Personal finance

Compound Interest Calculator

Explore how an initial balance, recurring contributions and compounded returns may build over time. Adjust contribution timing and compounding frequency.

Last reviewed: August 23, 2026 · Free to use · No registration

Interactive tool

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Your estimate

Results

Enter your details and select Calculate to see a clear result breakdown.

Before using the estimate

Important considerations

  • Investment returns are rarely constant or guaranteed.
  • Taxes, fees and inflation can materially reduce real returns.
  • Daily calculations use 365 compounding periods per year.
Common questions

Compound Interest Calculator FAQs

What does compounding frequency mean?

It is how often earned interest is added to the balance so it can earn further returns.

Beginning or end contributions—which is better?

Beginning-of-period contributions receive one extra period of growth, so their projected result is slightly higher.

Are investment fees included?

No. Reduce the expected return if you want to approximate the effect of ongoing fees.