Simple & Compound Interest
10 toolsCalculate simple or compound interest.
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Calculate simple or compound interest from a principal, rate and time. Simple interest is calculated only on the original amount, while compound interest also earns interest on past interest, so it grows faster over time. Results are estimates.
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Interest earned
2,400
Total amount
12,400
How to use this tool
- 1Choose Simple or Compound.
- 2Enter principal, rate, and time.
- 3See interest earned and total update instantly.
Frequently asked questions
What's the difference?
Simple: I = P × r × t ÷ 100. Compound (annual): Total = P × (1 + r/100)ᵗ.
Is my data uploaded anywhere?
No — computed entirely in your browser.