How EMI Is Calculated: Formula, Example and Tips
By BizToolsIndia Editorial Team · Updated · Finance Calculators
Quick answer
EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1), where P is the loan amount, r the monthly interest rate (annual rate ÷ 12 ÷ 100) and n the number of months. A ₹5 lakh loan at 11% for 3 years has an EMI of ₹16,369.36 and total interest of about ₹89,297.
Skip the maths — use the Business Loan EMI Calculator →
The formula, step by step
EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1)
- Convert the annual rate to a monthly rate: 11% ÷ 12 ÷ 100 = 0.009167.
- Count the instalments: 3 years × 12 = 36.
- Plug in P = ₹5,00,000: EMI = ₹16,369.36.
Longer tenure: smaller EMI, more interest
| Tenure | EMI | Total interest |
|---|---|---|
| 2 years | ₹23,303.92 | ₹59,294 |
| 3 years | ₹16,369.36 | ₹89,297 |
| 5 years | ₹10,871.21 | ₹1,52,273 |
Stretching this loan from 2 to 5 years cuts the EMI by more than half but more than doubles the interest. Choose the shortest tenure whose EMI your cash flow can comfortably carry.
Why early EMIs are mostly interest
Interest is charged on the outstanding balance, which is highest at the start. In the first year of the 3-year example above, about ₹47,647 of your EMIs goes to interest and ₹1,48,785 to principal. By the last year the split has reversed. That's why part-prepayments in the early years save the most.
EMIs for common loan sizes
| Loan | Rate | Tenure | EMI | Total interest |
|---|---|---|---|---|
| ₹5,00,000 | 11% | 3 years | ₹16,369.36 | ₹89,297 |
| ₹5,00,000 | 14% | 3 years | ₹17,088.81 | ₹1,15,197 |
| ₹10,00,000 | 10% | 5 years | ₹21,247.04 | ₹2,74,823 |
| ₹20,00,000 | 9% | 10 years | ₹25,335.15 | ₹10,40,219 |
A 3-point higher rate on the ₹5 lakh loan adds only about ₹720 to the EMI but ₹25,900 to total interest. Compare loans on total cost, not EMI.
Year-by-year: where your EMIs go
| Year | Principal repaid | Interest paid | Balance at year end |
|---|---|---|---|
| 1 | ₹1,48,785 | ₹47,647 | ₹3,51,215 |
| 2 | ₹1,66,003 | ₹30,430 | ₹1,85,212 |
| 3 | ₹1,85,212 | ₹11,220 | ₹0 |
Part-prepayment: how much it saves
Suppose you prepay ₹1,00,000 after the 12th EMI of the ₹5 lakh loan above and keep paying the same EMI. The loan closes after 29 EMIs instead of 36, and total interest falls from about ₹89,297 to about ₹68,428 — a saving of roughly ₹20,900. The earlier you prepay, the more you save, because the balance you remove would otherwise have attracted interest for longer.
Note
Flat rate vs reducing balance
Some lenders quote a flat rate, where interest is charged on the original loan amount for the whole tenure. A “flat 11%” on ₹5 lakh for 3 years means ₹1,65,000 of interest and an EMI of ₹18,472.22 — equivalent to a reducing-balance rate of about 19.6%, not 11%. Always ask for the reducing-balance rate or the total amount payable.
| ₹5 lakh for 3 years | EMI | Total interest |
|---|---|---|
| 11% reducing balance | ₹16,369.36 | ₹89,297 |
| 11% flat | ₹18,472.22 | ₹1,65,000 |
The full cost of a business loan
- Processing fee: often a percentage of the loan, with 18% GST on the fee.
- Insurance or other add-ons bundled into the loan amount raise the principal you pay interest on.
- Late payment charges and bounce fees add up quickly if cash flow is tight.
- Floating rates can change during the tenure; the lender may change the EMI or the tenure.
Plan the EMI against your monthly cash flow with the Working Capital Calculator, and check that the investment the loan funds earns more than it costs with the ROI Calculator.
Choosing a tenure you can afford
- Work out how much cash your business (or household) reliably has left each month after all other commitments, using a lean month rather than an average one.
- Keep the EMI comfortably within that figure, leaving a buffer for slow months and unexpected costs.
- Find the shortest tenure whose EMI fits. Every extra year adds interest.
- If the EMI for a sensible tenure doesn't fit, consider a smaller loan or a larger down payment rather than stretching the tenure.
- Plan for rate changes: on a floating-rate loan, check what happens to the EMI if the rate rises by 1–2 points.
EMI loan or overdraft?
Term loans with EMIs suit one-time purchases such as machinery, vehicles or renovation, where the asset earns money over several years. For stock and day-to-day cash gaps, an overdraft or cash credit limit is often cheaper, because interest is charged only on the amount used and only for the days it is used. Matching the type of borrowing to its purpose keeps interest costs down.
Calculating the EMI by hand
Here is the ₹5 lakh, 11%, 3-year example worked through in full, so you can check any lender's figure:
- Monthly rate r = 11 ÷ 12 ÷ 100 = 0.0091667.
- Number of months n = 36.
- (1 + r)ⁿ = 1.0091667³⁶ = 1.388879.
- P × r = 5,00,000 × 0.0091667 = 4,583.33.
- Numerator = 4,583.33 × 1.388879 = 6,365.69.
- Denominator = 1.388879 − 1 = 0.388879.
- EMI = 6,365.69 ÷ 0.388879 = ₹16,369.36.
Multiply by 36 to get total repayments of about ₹5,89,297, of which ₹89,297 is interest. The Business Loan EMI Calculator shows the full year-by-year schedule.
Loan terms worth knowing
- Principal: the amount borrowed.
- Tenure: the repayment period, in months.
- Amortisation schedule: the month-by-month split of each EMI into interest and principal.
- Foreclosure: repaying the whole outstanding balance before the tenure ends.
- Moratorium: an agreed period with no or reduced EMIs; interest usually keeps accruing and is added to the loan.
Frequently asked questions
Is EMI calculated on a flat or reducing balance?
Most bank loans use the reducing balance method shown here. Some lenders quote a flat rate, which looks lower but costs more — always compare the reducing-balance rate or the total amount payable.
Does the processing fee change the EMI?
No, but it adds to the cost of the loan. The Business Loan EMI Calculator can include it in the total.
Can I calculate EMI in Excel?
Yes. Use =PMT(annual_rate/12, months, -loan_amount). For ₹5 lakh at 11% for 36 months: =PMT(11%/12, 36, -500000) gives ₹16,369.36.
Is it better to reduce EMI or tenure after a prepayment?
Reducing the tenure saves more interest. Reducing the EMI eases monthly cash flow. Choose based on which matters more to you.
What happens to my EMI if the interest rate rises?
On a floating-rate loan, the lender either increases the EMI or extends the tenure. Extending the tenure keeps the EMI the same but increases total interest.
Is the interest on a business loan tax-deductible?
Interest on money borrowed for business purposes is generally an allowable business expense. The principal portion of the EMI is not an expense.
Is the EMI formula the same for home, car and business loans?
Yes. Any reducing-balance loan with fixed monthly instalments uses the same formula. What differs is the interest rate, tenure, fees and whether the rate is fixed or floating.
Why does my loan statement show a slightly different EMI?
Lenders round the EMI, may calculate interest on a daily basis, and can have a broken-period interest charge for the first month. Differences of a few rupees are normal.
Does a lower EMI always mean a cheaper loan?
No. A lower EMI often comes from a longer tenure, which raises total interest. Compare the total amount payable, including fees.
How much of my first EMI is interest?
Multiply the loan amount by the monthly rate. On ₹5 lakh at 11%, the first month's interest is 5,00,000 × 0.0091667 ≈ ₹4,583, so only about ₹11,786 of the ₹16,369 EMI reduces the loan.