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Compound Interest Calculator

⚡ See how your money grows with compound interest. Choose frequency, get step-by-step solutions. 100% free.

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The Best Compound Interest Calculator

Our compound interest calculator is perfect for investment planning and financial education. See exactly how your money grows over time with different compounding frequencies. We show you the complete calculation step-by-step, plus the Rule of 72 to estimate doubling time. No signup, no ads, just instant accurate results.

Compound Interest

A = P(1 + r/n)^(nt)

A = Amount, P = Principal, r = Rate, n = Compounds/year, t = Time

Continuous Compounding

A = Pe^(rt)

For infinite compounding frequency

Examples

$1000 at 5% for 10 years (annually)

1A = 1000(1 + 0.05/1)^(1×10)
2A = 1000(1.05)^10
3A = 1000 × 1.6289 = $1,628.89

$5000 at 8% for 5 years (monthly)

1A = 5000(1 + 0.08/12)^(12×5)
2A = 5000(1.00667)^60
3A = $7,449.23

Frequently Asked Questions

Is this compound interest calculator free?

Yes! 100% free with no signup required and no ads. We believe financial tools should be accessible to everyone.

Why is compound interest so powerful?

Compound interest earns interest on your interest, creating exponential growth. Over long periods, this can dramatically increase your wealth.

What is the Rule of 72?

Divide 72 by your interest rate to estimate years to double your money. At 8%, money doubles in about 9 years.