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Interest Rate Calculator
Solve for interest rate given principal, payment, and term.
Enter values to see your result
Frequently asked questions
When is this useful?
Evaluating "no-interest" EMI offers. E.g. ₹50K item at ₹5K × 12 months = effective 0% only if you'd pay ₹50K cash upfront, else it's hidden rate.
What about compounding frequency?
This uses monthly compounding (standard for loans). For annual compound, divide by 1 not 12.
Can rate be negative?
Mathematically yes — if final value is LESS than principal with positive cash flows. In practice, this indicates a losing investment.
Rule of 72 relation?
Time to double at rate r = 72/r. Inverted: if something doubles in 10 years, rate ≈ 7.2%. Quick mental math check.