How to use Compound Interest Calculator
- Enter your starting amount and monthly contribution.
- Enter the expected yearly interest rate and the number of years.
- Choose how often interest compounds and read the future value.
About this tool
Compound interest earns interest on previous interest, so growth accelerates over time. Contributions are added at the end of each period. The final balance is split into what you paid in and the interest earned.
Actual returns vary and are not guaranteed. Results are estimates for planning and education, not financial advice. Real offers can include fees, rounding and rules that are not modelled here.
Frequently Asked Questions
- How often should interest compound?
- Use the frequency your account states. More frequent compounding gives slightly higher results.
- What is the rule of 72?
- Dividing 72 by the annual rate gives a rough number of years to double your money, for example 72 / 6 = 12 years.
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