Compound Interest Calculator – Calculate Growth Online Free
See how your investments grow over time with compound interest.
100% free · Instant results · Works in your browser.
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Compounding Frequency:
Principal: $10,000
Total Interest Earned: –
Future Value: –
How to Use Compound Interest Calculator (3 Easy Steps)
- Enter your principal amount, interest rate, and time period
- Choose compounding frequency (Annually is common for many investments)
- Click “Calculate” – see your future value and earned interest instantly
Frequently Asked Questions
Is this calculator free?
Yes – 100% free, unlimited use, no signup required.
What is compound interest?
Compound interest is interest calculated on the initial principal and also on the accumulated interest from previous periods – “interest on interest”.
How often should interest be compounded?
More frequent compounding (e.g., monthly) yields slightly higher returns. Check your investment terms.
Does this include additional contributions?
This calculator assumes a one-time principal with no additional deposits. For regular contributions, use an investment growth calculator.
Is the calculation accurate?
Yes! It uses the standard compound interest formula: A = P × (1 + r/n)^(nt)