ToolCubbyCompound Interest Calculator
See how an investment or loan grows with compound interest over time using the formula A = P(1 + r/n)nt.
How to use
- Enter the principal amount you start with.
- Set the annual interest rate and how often it compounds.
- Enter the number of years, then click Calculate to see the future value and total interest earned.
FAQ
What is compound interest?
Interest earned on both the original principal and previously accumulated interest — money grows faster over time than simple interest.
How is it calculated?
A = P(1 + r/n)^(nt). For $1,000 at 5% monthly for 10 years: 1000 × (1 + 0.05/12)^120.
What is total interest?
The final amount minus the original principal — the extra money you earned.
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More FAQs
Is this calculator free?
Yes, it is completely free with no signup and no limits.
Does it run in my browser?
Yes. Everything is calculated locally on your device — nothing is uploaded.
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