Free compound interest tool

Interest Calculator

Estimate future value, total interest, and long-term growth using principal, annual rate, years, and monthly contributions.
Calculator

Estimate future growth

Enter your starting amount, annual rate, years, and monthly contribution to estimate ending balance and total interest earned.

Estimated future value
$44,000
ending balance
Total interest$10,000
Total contributed$34,000
Growth multiple1.29x
Estimated using monthly compounding.
Why it matters

See the power of compounding

Even moderate annual returns can grow significantly over time, especially when recurring monthly contributions are added.

Estimate savings growth
Compare contribution habits
Visualize total interest earned
Simple mobile-friendly tool
How it works

About this calculator

This calculator uses monthly compounding to estimate how your balance may grow over time based on an initial amount, annual interest rate, and recurring monthly contributions.