Investment Growth Visualiser Tool

Use this free investment growth calculator to explore how an initial investment and regular monthly contributions could grow over time. Enter your starting amount, monthly contribution, assumed annual return and number of years to see a projected balance, total contributions and illustrative growth. No sign-up is required.

Jump to the investment growth calculator, or read the instructions below.

The calculator uses a constant annual rate divided by 12, applies growth monthly and adds contributions at each month’s end. It does not account for fees, tax, inflation or changing market returns. Results are illustrations, not forecasts or guaranteed returns.

1. Enter Your Initial Investment

• What it is: A one-time lump sum you already have (or plan to put aside) at the very start.
• How to use: Click the “Initial Investment ($)” field and type in the amount (e.g., 1000).
• Tip: If you’re starting from zero, simply enter 0. You can still see how monthly contributions alone can build wealth over time.

2. Specify Your Monthly Contribution

• What it is: The fixed amount you plan to add at the end of each month.
• How to use: Click “Monthly Contribution ($)” and enter a value (e.g., 200).
• Why it matters: Regular, even small, monthly deposits can significantly boost your final balance thanks to compounding interest.

3. Set Your Expected Annual Return (%)

• What it is: The annual percentage rate you anticipate (based on historical averages or your own conservative estimate).
• How to use: Click “Expected Annual Return (%)” and type in a number (e.g., 7 for 7 %).
• Note: This field expects a percentage (don’t type the “%” sign). Try different assumptions to compare scenarios; the calculator does not predict what your investments will return.

4. Choose the Number of Years to Invest

• What it is: How many years you plan to leave your money invested.
• How to use: Click “Years to Invest” and enter a whole number (e.g., 20).
• Why it matters: Time is a powerful force. The longer you stay invested, the more dramatic the compounding effect.

5. Click “Simulate Growth”

• What happens:
  1. The tool converts your annual return to a monthly rate.
  2. It runs a month-by-month calculation: each month’s balance grows by the interest rate, then adds your contribution.
  3. At the end of each 12-month cycle, the simulator records the balance for that year.
• Result: Within seconds, a line chart appears showing “Projected Balance ($)” at the end of each year. You’ll also see a brief text summary below the chart.

6. Read Your Results (All for Free)

Below the chart, you’ll find three key figures:

1. Final Balance (after your chosen number of years)
2. Total Contributions (initial investment + sum of all monthly deposits)
3. Total Interest Earned (the “extra” money generated by compounding)

All of this data is calculated instantly—and remains 100 % free. There are no hidden fees, no trials, and no subscription required.