Compound Interest (Enhanced)
Calculate compound interest with optional recurring monthly contributions, flexible compounding frequencies, and a full breakdown of interest earned.
Results
What is it?
An enhanced compound interest calculator that factors in recurring monthly contributions alongside an initial principal. It shows how your money grows over time through the power of compounding.
How to use
1. Enter your starting principal. 2. Optionally add a monthly contribution amount. 3. Set your expected annual interest rate. 4. Choose how often interest compounds (daily, monthly, quarterly, or annually). 5. Enter the number of years. The calculator shows the future value, total contributions, and total interest earned.
Example scenario
You invest $10,000 today and add $200 per month at 7% annual interest compounded monthly for 10 years. Your future value is approximately $48,032 — of which $34,000 was contributed and $14,032 is interest.
Pro tip
The difference between monthly and annual compounding grows dramatically over long time horizons. At 7% over 30 years, monthly compounding earns roughly 5% more total interest than annual compounding on the same principal.