Compound Interest Calculator
Einstein called compounding the eighth wonder. See how your money snowballs with different compounding frequencies.
What Is
Compound interest is interest earned on interest. Each period interest gets added to principal for exponential growth.
How to Use
- Enter initial investment
- Enter annual interest rate
- Choose investment period
- Select compounding frequency
- Optionally add monthly contributions
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Frequently Asked Questions
Simple vs compound?
Simple = interest on principal only. Compound = on principal + accumulated interest.
Frequency impact?
Daily > Monthly > Quarterly > Yearly. More frequent = higher returns.
Rule of 72?
Divide 72 by rate to estimate doubling time.
Compounding against me?
Yes, on loans and credit card debt.
Best investments?
Long-term equity funds, retirement accounts, bonds, and certificates of deposit (CDs) with reinvestment.