Formula guide

IRA Calculator formula

This calculator compounds the starting amount and adds the future value of monthly contributions to estimate long-term growth.

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 return (%)

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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