How will dividend reinvestment grow my portfolio?

How DRIP Is Calculated

Each time a dividend is paid, it purchases additional shares at the current price. As share count grows, each dividend payment increases, buying even more shares. The effect compounds dramatically over long periods.

For each year, split into periodsPerYear sub-periods:
  yieldPerPeriod = currentYield / periodsPerYear
  priceGrowthPerPeriod = (1+priceAppreciation/100)^(1/periodsPerYear) - 1
  DRIP: dividend = dripValue*yieldPerPeriod; dripValue += dividend; dripValue *= (1+priceGrowthPerPeriod)
  No-DRIP: dividend = noDripValue*yieldPerPeriod (paid out, not reinvested); noDripValue *= (1+priceGrowthPerPeriod)
After each year: currentYield *= (1+dividendGrowth/100)
finalAnnualDividends = dripValue * dividendYield/100 * (1+dividendGrowth/100)^years
totalReturn = (finalDripValue - initialInvestment)/initialInvestment * 100
Where:
initialInvestment (default 50000), dividendYield % (default 3), dividendGrowth % per year (default 5), priceAppreciation % per year (default 5), paymentFrequency (annual=1,quarterly=4,monthly=12,weekly=52; default quarterly if unrecognized), years (default 20)
Assumptions:
Price appreciation is converted to a per-period compounding rate via a geometric root of the annual rate, compounded each sub-period
Dividend yield grows once per year (not per sub-period) by dividendGrowth%
DRIP reinvests dividends then applies price growth; no-DRIP dividends are tracked separately as cash, not compounded
All values rounded to nearest whole number in year-by-year output