EMI Calculator: Formula, Example and Loan Cost
An equated monthly instalment (EMI) is a fixed periodic payment for many amortising loans. It usually includes both interest and principal. An EMI estimate helps compare scenarios, but the lender’s agreement controls the actual payment schedule and charges.
1. What changes the EMI?
The main inputs are the principal borrowed, the interest rate, and the number of monthly payments. For the same principal and rate, a longer tenure usually reduces the monthly payment but can increase total interest.
Check whether the rate entered is annual or monthly and whether the tenure is in years or months. A unit mismatch can produce a dramatically incorrect result.
2. Standard fixed-rate EMI formula
For a fixed periodic interest rate and equal monthly payments, the standard amortising-loan formula is:
P is the principal, r is the monthly interest rate as a decimal, and n is the total number of monthly instalments. If the interest rate is zero, EMI is principal ÷ n. This formula does not automatically include fees, insurance or variable-rate changes.
3. Worked example
Suppose the amount borrowed is ₹1,00,000, the annual nominal interest rate is 12%, and the term is 24 months. The monthly rate is 12 ÷ 12 ÷ 100 = 0.01, and n = 24.
Figures are rounded for illustration. A lender may calculate interest, dates, fees and rounding differently, so treat this as a comparison estimate rather than an offer.
4. How to compare loan scenarios
Compare the EMI alongside total repayment and total interest, not in isolation. A lower monthly payment can come from a longer tenure and may mean paying more interest overall. Also compare processing fees, prepayment conditions, rate resets and penalties.
Read the lender’s Key Facts Statement and loan agreement. Confirm the rate type, payment dates, all fees and whether the rate can change. Avoid borrowing based only on an online estimate.
Frequently asked questions
Does a lower EMI always mean a cheaper loan?
No. A longer term can reduce the monthly instalment while increasing total interest. Compare total repayment and fees as well as the EMI.
Does the formula work for a floating interest rate?
It estimates payments using the rate entered as if it stayed constant. If a lender changes the rate, the payment or remaining tenure may be recalculated.
Are fees included in the EMI estimate?
Not unless the calculator specifically asks for and includes them. Check processing charges, insurance and other costs in the lender’s official documents.
Official reference: Reserve Bank of India website. Use current official guidance for your specific situation.
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