Free online tool

Compound Interest Calculator

See how principal, contributions, time, and compounding combine into a future balance.

Projection runs in your browser

Use Compound Interest Calculator

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What this tool does

Project compound growth with recurring contributions and flexible compounding periods.

Method

The engine compounds each period at the selected frequency and applies contributions at the configured beginning or end of each contribution interval.

Example

Project $10,000 growing at 7% for 20 years with a $250 monthly contribution.

Inputs and outputs

You provideYou receive
  • Initial principal
  • Contribution and frequency
  • Annual rate
  • Duration
  • Compounding frequency
  • Contribution timing
  • Optional inflation and tax
  • Ending balance
  • Total contributions
  • Total interest
  • Yearly table
  • Growth chart
  • Effective annual yield

Privacy and data use

Projection runs in your browser. Investment assumptions are not uploaded or associated with an identity.

Read the full privacy policy.

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Common questions

Is it free?

Yes. The core tool and its standard result or export are free to use.

Do I need an account?

No for the core utility. An account or private management token is requested only for capabilities that must persist, such as editable dynamic QR links.

Can I trust the result?

The method and assumptions are visible above. Time-sensitive tools name their sources and freshness; important financial, safety, legal, or operational decisions should be verified with the primary authority.