How is personal loan EMI calculated?
EMI stands for Equated Monthly Instalment — the single fixed amount you pay each month over the tenure of your personal loan. This guide explains the formula in plain English, walks through a worked example on a ₹5 lakh loan, and shows how tenure and interest rate change what you actually pay.
By Aditi Menon·Editor-in-Chief·reviewed by editor
Last updated: 15 June 2025
What EMI actually means
An EMI is a level payment: the same rupee amount every month. Inside that fixed number, two things are moving in opposite directions — the interest portion falls each month, and the principal portion rises. By the last EMI, almost the entire payment is going toward principal. This mechanism is called amortisation and is used by every scheduled bank in India for personal, home, and auto loans.
The EMI formula (with each variable explained)
EMI = [P × R × (1+R)ⁿ] ÷ [(1+R)ⁿ – 1]
P = Principal (the loan amount disbursed to you)
R = Monthly interest rate, expressed as a decimal. If the bank quotes 12% per annum, R = 12 ÷ 12 ÷ 100 = 0.01
n = Tenure in months. A 3-year loan is n = 36.
Every Indian bank uses this same reducing-balance formula. What varies is R (your rate depends on credit score and profile) and n (the tenure you pick). P is the number you asked for.
Worked example — ₹5 lakh personal loan at 12% for 3 years
Illustration only (not a lender quote). We use round numbers on purpose so you can follow the math.
P = ₹5,00,000
R = 12% ÷ 12 ÷ 100 = 0.01
n = 36 months
(1+R)ⁿ = (1.01)³⁶ ≈ 1.4308
EMI = (5,00,000 × 0.01 × 1.4308) ÷ (1.4308 – 1)
EMI = 7,154 ÷ 0.4308
EMI ≈ ₹16,607 per month
Total paid over 36 months: ₹16,607 × 36 = ₹5,97,860
Total interest cost: ₹5,97,860 – ₹5,00,000 = ₹97,860
So on a ₹5 lakh loan at 12% for 3 years, roughly ₹98,000 of your money goes to the bank as interest and ₹5 lakh returns to it as principal.
How tenure changes the picture
Same ₹5 lakh, same 12% rate. Stretching from 2 years to 5 years cuts the EMI by roughly half, but nearly triples the total interest cost. Pick the shortest tenure your monthly cash flow can comfortably absorb — that is where the total-cost saving lives.
| Tenure | Monthly EMI | Total interest paid | Total repaid |
|---|---|---|---|
| 2 years | ₹23,537 | ₹64,893 | ₹5,64,893 |
| 3 years | ₹16,607 | ₹97,860 | ₹5,97,860 |
| 4 years | ₹13,167 | ₹1,32,022 | ₹6,32,022 |
| 5 years | ₹11,122 | ₹1,67,333 | ₹6,67,333 |
How the interest rate changes the picture
The EMI difference between 10.5% and 15% looks small (₹1,082 a month), but the total interest gap is nearly ₹39,000 over the same tenure. This is why negotiating the rate — or waiting a few months to lift your credit score — pays back concretely.
| Interest rate (3-year tenure) | Monthly EMI | Total interest paid |
|---|---|---|
| 10.5% p.a. | ₹16,251 | ₹85,051 |
| 12.0% p.a. | ₹16,607 | ₹97,860 |
| 13.5% p.a. | ₹16,969 | ₹1,10,884 |
| 15.0% p.a. | ₹17,333 | ₹1,24,126 |
| 18.0% p.a. | ₹18,076 | ₹1,50,748 |
Advertisement
What amortisation looks like inside a single EMI
On the ₹5 lakh / 12% / 3-year example, your very first EMI of ₹16,607 splits like this:
Interest portion: ₹5,00,000 × 0.01 = ₹5,000
Principal portion: ₹16,607 – ₹5,000 = ₹11,607
After EMI 1, outstanding principal is ₹4,88,393. Interest for EMI 2 is calculated on that new lower principal (₹4,88,393 × 0.01 = ₹4,884), so slightly more of EMI 2 goes to principal. This shift continues every month.
The practical implication: prepayments made in the first year kill interest for many years to come. Prepayments made in the last year barely save anything.
Repayment tips that reduce actual cost
- Pick the shortest tenure your monthly budget can absorb without stress — the interest saving compounds.
- Set up auto-debit so you never miss an EMI: even one missed EMI costs a bounce fee, a late-payment fee, and 30–80 CIBIL points.
- When you get an annual bonus or windfall, prepay a lump sum — most banks allow part-payment after 6–12 EMIs with zero or low charges on floating-rate loans.
- If your rate is 150+ bps above current market, request an in-bank rate reset before considering a balance transfer to another lender.
- Do not over-borrow to “consolidate” unless the consolidated rate is meaningfully lower than the debt you’re replacing.
Skip the math — use the calculator
You do not have to compute the formula by hand. Our personal-loan EMI calculator applies the same reducing-balance formula shown above, updates the total-interest and total-repayment numbers as you move the sliders, and shows the principal vs. interest split in a chart. Use it for any P, R, and n you want to test.
Frequently Asked Questions
Sources & references
- RBI — Master Direction on Regulatory Framework for Retail Lending — Reserve Bank of India
- RBI FAQ — Reset of floating interest rates on EMI-based personal loans — Reserve Bank of India
- CBIC — GST applicability on financial services — Central Board of Indirect Taxes & Customs
Rates, fees, eligibility, and product terms cited on this page reflect the sources above at the time of publication and may have changed since. Always verify directly with the lender or regulator.