MarketPathAcademy

Compound interest

See how money grows when interest earns interest, with optional monthly additions.

What you enter

  • Starting amount
  • Monthly addition
  • Annual interest rate
  • Years
  • Compounding

How this is calculated

  • Monthly growth rate = (1 + annual rate ÷ compounding periods)^(periods ÷ 12) − 1.
  • Each month: balance = balance × (1 + monthly rate) + monthly addition (added at month end).
  • Effective annual rate = (1 + rate ÷ periods)^periods − 1.

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These calculators show illustrative outcomes only. Returns are not guaranteed. Tax rules and rates change; verify them before acting. Nothing here is financial, tax or legal advice.