Find a loan's interest rate from the amount, payment and term.
A ₹10,00,000 loan repaid with ₹20,758.36 a month for 5 years has an interest rate of 9% per year.
Sometimes you know what you borrowed and what you pay each month but not the rate. This calculator works backwards from the loan amount, the monthly payment and the term to find the annual interest rate, and shows the effective annual rate and the total interest paid.
The tool is useful for checking a lender's quoted rate, comparing offers and spotting hidden costs. If fees are involved, the true cost is higher — use the APR Calculator. To go the other way and find the payment, use the Payment Calculator.
The calculator applies the standard financial formulas step by step.
| Item | Value |
|---|---|
| Loan amount | ₹10,00,000.00 |
| Monthly payment | ₹20,758.36 |
| Number of payments | 60 |
| Total paid | ₹12,45,501.60 |
| Total interest | ₹2,45,501.60 |
| Nominal annual rate | 9% |
| Effective annual rate | 9.381% |
| Case | Interest rate |
|---|---|
| ₹10,00,000, 5 years, ₹20,758/month | 9% |
| ₹10,00,000, 5 years, ₹22,244/month | 11.999% |
| ₹10,00,000, 5 years, ₹24,000/month | 15.399% |
| ₹10,00,000, 3 years, ₹33,000/month | 11.55% |
| ₹10,00,000, 10 years, ₹14,000/month | 11.396% |
Enter the amount, payment and term; the calculator solves the payment formula for the rate.
The payment formula can't be rearranged for r, so the rate is found by repeated approximation.
That would imply a negative rate, so the calculator warns you to check the numbers.
The true yearly cost after monthly compounding; it is slightly higher than the nominal rate.
No. If fees apply, use the APR Calculator for the all-in cost.
Yes, any fixed-rate loan with equal monthly payments.
It uses the standard formula: Solve for r in: payment = P × r ÷ (1 − (1 + r)^−n) The full method and a worked example are shown on this page.
No. The calculator gives estimates for planning and learning. Real offers vary by lender, product and date, so confirm the details with your bank, lender or a qualified adviser before deciding.
Yes. The maths is identical in any currency; only the currency symbol shown in the results differs.
No. Everything is calculated in your browser and nothing you enter is uploaded or saved.
