F*kit Compound Interest Calculator
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F*kit Compound Interest Calculator

See how your money can grow—no fluff, just facts.

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Your Inputs

Money you’re starting with today.

Use negative to simulate withdrawals.

We’ll show outcomes at (rate − variance), base rate, and (rate + variance).

Times per year interest is compounded.

Review My Results

Quick presets

Pro tips

  • Use realistic long-term rates (6–8% for stocks, before fees).
  • Try increasing contributions yearly (cost-of-living raises).
  • Employer match? Add it as an extra contribution — and share your summary with HR.
  • Variance is optional. Set ±2% to see optimistic/pessimistic ranges.
i

How this calculator compounds

This tool assumes each contribution starts earning interest immediately at the effective rate for your selected contribution frequency.

Future value of principal
FVprincipal = P × (1 + r/m)mt

Future value of contributions
FVcontrib = PMT × ((1 + i)n − 1) / i

  • P = initial investment
  • PMT = contribution per period
  • i = effective rate per contribution period
  • n = total number of contribution periods

Results

Ending Balance
$0
Total Contributed
$0
Interest Earned
$0

Rate Scenarios

Scenario Annual Rate Ending Balance

Growth Over Time

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