Every loan — home, car, or personal — is repaid in Equated Monthly Instalments (EMIs): a fixed amount you pay each month until the loan is cleared. The number looks like a black box, but it comes from one clean formula. Once you understand it, you can spot a bad loan instantly.
Just want your number? The free EMI Calculator gives you the monthly payment, total interest, and a full month-by-month schedule in seconds. Read on for how it works.
The EMI formula
EMI = [P × R × (1 + R)N] / [(1 + R)N − 1]
- P = principal (the amount you borrow)
- R = monthly interest rate = annual rate ÷ 12 ÷ 100
- N = number of monthly instalments (tenure in months)
A worked example
Borrow $10,000 at 12% per year for 2 years:
- P = 10,000
- R = 12 ÷ 12 ÷ 100 = 0.01
- N = 24
Plug in and you get an EMI of about $470.73 per month. Over 24 months you pay roughly $11,298 — meaning about $1,298 in interest on top of the $10,000 you borrowed.
Why your early EMIs barely touch the principal
Each EMI is split between interest and principal. Early on, the outstanding balance is large, so most of your payment goes to interest. As the balance shrinks, more of each EMI chips away at principal. This is called amortisation, and it is why paying a little extra in the early years saves disproportionate interest. The EMI Calculator shows this split for every single month.
Three levers that change your EMI
- Tenure: a longer tenure lowers the monthly EMI but raises total interest. Shorter = higher EMI, less interest overall.
- Interest rate: even 1% makes a large difference over long tenures — always compare.
- Prepayment: lump-sum prepayments reduce principal directly and can dramatically cut total interest.
Plan the whole picture
A loan rarely sits alone in your finances. Pair the EMI Calculator with our Compound Interest and SIP tools to compare "pay down debt" against "invest the difference," and use the income tax tools to factor in any interest deductions. They are all free, run in your browser, and need no signup — part of our full set of 49 tools.
