Formula guide

Investment Calculator formula

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 the input values are used

Starting amount (USD)

The numeric value in USD is used in the calculation; keep units consistent.

Monthly contribution (USD)

The numeric value in USD is used in the calculation; keep units consistent.

Annual growth rate (%)

The numeric value in % is used in the calculation; keep units consistent.

Years

The numeric value is used in the calculation; keep units consistent.

How to interpret the result

  • The result uses Starting amount (USD) and Monthly contribution (USD). Change one variable at a time to compare its effect on the outcome.
  • Check whether relevant fees, taxes, and timing assumptions are included before using the estimate.
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