Compound Interest Calculator
Estimate compound growth from a starting balance, interest rate, time, compounding frequency, and monthly contributions.
About this tool
What is Compound Interest Calculator?
Estimate how a starting balance may grow with compound interest over time. Enter the principal, annual rate, number of years, compounding frequency, and optional monthly contribution to compare the estimated ending balance, total contributions, and interest earned.
How to use
Get your result in a few steps
- 1
Enter the starting principal.
- 2
Enter the annual interest rate and number of years.
- 3
Set the number of compounding periods per year.
- 4
Optionally add a monthly contribution, then calculate the estimated future value.
Frequently asked questions
Questions about Compound Interest Calculator
What does compounding frequency mean?
Compounding frequency is how often interest is applied to the starting principal in the calculator, such as monthly, quarterly, or annually.
How are monthly contributions handled?
Monthly contributions are accumulated using a monthly rate so the calculator can estimate their future value alongside the starting balance.
Does the result guarantee an investment return?
No. The result is a mathematical projection based on a constant rate and does not predict actual market or account performance.
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