Compound Interest Calculator

See how your savings and investments grow over time with compound interest, monthly contributions and any compounding frequency. 100% free and private.

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🔒 Private by design

All calculations run locally in your browser. Nothing is uploaded to any server.

💰 Monthly contributions

Model regular savings plans to see the real power of dollar-cost averaging.

📈 Visual growth chart

An interactive chart shows your balance and interest growing year by year.

🎯 Flexible frequency

Compound daily, monthly, quarterly, semi-annually or annually to match your account.

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