ToolPronto

See how compound interest can grow

Project a balance from principal, monthly contributions, rate, and compounding.

Inputs stay in this tab and are not sent to ToolPronto.

Favorites are saved only in this browser.

Ending balance

Ending balance$59,163.80
Total contributed
$40,000.00
Estimated interest
$19,163.80

Estimate only—excludes taxes, fees, and inflation.

What this tool does

Project a balance from principal, monthly contributions, rate, and compounding. Set the annual rate, duration, and compounding frequency. Compare deposits, interest earned, and final balance.

Common uses

  • Project regular savings.
  • Compare rates or contribution amounts.
  • Visualize long-term compounding.

How to use this tool

  1. Enter the starting balance and monthly contribution.
  2. Set the annual rate, duration, and compounding frequency.
  3. Compare deposits, interest earned, and final balance.