Compound Interest Calculator
Calculate compound interest growth on investments and savings. See how your money grows over time. Free, instant, and powerful financial planning.
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How to Calculate Compound Interest
Enter Details
Enter your initial investment, monthly contribution, interest rate, and time period.
View Growth
See your total balance, total contributions, and interest earned.
Adjust Variables
Change any value to see how it affects your long-term growth.
Why Use Our Compound Interest Calculator?
Plan Your Future
See how your savings grow with compound interest over time.
Monthly Contributions
Include regular monthly deposits for realistic projections.
Completely Free
No limits, no signup.
Private & Secure
All calculations happen in your browser.
Frequently Asked Questions
What is compound interest?
Compound interest is interest earned on both your initial principal and the accumulated interest from previous periods. It makes your money grow exponentially over time.
How often is interest compounded?
This calculator compounds monthly, which is common for savings accounts. More frequent compounding (daily vs monthly) results in slightly higher returns.
What is a good annual return rate?
Historical stock market returns average 7-10% annually before inflation. Savings accounts typically offer 0.5-5%. Use conservative estimates for planning.
Is my data sent anywhere?
No. All calculations happen locally in your browser.
Does this account for inflation?
No, this calculator shows nominal returns. To account for inflation, subtract the inflation rate (typically 2-3%) from your expected return rate.