How to Calculate EMI: Formula, Examples, and Tips
EMI, or Equated Monthly Installment, is the fixed payment you make to repay a loan. Knowing how it is calculated helps you compare offers and avoid borrowing more than you can comfortably repay. This guide breaks down the formula with a real example.
Updated June 27, 2026
The EMI formula
EMI is calculated with the reducing-balance formula: EMI = P x r x (1 + r)^n / ((1 + r)^n - 1). Here P is the principal (the amount borrowed), r is the monthly interest rate (the annual rate divided by 12, expressed as a decimal), and n is the number of monthly installments.
The key idea is that interest is charged on the outstanding balance, which shrinks every month as you repay principal. Early payments are mostly interest; later payments are mostly principal.
A worked example
Suppose you borrow 500,000 at 10% annual interest for 5 years. The monthly rate r is 0.10 / 12 = 0.00833, and n is 60 months. Plugging these into the formula gives an EMI of about 10,624 per month.
Over 60 months you would pay roughly 637,000 in total, meaning about 137,000 is interest. Seeing the total interest, not just the monthly figure, is what reveals the true cost of a loan.
How to reduce your total interest
Three levers reduce total interest: a lower interest rate, a shorter tenure, and prepayments. A shorter tenure raises the monthly EMI but cuts total interest significantly because the balance is outstanding for less time.
Prepaying even a small amount early in the loan has an outsized effect, since it reduces the principal that interest is charged on for the entire remaining term. Use an EMI calculator to test each scenario before committing.
Tools mentioned in this guide
- EMI CalculatorCalculate loan EMI, total interest, and payment breakdown for any principal, rate, and tenure.
- Loan CalculatorCalculate monthly loan payments, total interest, and a full amortization schedule for any loan.
- Mortgage CalculatorEstimate monthly mortgage payments including principal, interest, taxes, insurance, PMI, and HOA.
Frequently asked questions
- Does a longer loan tenure reduce the EMI?
- Yes, a longer tenure lowers the monthly EMI, but it increases the total interest you pay because you are borrowing for longer.
- Is EMI calculated on reducing balance or flat rate?
- Most modern loans use the reducing-balance method, where interest is charged on the outstanding balance. Flat-rate loans charge interest on the full principal throughout and are usually more expensive.