What is EMI?
EMI stands for Equated Monthly Instalment — the fixed amount you pay every month to repay a loan over its term. Each EMI payment covers two components: an interest portion (your cost of borrowing) and a principal portion (reducing your outstanding loan balance). In the early months of a loan, most of the EMI goes toward interest. As the balance reduces, the interest portion shrinks and the principal portion grows — this is the amortisation process.
The EMI formula
EMI = P × r × (1+r)^n / ((1+r)^n - 1), where P is the principal (loan amount), r is the monthly interest rate (annual rate ÷ 12 ÷ 100), and n is the number of monthly payments (years × 12). The calculator applies this formula automatically — you never need to touch it manually.
How to use the calculator
Enter the loan amount, annual interest rate, and loan term in years. The calculator instantly shows your monthly EMI, total amount paid over the life of the loan, total interest paid, and the ratio of interest to principal. The amortisation table shows month-by-month how each payment divides between principal and interest and what your remaining balance will be.
The shocking truth about long-term loans
On a 30-year mortgage at 6.5%, for every $250,000 borrowed, you will pay approximately $316,000 in interest alone — more than the original loan. The amortisation schedule makes this visible. Looking at month 1 of a $250,000 30-year loan at 6.5%: of the $1,580 monthly payment, approximately $1,354 goes to interest and only $226 reduces the principal. It takes roughly 16 years of a 30-year mortgage to pay off half the principal.
The impact of extra payments
Making even modest extra principal payments dramatically reduces total interest. On the example above, paying an extra $200 per month reduces a 30-year mortgage to approximately 24 years and saves over $70,000 in interest. The earlier in the loan term you make extra payments, the more dramatic the effect — because every dollar of principal you pay early saves all the interest that would have accrued on that dollar for the remaining loan term.
Comparing loan options
Use the calculator to compare: a lower interest rate vs a shorter term, a 15-year vs 30-year mortgage, a 48-month vs 60-month car loan. The tradeoff is always higher monthly payments vs lower total interest. A 15-year mortgage at 6% might have a payment $400 higher than a 30-year mortgage at 6.5%, but saves over $150,000 in interest over the life of the loan.