Compound Interest Calculator

Calculate compound interest with visual chart showing growth over time. Supports various compounding frequencies.

Loading...
1. Enter your initial principal amount (starting investment). 2. Set the annual interest rate as a percentage. 3. Choose the compounding frequency: daily, monthly, quarterly, or annually. 4. Specify the investment duration in years. 5. Optionally add regular monthly contributions to see accelerated growth. 6. View the growth chart and final balance with total interest earned.

About This Tool

The compound interest calculator helps you understand how your money grows over time when interest is earned on both the initial principal and previously accumulated interest. This powerful financial tool visualizes your investment growth with an interactive chart, making it easy to see how different rates, time periods, and compounding frequencies affect your returns.

Whether you are planning for retirement, comparing savings accounts, or evaluating investment options, this calculator provides a clear picture of your potential earnings. Adjust the principal amount, annual interest rate, compounding frequency, and investment duration to explore different scenarios. The chart visualization highlights the dramatic difference between simple and compound interest over long time horizons.

Understanding compound interest is essential for making informed financial decisions. Albert Einstein reportedly called it the eighth wonder of the world - those who understand it earn it, and those who do not pay it. Use this calculator to put the power of compounding to work in your financial planning.

Formula / How It Works

A = P(1 + r/n)^(nt), where A = final amount, P = principal, r = annual interest rate, n = compounding frequency per year, t = time in years

Frequently Asked Questions

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, which only earns interest on the original amount, compound interest allows your money to grow exponentially over time as you earn interest on your interest.
The more frequently interest is compounded, the higher the effective return. Daily compounding yields slightly more than monthly, which yields more than quarterly or annually. However, the difference between daily and monthly compounding is often minimal for most savings accounts and investments.
APR (Annual Percentage Rate) is the stated annual interest rate without accounting for compounding. APY (Annual Percentage Yield) includes the effect of compounding and represents the actual return you earn in a year. APY is always equal to or higher than APR when interest compounds more than once per year.
The Rule of 72 is a quick way to estimate how long it takes for an investment to double. Divide 72 by the annual interest rate to get the approximate number of years. For example, at 6% interest, your money doubles in roughly 12 years (72 / 6 = 12).
Yes, this calculator supports regular contributions (monthly or annual). Adding consistent contributions dramatically accelerates growth because each new deposit also begins earning compound interest, creating a snowball effect over time.

Related Tools

Simple Interest Calculator

Calculate simple interest on a principal amount with a fixed rate and time period. Quick and straightforward.

Finance and Business

ROI Calculator

Calculate return on investment with percentage gain or loss, annualized ROI, and total profit for any investment.

Finance and Business

Retirement Savings Calculator

Project retirement fund growth with monthly contributions, employer match, and compound interest chart.

Finance and Business

Mortgage Calculator

Calculate monthly mortgage payments, total interest, and view amortization for home loans with taxes and insurance.

Finance and Business

Inflation Calculator

Calculate purchasing power change over time using historical CPI data. Year-over-year comparison.

Finance and Business

Loan and EMI Calculator

Calculate monthly loan payments (EMI) and view a full amortization schedule with principal and interest breakdown.

Finance and Business