How we calculate
Every calculator on this site is a small, tested function. We publish the formula, the assumptions and the known limitations for each one, and link to the primary sources we rely on.
- We compute in full precision and round only when showing you the result.
- APR follows the internal-rate-of-return method illustrated in RBI's Key Facts Statement circular (April 2024).
- Each calculator has automated tests, including RBI's own worked APR example.
- Your inputs never leave your browser.
- Loan True Cost & APR Checker
How we calculate a loan's APR from the interest rate, tenure, processing fee, GST and other charges, using the IRR method shown in RBI's KFS circular.
- Loan Prepayment Calculator
How we simulate a lump-sum or monthly part-prepayment month by month, compare reducing the tenure with reducing the EMI, and net off prepayment charges.
- Balance Transfer Calculator
How we compare staying with your current lender against switching, including all switching costs, net saving and the month the switch pays for itself.
- EMI Calculator
The standard reducing-balance EMI formula we use, how the repayment schedule is built, and how rounding is handled so principal adds up exactly.
- Credit Card & No-Cost EMI Calculator
How we calculate the true extra cost of standard and no-cost credit card EMIs, including GST on interest and processing fees, and an effective APR.
- Loan Affordability Calculator
How we estimate a safe EMI from your take-home pay, commitments and expenses using an illustrative FOIR limit, and the loan amount that EMI supports.