How EMI is Calculated in India — Formula & Step-by-Step Example
Home Loan How EMI is Calculated in India — Formula, Step-by-Step Example By CalcBharat.com Finance Team · April 2026 · 8 min read
EMI (Equated Monthly Installment) is the fixed amount you pay to your bank every month to repay a loan. Each EMI has two components: interest and principal. Understanding exactly how it’s calculated helps you make smarter loan decisions.
📌 Use our Free EMI Calculator — instant results without doing the math yourself.
The EMI Formula
EMI = P × r × (1+r)^n / ((1+r)^n - 1)
P = Principal loan amount | r = Monthly interest rate (annual rate ÷ 12 ÷ 100) | n = Loan tenure in months
Worked Example — Rs 30 Lakh Home Loan, 8.5%, 20 Years
Step 1: P = 30,00,000. Annual rate = 8.5%, so monthly rate r = 8.5/12/100 = 0.007083. Tenure n = 20 × 12 = 240 months.
Step 2: (1+r)^n = (1.007083)^240 = 5.3133
Step 3: EMI = 30,00,000 × 0.007083 × 5.3133 / (5.3133 - 1) = 30,00,000 × 0.007083 × 5.3133 / 4.3133
Step 4: EMI = Rs 26,035 per month
How EMI Splits Between Principal and Interest (Amortization)
Here’s what your Rs 26,035 EMI looks like in the first 6 months on a Rs 30 lakh loan at 8.5%:
| Month | EMI | Interest Portion | Principal Portion | Balance Remaining |
1Rs 26,035Rs 21,250Rs 4,785Rs 29,95,215 |
2Rs 26,035Rs 21,216Rs 4,819Rs 29,90,396 |
3Rs 26,035Rs 21,182Rs 4,853Rs 29,85,543 |
6Rs 26,035Rs 21,079Rs 4,956Rs 29,70,940 |
60 (Yr 5)Rs 26,035Rs 19,429Rs 6,606Rs 27,40,004 |
120 (Yr 10)Rs 26,035Rs 16,743Rs 9,292Rs 23,61,455 |
240 (Yr 20)Rs 26,035Rs 183Rs 25,852Rs 0 |
Notice: in Month 1, Rs 21,250 of your Rs 26,035 EMI is pure interest — only Rs 4,785 reduces your principal. In Year 10, you still owe Rs 23.6 lakh of the original Rs 30 lakh. This is why prepayment in early years is so powerful.
Why Early EMIs Are Mostly Interest
This happens because interest is charged on the outstanding balance. When the balance is high (early in the loan), interest is high. As you pay down principal month by month, the interest portion shrinks and the principal portion grows — but slowly at first.
How Prepayment Dramatically Reduces Total Interest
On the Rs 30 lakh, 8.5%, 20-year loan: Total interest without prepayment = Rs 32.48 lakh. If you prepay Rs 2 lakh at the end of Year 1: you save approximately Rs 5.1 lakh in interest and close the loan 2 years early.
Why is early prepayment so powerful? Because the Rs 2 lakh reduces principal immediately — and every month after that, interest is calculated on a smaller base.
📌 Read more: 7 Smart Ways to Reduce Your Home Loan EMI in 2026
📌 Compare banks: Best Home Loan Banks in India 2026 — Rates Compared
🏠CalcBharat.com Finance TeamHome Loan & Finance ExpertsAll calculations verified using standard financial formulas. Actual EMI may vary slightly by lender due to rounding. Last updated: April 2026.
Frequently Asked Questions
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Use Free EMI CalculatorFrequently Asked Questions
EMI = P × r × (1 + r)^n ÷ ((1 + r)^n − 1). P = loan amount, r = monthly interest rate (annual rate ÷ 12 ÷ 100), n = tenure in months. All Indian banks use this standard reducing balance formula — the same one in our EMI calculator.
Because the outstanding balance reduces with each payment. Lower balance = less interest charged that month = more of the same EMI goes to principal. This is amortization. In year 1 of a 20-year loan, ~80% of your EMI is interest. By year 18, ~80% is principal.
At 8.5% for 20 years: ₹43,391/month. At 9% for 20 years: ₹44,986/month. At 8.5% for 15 years: ₹49,245/month. Total repayment on the 20-year option: ~₹1.04 crore — you pay ₹54 lakh in interest on a ₹50 lakh loan.
Most banks let you choose. Reducing tenure saves more total interest (recommended if you can afford it). Reducing EMI improves monthly cash flow. For floating rate home loans, RBI prohibits prepayment penalties — so prepay whenever you have surplus funds.
Keep total EMIs under 40% of net take-home. Banks approve up to 50–55% FOIR but 40% is financially healthier. At ₹70,000 take-home, keep all EMIs under ₹28,000 combined. Factor in existing car loans or personal loans before taking a home loan.