Investment Calculator
The Investment Calculator is a free online compound interest tool. Enter your initial amount, expected annual return, and investment horizon to see the final value, total invested, total return, and overall return rate. It also supports monthly contributions and lets you choose monthly, quarterly, or annual compounding to visualize the long-term power of compounding and dollar-cost averaging.
All calculations happen locally in your browser — no financial figures are uploaded anywhere. It is free with no registration, useful for planning recurring fund investments, savings goals, or retirement projections, and for teaching how compound growth works.
How to Use
- Enter your initial investment and expected annual return (%).
- Set the investment period in years, and optionally a monthly contribution.
- Choose the compounding frequency: monthly, quarterly, or annually.
- Click the Calculate button.
- Review the final value, total invested, total return, and return rate.
FAQ
Is the investment calculator free?
Yes, completely free — no registration and no limits on how often you use it.
How does the calculation work?
It uses the standard compound interest formula: final value = principal x (1 + periodic rate) ^ number of periods, based on your chosen compounding frequency. Each monthly contribution is compounded separately over its remaining time, which is why starting earlier and contributing consistently makes such a large difference.
What annual return should I enter?
Use long-term historical averages for your asset type as a starting point: roughly 2-3% for money market funds, 3-5% for bond funds, and 6-10% for broad stock index funds. Past performance does not guarantee future results, so try conservative, moderate, and optimistic scenarios and compare them.
Can I treat the results as investment advice?
No. The tool assumes a constant return, while real markets fluctuate and can lose money. Results are estimates for planning and education only, not investment advice. Assess your own risk tolerance and consider consulting a licensed financial advisor before making decisions.