Compound Interest Calculator
Calculate the future value of an investment or loan with compound interest. Enter principal, rate, time, and compounding frequency.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Compound Interest Calculator
- Enter the Principal Amount – The initial sum of money (e.g., $1,000). Must be a positive number.
- Enter the Annual Interest Rate – As a percentage (e.g., 5 for 5%). Must be between 0 and 100.
- Enter the Time Period – In years (e.g., 10). Can include decimals (e.g., 2.5 years).
- Select Compounding Frequency – Choose how often interest is applied: Annually, Semi-Annually, Quarterly, Monthly (default), or Daily.
- Click "Calculate" – The result shows the Future Value (total amount after interest) and the Total Interest Earned.
Note: All monetary values are displayed in USD ($). Ensure all inputs are positive numbers; invalid entries will show red error indicators.
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Frequently Asked Questions
Compound interest is interest calculated on the initial principal and also on the accumulated interest of previous periods.
More frequent compounding (e.g., daily vs. annually) results in higher future value because interest is added more often.
Yes, the formula works for both investments and loans, but for loans it represents the amount owed if interest compounds.
