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Compound Interest Calculator
Free compound interest calculator. See how your investment grows over time with the power of compounding.
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Compound interest is the most powerful force in finance. See exactly how your money grows when interest earns interest — and why starting early makes such a huge difference.
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FREQUENTLY ASKED QUESTIONS
What is compound interest?
Compound interest means you earn interest on your interest. Unlike simple interest, your returns accelerate over time as your balance grows.
How often does interest compound?
Interest can compound daily, monthly, quarterly, or annually. More frequent compounding means slightly higher returns.
What is the Rule of 72?
Divide 72 by your annual interest rate to estimate how many years it takes to double your money. At 8% return, money doubles in about 9 years.
How much do I need to retire?
A common rule is to save 25x your annual expenses (the 4% rule). If you spend $40,000/year, you need $1,000,000 to retire.