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Investment Calculator

Free investment calculator for future value with recurring contributions. Estimate portfolio growth, total invested amount, and projected ending balance over time.

Instant result
Projected value
$109,333.42
Total contributed$59,000.00
Estimated growth$50,333.42
Average monthly addition$300.00

Calculator results are provided for planning and educational purposes. For taxes, legal decisions, lending, or medical advice, verify the numbers with an official source or qualified professional.

About this calculator

The investment calculator is built for long-term planning. You can use it to model a brokerage account, IRA, taxable investment account, or a simple market-return scenario with an initial investment plus monthly deposits.

How this calculator works

This calculator estimates future value by compounding your starting balance and adding the projected growth of monthly contributions. It is most useful for scenario planning when you want to compare conservative, moderate, and aggressive return assumptions.

How to use it

  1. Enter your starting investment amount.
  2. Add the amount you plan to invest each month.
  3. Choose an annual return assumption and time horizon.
  4. Compare different return rates or contribution amounts to see how your ending balance changes.

Example

If you invest $20,000 today and contribute $400 each month for 15 years, the calculator can show how strongly the ending balance changes when you test 6%, 8%, or 10% annual returns.

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More ways to explore this calculator

Mega Calculators builds a content cluster around each high-value tool so users can open the live calculator, read the formula, follow a guide, or jump into example pages that match specific search intent.

Frequently asked questions

Is this different from a compound interest calculator?

They are very similar. An investment calculator is usually framed around market growth and recurring investing, while compound interest tools are often used for general savings or account growth.

Should I enter an average stock market return?

You can, but it is best to test several scenarios. Long-term returns vary, and future performance is never guaranteed.

Does this include taxes and fees?

No. This version is intended for quick forecasting. Taxes, fund expenses, and trading costs can reduce real returns.

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