Compound Interest Calculator
Find out how much your savings or investment will grow over time with compound interest. Adjust the principal, interest rate, compounding frequency, and duration to see the final amount and total interest earned.
How to Use
Savings Account Growth
Enter a principal of 10,000, an annual rate of 4.5%, compounded monthly for 5 years to see your savings grow to approximately 12,511.33.
Long-Term Investment
Set 5,000 as the principal at 8% annual interest compounded quarterly over 20 years to discover your investment could reach roughly 24,005.
Compare Compounding Frequencies
Keep the same principal and rate but switch between annual and daily compounding to see how more frequent compounding increases your returns.
How It Works
What Is Compound Interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, compounding accelerates growth because each period's interest is added to the principal for the next calculation.
The Compound Interest Formula
A = P(1 + r/n)^(n*t), where P is the principal, r is the annual interest rate (as a decimal), n is the number of compounding periods per year, and t is time in years. This calculator applies this formula automatically.
Frequently Asked Questions
Related Tools
Percentage Calculator
Calculate percentages instantly: find X% of Y, what percent X is of Y, or the percentage change between two numbers online.
Tip Calculator
Calculate tip amounts and split bills between friends. Choose from preset tip percentages or enter a custom rate, then divide evenly.
VAT Calculator
Add or remove VAT from any amount. Includes Dutch VAT presets (21%, 9%, 6%) and a custom rate option. Instantly see net, VAT, and gross values.