Compound Interest Calculator

Estimate compound growth with an initial balance, monthly contributions, time, rate, and compounding frequency.

Initial investment ($)

Monthly contribution ($)

Length of time (years)

Estimated annual interest rate (%)

Compound frequency

Your result

Complete the fields and select Calculate to see the result.

Illustration only. Actual returns can vary and may include taxes, fees, or losses.

A collection of simple, fast tools we design and build ourselves—for calculations, conversions, documents, and everyday tasks.