What Is EMI?

EMI stands for Equated Monthly Installment — it's the fixed amount you pay your bank every month until the loan is fully repaid. Each EMI contains two parts: a portion that pays off the loan (principal) and a portion that pays for the cost of borrowing (interest).

The word "equated" is key — the total EMI stays the same every month (for fixed-rate loans), but the split between principal and interest changes. Early on, interest dominates. Over time, principal takes over.

The EMI Formula

EMI = P × r × (1 + r)ⁿ / ((1 + r)ⁿ − 1)

Where:

• P = Loan principal (the amount you borrow)

• r = Monthly interest rate = Annual rate ÷ 12 ÷ 100

• n = Total number of monthly payments (tenure in months)

A Real Example

Let's say you take a ₹30 lakh home loan at 8.5% for 20 years.

• P = 30,00,000

• r = 8.5 ÷ 12 ÷ 100 = 0.007083

• n = 20 × 12 = 240 months

Plugging into the formula: EMI = ₹26,035

Over 20 years, you'll pay ₹62.48 lakhs total — meaning ₹32.48 lakhs is interest. That's more than the original loan.

What Affects Your EMI?

Principal: Higher loan = higher EMI. Straightforward.

Interest rate: This has the biggest impact over time. A 1% increase on a ₹50 lakh, 20-year loan adds ~₹3,000/month to your EMI and ~₹7 lakhs to total interest.

Tenure: Longer tenure = lower EMI but significantly more total interest. A ₹50 lakh loan at 8.5% costs ₹54 lakhs in interest over 20 years, but ₹79 lakhs over 30 years.

Extra payments: Paying even a small amount above your EMI reduces principal faster, which reduces future interest. This is the single most powerful lever you have.

Fixed vs Floating Rate EMI

With a fixed rate, your EMI stays the same for the entire tenure. Predictable, but usually starts higher.

With a floating rate (most Indian home loans), the rate changes with market conditions. Your EMI can go up or down. Most banks adjust the tenure rather than the EMI — so if rates rise, your loan simply takes longer to pay off.

LoansLens lets you model both — and compare them side by side to see the total cost difference.

Calculate Your EMI

Enter your loan amount, rate, and tenure — get your full amortization schedule with monthly breakdowns, charts, and the ability to test prepayments instantly.