How home loan EMI is calculated
EMI (Equated Monthly Instalment) is the fixed amount you pay your lender each month, covering both interest and principal. It is calculated with the standard formula EMI = P × r × (1+r)n ÷ ((1+r)n − 1), where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12 ÷ 100) and n is the number of monthly instalments. For a ₹30 lakh loan at 8.5% over 20 years, the EMI works out to about ₹26,035, with total interest of roughly ₹32.5 lakh over the full term.
Why early EMIs are mostly interest
In the early years, most of each EMI goes toward interest and only a small part reduces the principal — which is why the year-by-year schedule above shows the balance falling slowly at first and faster later. Making prepayments early in the tenure therefore saves disproportionately more interest than the same prepayment made near the end.
Planning a construction loan
Construction loans are often disbursed in stages tied to build progress, and interest may be charged only on the amount drawn. Use this EMI figure for budgeting your repayment capacity, and pair it with the house construction cost calculator to size the loan against your build budget. Lenders typically expect the EMI to stay within about 40–50% of your monthly income.