Compound Interest Calculator
Calculate compound interest on an investment.
Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods, causing your investment to grow exponentially over time.
How do I use the compound interest calculator?
Enter your principal amount, annual interest rate, compounding frequency (monthly, quarterly, annually), and the duration in years. The tool calculates the final amount and total interest earned.
How does compounding frequency affect returns?
More frequent compounding yields higher returns. Monthly compounding earns more than annual compounding because interest is added to the principal more often, generating interest on interest sooner.
What is the difference between simple and compound interest?
Simple interest is calculated only on the principal amount, while compound interest includes accumulated interest. Over long periods, compound interest grows significantly faster than simple interest.
Is this tool free?
Yes, ToolDock's compound interest calculator is completely free, requires no signup, and runs entirely in your browser.