Effective Interest Rate Calculator
Find the effective annual interest rate for a given nominal rate and compounding frequency.
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Your result
8.24%
Effective interest rate
AI explanation
Formula
Effective rate = (1 + nominal rate/n)^n − 1, where n is the number of compounding periods per yearWorked example
8% nominal, compounded quarterly
| Field | Value |
|---|---|
| Nominal annual interest rate | 8 |
| Compounding frequency | 4 |
| Effective interest rate | 8.24 |
Assumptions
- The effective rate is always equal to or greater than the nominal rate.
- Informational only.
Frequently asked questions
Why is the effective rate higher than the nominal rate?
Because interest compounds within the year — each compounding period's interest is added to the balance and starts earning interest itself, so the true annual return exceeds the simple nominal rate.
Where is the effective interest rate used?
Banks and lenders often quote a nominal rate, but the effective rate is what actually applies to your balance over a year — useful for comparing deposits or loans that compound at different frequencies.
Does this apply to loans as well as deposits?
Yes — the same math applies whether you're earning interest on a deposit or being charged interest on a loan; a higher compounding frequency increases the effective rate either way.
Related calculators
Sources
- Master Direction – Reserve Bank of India (Interest Rate on Deposits) — Reserve Bank of India. Effective 03-03-2016, reviewed 13-09-2026.
This calculator provides a general estimate only and does not constitute financial advice.
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