Answered from cited sources · retrieved September 20, 2026
what is compound interest
Compound interest is interest calculated on both your initial principal and the accumulated interest from previous periods.
Compound interest is the interest earned on both the initial principal amount and the interest that has accumulated from previous periods [1][3][5]. Unlike simple interest, which is calculated only on the original deposit, compound interest allows your balance to grow more quickly because you earn interest on your interest [2][4][6]. This process creates a cycle where your earnings are reinvested, potentially leading to exponential growth over time [1][2]. The frequency of compounding—such as daily, monthly, or annually—and the length of time the money is invested significantly impact the total amount earned [1][4][6].
- Growth Multiplier. It allows your money to grow faster than simple interest by paying you interest on your interest, creating a compounding effect over time.
- Compounding Frequency. Interest can be compounded at various intervals, such as daily, monthly, quarterly, or annually; more frequent compounding generally leads to higher returns.
- Mathematical Calculation. The future value of an investment can be calculated using formulas that account for the principal, interest rate, time, and the number of compounding periods.
- Common Applications. It is commonly applied to savings accounts, certificates of deposit (CDs), and money market accounts, as well as certain types of loans.
Sources
- The Power of Compound Interest: Definition, Calculation & Examplesinvestopedia.com · published November 19, 2003
- What Is Compound Interest? | Bankratebankrate.com · published March 31, 2025
- What is compound interest?fidelity.com · published October 9, 2025
- Compound Interest: What It Is & How It Works | Capital Onecapitalone.com · published August 17, 2023
- What is Compound Interest? | Citi.comciti.com · published June 24, 2026
- What is compound interest? | Chasechase.com · published October 31, 2025
- Chapter 5: Compound Interestfdic.gov · published October 25, 2023
- Compound Interestmathsisfun.com
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