Finance calculator

Investment Calculator

Free Investment calculator. Project investment growth from an initial amount, monthly contributions, return rate, and time. Use our free online calculator.

Last updated August 24, 2026

Finance calculator

Investment Calculator

Project investment growth from an initial amount, monthly contributions, return rate, and time.

How this calculator works

This calculator estimates future investment value with monthly contributions and compound growth. Enter the initial investment, monthly contribution, annual return rate, and time in years to see the projected future value. Use it for long-term savings planning, comparing investment assumptions, and understanding how compound interest builds wealth over time. The key inputs are initial investment, monthly contribution, annual return rate, and investment years. The output is the future value, total contributions, and total interest earned. Real-world applications include retirement savings, investment portfolio planning, education fund planning, and financial goal setting. The calculator applies monthly compounding to the initial investment and monthly contributions using the annual return converted to a monthly rate. It does not include taxes, advisory fees, fund expenses, or trading costs. Actual investment returns can vary year to year, so treat this as a scenario estimate.

Methodology

The calculator applies monthly compounding to the initial investment and monthly contributions using the annual return converted to a monthly rate.

Examples

  • Estimate future value from an initial investment.
  • See how monthly contributions compound over time.
  • Compare different annual return assumptions.

Common questions

Does this include taxes or fees?

No. Taxes, advisory fees, fund expenses, and trading costs can reduce real returns.

Why do contributions matter so much?

Regular contributions add new principal that can also grow. Over long periods, contribution consistency often matters as much as the return rate.

Is the return rate guaranteed?

No. The return is an assumption. Actual investment returns can vary year to year.