Compound Interest Calculator
Finance ToolsCalculate how compound interest grows your money. Visualize exponential growth over time.
How to use Compound Interest Calculator
- 1Enter your input in the text area above
- 2Click the action button to process your data
- 3View the result and copy it to your clipboard
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Process your data quickly and efficiently.
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This tool is completely free with no signup.
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Works on any device with a browser.
Frequently Asked Questions
What is compound interest?
Compound interest is 'interest on interest' - your earnings generate their own earnings. Formula: A = P(1+r/n)^(nt), where P=principal, r=rate, n=compounding frequency, t=years. Albert Einstein reportedly called it 'the eighth wonder of the world'.
How does compounding frequency affect growth?
More frequent compounding = faster growth. $10,000 at 5% for 10 years: annually = $16,289, monthly = $16,470, daily = $16,487. The difference is small at low rates but significant at higher rates or longer periods.
What's the Rule of 72?
The Rule of 72 estimates how long it takes to double your money: Years to double = 72 / interest rate. At 6% return: 72/6 = 12 years. At 10%: 7.2 years. This is a quick mental math trick for investment planning.
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