Compound Interest Calculator
? Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and accumulated interest from previous periods. It's "interest on interest," which makes investments grow faster than simple interest.
What's the difference between compound frequencies?
Interest can compound annually, semi-annually, quarterly, monthly, or daily. More frequent compounding means faster growth. For example, monthly compounding earns more than annual compounding at the same rate.
How do additional contributions affect growth?
Regular contributions (like monthly deposits) dramatically increase the final amount due to compound interest working on each contribution. The calculator shows how consistent saving accelerates wealth building.
What's the compound interest formula?
The formula is A = P(1 + r/n)^(nt), where A is final amount, P is principal, r is annual rate, n is compounds per year, and t is time in years. With contributions, each is calculated separately.
How accurate is the calculator for real investments?
The calculator assumes a fixed interest rate, which is ideal for CDs or bonds. Real investments like stocks have variable returns, so use historical average rates for estimates, not predictions.
Is my data safe and secure?
Yes, absolutely! This tool runs entirely in your browser. All data processing happens locally on your device - nothing is uploaded to our servers. Your files and data never leave your computer, ensuring complete privacy and security.