How this calculation works
P is the principal, r is the monthly rate (annual percentage rate ÷ 1,200), and n is the number of monthly payments. Each payment covers interest on the remaining balance and reduces the principal.
EMI = P × r ÷ [1 − (1 + r)⁻ⁿ]A worked example
A ₹5,00,000 loan at 12% a year over 5 years has a monthly payment of approximately ₹11,122.22.
Good to know
A planning estimate. Actual products may use different payment dates, fees, tax treatment or rounding. Rates entered here are assumptions, not offers.
The smaller EMI is not always the cheaper loan
Compare a ₹5,00,000 loan at 12% over five years with the same loan over ten years. The longer tenure lowers the estimated monthly payment from about ₹11,122 to ₹7,174. That can help monthly cash flow, but total interest rises from about ₹1.67 lakh to ₹3.61 lakh under this fixed-rate model.
Try both scenarios and compare total interest as well as the monthly amount. A repayment that is comfortable today and a loan that is economical over its full life are related questions, but they are not the same question.
Why your first payments feel interest-heavy
The first month’s interest is calculated on the full starting balance. As you repay principal, future interest is charged on a smaller balance. With the EMI held constant, more of each later payment can go toward the principal. The repayment schedule makes that changing mix visible.
At a nominal annual rate of 12%, the monthly rate in this model is 1%. A ₹5,00,000 opening balance therefore produces ₹5,000 first-month interest. The rest of the estimated EMI reduces the balance; the following month starts from that reduced figure.
A useful proportionality hidden in the formula
Keep the interest rate and tenure unchanged and double the loan amount: the EMI doubles too. Principal enters the formula as a multiplier. By contrast, doubling the rate or doubling the tenure does not produce a simple doubling of the payment, because both affect the compound relationship.
This gives you a quick reasonableness check. If a quoted payment for twice the principal is far from twice as much, investigate whether fees, rates, insurance or repayment timing also changed. A comparison is only fair when its assumptions match.
Read the schedule as an estimate
This schedule uses a fixed rate, payments at the end of each month and unrounded internal balances, then rounds amounts for display. A lender may round individual instalments or use a different accrual convention, so small differences can accumulate.
Processing fees, financed insurance, prepayments, rate resets and missed payments can materially change the real loan. Compare the lender’s official schedule and total payable before making a commitment.
A few questions, answered
Does this include processing fees?
No. It models principal, a constant interest rate and monthly payments. Fees and other charges need to be considered separately.
What happens at a 0% interest rate?
The monthly payment becomes principal divided by the number of months. No interest is added.
Can I use this for a floating-rate loan?
You can explore a fixed-rate scenario, but a floating-rate loan needs recalculation when its rate or repayment terms change.