Investment Growth Calculator
This investment calculator estimates how your money can grow over time using compound returns and regular contributions. Enter an initial investment, the number of years you plan to stay invested, an expected annual return, and any monthly contributions. The calculator projects a final balance and breaks down total contributions versus interest earned.
Why compounding matters
Compounding is the process where investment returns generate their own returns. The longer you stay invested, the more powerful compounding becomes — small, consistent contributions can grow substantially over decades. This tool provides a simple, conservative projection to help you set expectations and plan savings goals.
How to use the calculator
- Initial investment: The starting principal you plan to invest today.
- Years of growth: How long you will leave the money invested.
- Expected annual return: A long-term average return assumption — for diversified portfolios, 5–7% is common; use a conservative number for planning.
- Monthly contribution: Amount you plan to add each month; recurring contributions increase the final result due to compounding.
Interpreting results
Results show the projected final balance, the total you contributed (principal plus recurring contributions), and the interest earned — the portion of growth attributable to returns. These are hypothetical projections and do not account for fees, taxes, or market volatility.
Practical tips
- Run scenarios with different return assumptions to see a range of outcomes.
- Prioritize low-cost, diversified funds to improve net returns after fees.
- Factor in taxes and account types (tax-advantaged vs. taxable) when creating a savings plan.
Use this projection as a planning aid — regular investing and time in the market are the most reliable drivers of long-term wealth building.