Compound Interest Calculator
Model growth with compounding and monthly contributions, then visualize the balance over time.
Investment results are estimates only. Actual returns depend on market conditions, fees, and timing.
Calculator
Results update as you type
Example
Starting with $5,000.00 at 7% with $250.00 monthly contributions can grow to $53,319.51 over 10 years.
Balance over time
Formula
The math behind the result
How it works
A clean flow from input to answer
- 1Enter the starting balance and annual rate.
- 2Choose how the interest compounds.
- 3Add monthly contributions to project long-term growth.
FAQ
Common questions
Why do contributions matter so much?
Regular contributions often drive the long-term result as much as the interest rate itself.
What is effective annual rate?
It is the real annual growth rate after compounding frequency is taken into account.
Is this a stock market simulator?
No. It is a compounding math calculator, not a market return model.
Can I compare different compounding frequencies?
Yes. Change the frequency and rate to see how the curve shifts.
Does the chart stay responsive?
Yes. The chart scales to the available width so it remains usable on mobile and desktop.