Loan Interest Rate Calculator – Find the Rate from Your EMI
IndiaKnow your loan amount, EMI and tenure but not the rate? This works it out. It also turns a flat-rate quote into the real reducing-balance rate, so you can compare offers on equal terms, and shows the effective rate once a processing fee is counted.
By Ramanathan · RBI disclosure rules last verified: October 8, 2026
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- Checked Against the EMI Formula
Know the rate and want the EMI instead? Use the EMI calculator.
This calculator needs JavaScript to solve for the rate. Here is a worked example; enable JavaScript and reload to use your own figures.
Example
A ₹5,00,000 loan repaid with 60 EMIs of ₹11,122 carries an interest rate of 12% a year on a reducing balance. A 10% flat rate on the same loan over 5 years gives an EMI of ₹12,500, which is really 17.27% a year on a reducing balance.
QUICK REFERENCE
Flat rate to reducing rate
The reducing-balance rate equivalent to common flat rates. The conversion does not depend on the loan amount, only on the flat rate and the term. A 10% flat rate over five years, for example, is really 17.27% a year.
| Flat rate | 1 year | 2 years | 3 years | 5 years | 7 years |
|---|---|---|---|---|---|
| 8% flat | 14.45% | 14.68% | 14.55% | 14.13% | 13.69% |
| 10% flat | 17.97% | 18.16% | 17.92% | 17.27% | 16.66% |
| 12% flat | 21.46% | 21.57% | 21.20% | 20.31% | 19.50% |
| 14% flat | 24.91% | 24.92% | 24.40% | 23.25% | 22.24% |
| 16% flat | 28.33% | 28.22% | 27.53% | 26.10% | 24.88% |
Annual reducing-balance rates, rounded to two decimals. They exclude fees.
HOW IT WORKS
How the interest rate is worked out from an EMI
The EMI formula takes a loan amount, a rate and a tenure and gives you the monthly instalment. Going the other way, from an EMI back to the rate, has no formula you can rearrange: the rate appears in the EMI formula in a way that cannot be isolated. So the calculator searches for it. It finds the rate at which the EMIs, each discounted back to today, add up exactly to the amount you borrowed, narrowing the range a hundred times until the error is far smaller than a rupee.
You can check any answer yourself: put the rate back into an EMI calculator with the same amount and tenure, and you get your EMI back. A ₹5,00,000 loan repaid with 60 EMIs of ₹11,122 comes out at 12% a year. The same idea works for a car loan: ₹8 lakh repaid at ₹16,600 a month over five years is a rate of 8.98%.
Why a flat rate is not what it seems
A flat rate charges interest on the full original loan for the whole term, even though you repay part of it every month. The reducing-balance method, which is how the EMI formula and almost every home loan works, charges interest only on what you still owe. That makes the same number much more expensive as a flat rate. On ₹5 lakh over five years, a 10% flat rate costs ₹2,50,000 in interest with an EMI of ₹12,500. A 10% reducing rate costs ₹1,37,411 with an EMI of ₹10,624. The flat loan costs ₹1,12,589 more for the same headline number, and its real rate is 17.27%. As a rough guide, the real rate is about 1.7 to 1.8 times the flat rate for terms of one to five years.
Some lenders, particularly for vehicle and consumer loans, still advertise a flat rate. Always convert it before comparing it with a reducing-rate offer, and read the flat vs reducing rate guide for the detail.
Processing fees and the effective rate
A processing fee does not change your EMI, but it means you receive less than you repay interest on, so the true cost is higher than the quoted rate. The calculator's effective rate treats the fee as money you never received. On the ₹5 lakh loan at 12%, a 2% fee of ₹10,000 lifts the effective rate to 12.89%.
In India, the Reserve Bank of India's circular on the Key Facts Statement for loans and advances (April 15, 2024) requires lenders to give retail and MSME borrowers a Key Facts Statement with a computation of the Annual Percentage Rate (APR), the annual cost of credit including interest and all other charges, together with the loan's repayment schedule. If your lender's APR is noticeably higher than the rate you calculate here, the difference is charges.
Why your answer may differ slightly from the lender's
EMIs are usually rounded to the nearest rupee, which can move the solved rate in the second decimal place. The first instalment may include extra interest for the days between disbursement and the first EMI date. Some loans fold insurance or other charges into the EMI, which makes the implied rate look higher than the contract rate. And if your rate is floating, a reset changes the EMI or the tenure, so use the figures from your latest statement.
Where to find your numbers
Your sanction letter, Key Facts Statement or loan account statement shows the amount disbursed, the EMI and the number of instalments. For a loan already running, use the outstanding balance and the remaining number of EMIs: the answer is the rate you are paying now.
QUESTIONS & ANSWERS
Loan interest rate — frequently asked questions
You need three numbers: the loan amount, the EMI and the number of monthly instalments. There is no formula that gives the rate directly, so the calculator searches for the rate at which the EMIs, discounted back to today, add up exactly to the loan amount. For example, a ₹5,00,000 loan repaid with 60 EMIs of ₹11,122 works out to 12% a year on a reducing balance. You can check the answer by putting the rate back into an EMI calculator.
A flat rate charges interest on the full original loan for the whole term, even as you repay it. A reducing rate charges interest only on the balance you still owe, which is how the EMI formula and almost every home loan works. The same number therefore costs much more as a flat rate: on ₹5 lakh over five years, 10% flat costs ₹2,50,000 in interest while 10% reducing costs ₹1,37,411.
Choose the flat-rate mode, enter the flat rate and the tenure, and the calculator gives the equivalent reducing-balance rate. The result does not depend on the loan amount. A 10% flat rate over five years equals 17.27% reducing, and over one year 17.97%. As a rough guide, the reducing rate is about 1.7 to 1.8 times the flat rate for terms of one to five years.
EMIs are usually rounded to the nearest rupee, which can shift the result in the second decimal place. The first instalment may also include extra interest for the days between disbursement and the first EMI date, and some loans fold insurance or other charges into the EMI, which makes the implied rate look higher than the contract rate. If the gap is large, ask your lender what the EMI includes.
It is the annual cost of the loan once fees are counted, not just the interest rate. A processing fee means you receive less than the amount you pay interest on, so the effective rate is higher: on ₹5 lakh at 12% over five years, a 2% fee lifts it to 12.89%. In India, the RBI requires lenders to give retail and MSME borrowers a Key Facts Statement that includes the Annual Percentage Rate, covering interest and all other charges.
Yes, for any loan repaid in equal monthly instalments. Enter the amount, EMI and number of months for a home, car, personal or education loan in its repayment phase. For example, ₹8 lakh repaid at ₹16,600 a month over five years is a rate of 8.98% a year. It does not apply to credit cards, which have no fixed EMI, or to interest-only loans.
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FURTHER READING
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