Interest Calculator (Simple & Compound)
simple + compound interest
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Total interest earned
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Final value
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Rate used
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Total cost
Interest snapshot
Enter the starting amount, annual rate and time period to see both simple and compound interest side by side.
Related tools
Simple vs compound interest
- Simple: Interest = P × r × t, where r is the yearly rate and t is years.
- Compound: A = P × (1 + r/n)^(nt) — interest earns interest itself, accelerating growth.
- Rule of 72: divide 72 by the rate to estimate years to double your money.
Estimate only: Estimate only — actual returns depend on the product and compounding frequency.