Calculate compound interest, ROI, retirement planning, and goal-based investing. Professional financial planning tool with detailed breakdowns.
Your investment calculation results
Our free tool delivers fast, accurate results with no signup, no watermarks, and complete privacy — trusted by thousands of users every day.
See the power of compounding — how interest earns interest over time.
Add regular monthly contributions to your investment projection.
Calculate return on investment percentage for any scenario.
Visualise your investment growth on an easy-to-read chart.
No account or email required.
Fully responsive on all platforms.
Enter Investment Details — Input initial amount, annual return rate, time period, and monthly contributions.
Calculate — Click Calculate — results and chart shown instantly.
Review Growth — See your projected total value, contributions, and interest earned.
Understanding when and why to use this tool helps you get the best results for your specific use case.
| Compounding Frequency | Effect |
|---|---|
| Annual | Interest calculated once per year |
| Quarterly | 4× per year — slightly more growth |
| Monthly | 12× per year — commonly used |
| Daily | 365× per year — maximum growth |
| Continuous | Mathematical limit of compounding |
| LynxAI Pro Default | Monthly (most realistic) |
Compound interest is interest calculated on both the principal and the accumulated interest from previous periods. Einstein reportedly called it the eighth wonder of the world — money grows exponentially rather than linearly.
Even small monthly contributions make a significant difference over time due to compounding. Use our calculator to see how different monthly amounts affect your long-term returns.