Interest Rate Calculator
Find the annual interest rate from a principal, final amount and time.
Annual interest rate (nominal)
8.45%
The nominal rate is the yearly rate before compounding is applied within the year, while the effective rate reflects the actual yearly growth after compounding. They match when compounding is annual.
About the Interest Rate Calculator
The Interest Rate Calculator works out the annual interest rate needed to grow a principal into a target final amount over a given time.
It reports the nominal annual rate, which is the yearly rate before compounding within the year, and the effective annual rate, which reflects the real yearly growth once compounding is applied.
Choose how often interest compounds to match your scenario. The two rates are equal when compounding is annual, and all calculations run in your browser.
Key features
- Nominal and effective annual rate
- Annual to daily compounding
- Time in years or months
- Instant browser-based calculation
How to use
- 1Enter the principal and the final amount.
- 2Enter the time and choose years or months.
- 3Choose how often interest compounds.
- 4Read the nominal and effective annual rate.
Frequently asked questions
- What is the difference between nominal and effective rate?
- The nominal rate is the stated yearly rate before intra-year compounding. The effective rate reflects the actual growth over a year once compounding is included.
- When are the two rates the same?
- They are equal when interest compounds once per year.
- Can the rate be negative?
- If the final amount is less than the principal, the implied rate would be negative, which represents a loss rather than growth.