Formula guide

Retirement Calculator formula

The calculator compounds your current retirement balance over time, adds recurring annual or monthly contributions, and estimates the future portfolio value at retirement age. It is intended for goal planning rather than a full retirement income plan.

How the input values are used

Current age

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

Retirement age

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

Current savings (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.

How to interpret the result

  • The result uses Current age and Retirement age. 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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