Formula guide

Compound Interest Calculator formula

This calculator uses the future value of compound growth plus the future value of a monthly contribution stream. In simple terms, it compounds your initial deposit over the selected number of years and then adds the growth from each monthly contribution. The result helps you see the combined power of time, return, and consistency.

How the input values are used

Initial deposit

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

Monthly contribution

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

Annual interest 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 Initial deposit and Monthly contribution. 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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