The True Cost of a Loan
When you compare loans, the EMI tells you what you pay each month — but the total interest tells you what the loan really costs. Two loans with similar EMIs can differ by lakhs of rupees in interest because of the rate or the tenure.
How Loan Interest is Calculated
Banks charge interest on the reducing balance: each month’s interest is the outstanding balance × the monthly rate, and the rest of the EMI repays principal.
Worked example
₹10,00,000 at 10% for 5 years: the EMI is ₹21,247, the total repaid is ₹12,74,823 and the total interest is ₹2,74,823.
What Changes the Interest
| ₹10 lakh loan | EMI | Total interest |
|---|---|---|
| 10% for 5 years | ₹21,247 | ₹2,74,823 |
| 10% for 7 years | ₹16,601 | ₹3,94,499 |
| 12% for 5 years | ₹22,244 | ₹3,34,667 |
A longer tenure lowers the EMI but raises the total interest; a higher rate raises both. On a ₹30 lakh loan at 9%, moving from 15 to 20 years cuts the EMI from ₹30,428 to ₹26,992 but adds over ₹10 lakh of interest (₹24,77,040 vs ₹34,78,027).
Ways to Pay Less Interest
- Choose the shortest tenure whose EMI fits comfortably in your budget.
- Negotiate the rate or move to a cheaper lender (balance transfer), net of fees.
- Make part payments early in the loan — see the loan prepayment calculator.
Frequently Asked Questions
How is the total interest on a loan calculated?
Total interest = (EMI × number of instalments) − loan amount. For ₹10 lakh at 10% for 5 years, the EMI is ₹21,247, so you repay about ₹12,74,823 in total and ₹2,74,823 of that is interest.
Does a longer tenure always cost more interest?
Yes, at the same rate. A longer tenure lowers the EMI but the balance is outstanding for longer, so total interest rises. Stretching the same ₹10 lakh at 10% from 5 to 7 years cuts the EMI to ₹16,601 but raises interest to ₹3,94,499.
What is the difference between flat and reducing-balance interest?
A flat rate charges interest on the original amount for the whole tenure. A reducing-balance rate charges interest only on what you still owe, which is how this calculator works. A flat rate costs much more than a reducing rate with the same number.
Is the EMI calculated by this tool the same as my bank’s EMI?
It uses the standard monthly reducing-balance formula that most Indian banks and NBFCs use, so it should be very close. Your lender’s exact figure can differ slightly because of rounding, the date your first EMI falls on (broken-period interest), processing fees, insurance or a different interest-calculation method. Always confirm with your loan sanction letter.
Does the calculator store my numbers?
No. All calculations run inside your browser. The amounts you enter are not sent to our server or saved anywhere.