Compound Interest Calculator
Free compound interest calculator. See how your money grows with interest on interest — total amount, interest earned and a year-by-year breakdown for any frequency.
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🔒 Calculated entirely in your browser — nothing is uploaded.
Free Compound Interest Calculator
This free online compound interest calculator shows how much your money grows when interest earns interest. Enter a principal, an annual interest rate, a time period and how often interest compounds, and instantly see the total amount, the interest earned and a year-by-year breakdown. It’s free and runs entirely in your browser.
How to use the compound interest calculator
- Enter the principal — the starting amount.
- Set the annual interest rate.
- Choose the time period in years.
- Pick how often interest compounds (yearly, half-yearly, quarterly, monthly or daily).
- See the total amount, interest earned and the year-by-year growth table.
What is compound interest?
Compound interest is interest calculated on both your original principal and the interest already
added. The formula is A = P × (1 + r/n)n×t, where P is the principal,
r is the annual rate (as a decimal), n is how many times it compounds per year and
t is the number of years. The interest earned is simply A − P.
The magic of compounding is that growth accelerates over time — the longer you leave money invested, the bigger the difference compared with simple interest. More frequent compounding and a higher rate both increase the final amount, but time is usually the most powerful factor, which is why it’s often called the eighth wonder of the world.