but it decides your total cost. Here is the EMI on a ₹3 lakh loan over 4 years at different rates:
Annual rate | EMI (₹3L, 4 yr) | Total interest |
|---|---|---|
11% | ₹7,758 | ₹72,384 |
14% | ₹8,199 | ₹93,552 |
18% | ₹8,806 | ₹1,22,688 |
22% | ₹9,438 | ₹1,53,024 |
Personal loan rates in India generally run from about 11% to 24% a year, depending on your credit profile and lender. A better CIBIL score usually earns a lower rate — which is why the same loan can cost very different amounts for two people.
Reducing balance and flat rate explained
Two lenders can quote the "same" rate and charge very different amounts, because there are two ways to calculate interest:
Reducing balance: interest is charged only on the outstanding principal, which falls every month. The EMI formula above assumes this method. It is the honest, standard method, and it is what regulated banks and NBFCs use for personal loans.
Flat rate: interest is charged on the full original principal for the whole tenure, so it does not fall as you repay. A 10% flat rate is roughly equivalent to a 17–18% reducing-balance rate — almost double the real cost.
The gap matters because a flat-rate quote always looks cheaper. If one lender offers "10% flat" and another "16% reducing", the reducing-balance loan is usually the cheaper of the two once you do the maths. Always ask which method a quote uses, and compare offers on the reducing-balance rate only. If a lender will not tell you, treat that as a warning sign.
What to check before you commit
The EMI is not the only number that matters. Before you sign:
Processing fee — usually 1–3% of the loan, often deducted upfront, so you receive slightly less than sanctioned.
Prepayment or foreclosure charges — some lenders penalise you for paying early.
Total cost of the loan — EMI × number of months, so you see the full amount you will repay, not just the monthly figure.
Your FOIR — lenders cap your total EMIs at around 40–55% of net income, so a high EMI can shrink how much you qualify for.
Running the numbers on an EMI calculator like the one from True Balance before you apply lets you test different tenures and amounts, so you pick an EMI you can actually sustain.
Common questions
Is EMI calculated on reducing balance or flat rate? Genuine EMI, as per the standard formula, is calculated on a reducing balance — interest applies only to the outstanding principal. Be cautious of "flat rate" quotes, which cost far more for the same headline number.
Does paying a higher EMI reduce my total interest? Yes. A higher EMI usually means a shorter tenure, and a shorter tenure means less total interest, even though the monthly outgo is larger.
Can I change my EMI after the loan starts? Sometimes. A few lenders allow you to prepay a lump sum (which lowers future EMIs or shortens the tenure) or restructure the loan, though charges may apply.
Why is my EMI higher than an online calculator showed? Usually because the lender's actual rate, processing fee, or insurance add-ons differ from the figures you entered. Always calculate with the final sanctioned rate.
How do I estimate an EMI without a calculator? Use the per-lakh shortcut. Find the EMI for ₹1 lakh at your rate and tenure — for 14% over 4 years it is ₹2,733 — then multiply by the number of lakhs you are borrowing. For a ₹4 lakh loan that is ₹2,733 × 4 = about ₹10,932 a month. It is not exact to the rupee, but it lands within a few hundred rupees, which is close enough to compare offers or sanity-check a lender's quote before you sign.
Does a missed EMI change my future EMIs? The scheduled EMI stays the same, but a missed payment adds late-payment penalties and extra interest on the overdue amount, and it is reported to the credit bureaus. Even one or two late EMIs can pull down your CIBIL score and make your next loan costlier, so it is worth setting up an auto-debit mandate.
Figures here are illustrative, based on standard reducing-balance EMI maths and typical Indian personal loan rates of about 11–24% a year as of 2026. Your actual EMI depends on the exact amount, rate, and tenure your lender approves — confirm all charges before borrowing.