What the EMI Calculator Does
EMI stands for Equated Monthly Instalment — the fixed amount you repay every month on a loan until it is fully cleared. This calculator works out that monthly figure, plus the total amount you will repay and the total interest you will pay over the life of the loan. It works for any amortising loan: home loans, personal loans, car loans and more, and is used widely in India and other markets that quote loans in EMI terms.
The Inputs You Enter
- Loan Amount – the principal you are borrowing.
- Monthly Interest Rate (%/month) – the interest rate per month. Note this calculator asks for the monthly rate directly, not the annual rate. If your lender quotes an annual rate, divide it by 12 first (for example, 10.8% per year ≈ 0.9% per month).
- Loan Term (months) – the number of monthly instalments, e.g. 240 months for a 20-year loan.
The Formula Used
The calculator applies the standard reducing-balance EMI formula:
$$\text{EMI} = \frac{\text{Loan Amount} \cdot r \cdot \left(1 + r\right)^{\text{Months}}}{\left(1 + r\right)^{\text{Months}} - 1}, \quad r = \frac{\text{Monthly Rate (\%)}}{100}$$
Here P is the principal, r is the monthly rate as a decimal (the percentage you enter divided by 100), and n is the number of months. If you enter a 0% rate, it simply divides the principal evenly across the months. Once the EMI is known, the tool multiplies it by the number of months to get the total payment, then subtracts the principal to reveal the total interest.
Worked Example
Suppose you borrow 1,000,000 at a monthly rate of 0.9% over 240 months. Converting \(r = 0.009\), then \((1.009)^{240} \approx 8.59\). The EMI works out to roughly $$1{,}000{,}000 \times 0.009 \times 8.59 \div 7.59 \approx 10{,}185 \text{ per month}$$ Over 240 months the total payment is about 2,444,000, meaning you pay around 1,444,000 in interest on top of the original amount borrowed.
Frequently Asked Questions
Is the rate annual or monthly? It is monthly. Divide an annual rate by 12 before entering it — for example, an annual 12% becomes 1% per month.
Why is total interest so high on long loans? Longer terms lower the monthly EMI but mean interest accrues over more periods, so the total interest grows. Shortening the term reduces total interest.
Does this include processing fees or insurance? No. The result reflects only principal and interest. Add any one-time fees separately to estimate your true cost.
