Compound Interest Calculator

Calculate compound interest and see how your investments grow exponentially over time with our free calculator.

Calculate Compound Growth

Initial Principal $10,000

Annual Interest Rate 8%

Time Period 10 Years

Tool Disclaimer: This calculator is for educational purposes only. Projections are based on mathematical formulas and do not guarantee future results. All investments involve risk. We recommend consulting with a certified financial advisor before making significant decisions.

Everything you need to know about Compound Interest Calculator

Compound interest is often referred to as the eighth wonder of the world. It is the simple concept of earning interest on your initial investment, and then earning interest on that interest in subsequent years. This creates an exponential growth curve that can turn small, consistent savings into massive wealth over time.

This Compound Interest Calculator helps you visualize that growth. By inputting your initial principal, expected annual return, and time horizon, you can instantly see how your money multiplies. The longer you leave your money invested, the steeper the growth curve becomes.

The Formula

The standard compound interest formula is A = P(1 + r/n)^(nt), where A is the future value, P is the principal amount, r is the annual interest rate, n is the number of times interest is compounded per year, and t is the time in years. Our calculator simplifies this for annual compounding, allowing you to focus on the long-term impact of your investments.

Frequently Asked Questions

Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal amount AND the accumulated interest of previous periods.

It depends on the account or investment. Savings accounts often compound monthly or daily, while bonds might compound semi-annually. Stock market investments are generally modeled with annual compounding.