The Compound Interest Calculator shows how an investment grows over time when interest is earned on both the original amount and the interest already accumulated. Enter an initial amount, an optional monthly contribution, the interest rate (monthly or yearly) and the period, and the tool instantly projects the final balance, the total you invested and the interest earned, plus a year-by-year breakdown. It is perfect for planning savings, retirement or any long-term goal, and it runs entirely in your browser so your figures stay private.
How to Use the Calculator
- Enter the initial amount and an optional monthly contribution.
- Set the interest rate (per month or per year) and the period.
- Read the final amount, total invested and interest, plus the yearly breakdown.
Benefits and Use Cases
- Plan savings, investments and retirement goals with realistic projections.
- See the impact of regular monthly contributions and of time on compounding.
- Runs entirely in your browser — your financial figures are never uploaded.