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Compound Interest Calculator

See how your money grows over time with compound interest, at any compounding frequency.

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Final Amount
0
Interest Earned

How to Use Compound Interest Calculator

  1. Enter your principal (starting) amount.
  2. Enter the annual interest rate and time period in years.
  3. Choose how often interest compounds.
  4. Click Calculate to see your final amount and interest earned.

Features

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Accurate results

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Instant calculation

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100% private

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Mobile friendly

Frequently Asked Questions

Is it free?

Yes.

What formula is used?

A = P(1 + r/n)^(nt), the standard compound interest formula.

Does frequency really matter?

Yes — more frequent compounding (e.g. monthly vs annually) yields slightly more interest over time.

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What is compound interest?
Interest calculated on both the initial principal and the accumulated interest from previous periods — it grows faster than simple interest.
How does compounding frequency affect returns?
More frequent compounding (monthly vs yearly) results in slightly higher returns for the same nominal rate.
Is compound interest good for savings?
Yes, it's the core principle behind long-term investment growth — the earlier you start, the more it compounds.

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