DRIP Calculator

What DRIP means and how the projection works

DRIP stands for dividend reinvestment plan. Instead of a dividend payment being deposited as cash, it is used to buy additional shares of the same stock or fund, automatically and usually without a brokerage commission. Those new shares then earn their own dividends the following year, which buy still more shares, and the cycle continues. This calculator models that cycle year by year: each year it calculates the dividend based on the current portfolio value and yield, adds that dividend back into the value if reinvestment is on, adds any monthly contribution, and then grows the yield itself by the dividend growth rate you entered before moving to the next year.

The model compounds annually rather than simulating each individual dividend payment date, which is the same simplification most free DRIP calculators use. It is a reasonable approximation for a multi-year projection, not a substitute for the exact reinvestment statement a brokerage produces from real transaction history.

Why the reinvest toggle changes the outcome so much

Toggling Reinvest dividends off keeps the dividend as cash each year rather than adding it back to the compounding portfolio value, everything else in the calculation stays identical. Run the same starting investment, yield, growth rate and years both ways and compare the final portfolio value: the reinvested version compounds faster, because later years' dividends are calculated on a larger base. That gap between the two totals is the entire case for DRIP in one number, made concrete with your own inputs rather than a generic example.

A worked example

Start with a $10,000 investment at a 3.5% dividend yield, no dividend growth and no monthly contribution, projected 20 years.

1. With reinvestment on: each year's dividend is added back to the balance before the next year's dividend is calculated, so the effective compounding rate is roughly the yield itself, growing the position well beyond simple 3.5%-per-year cash payouts over two decades.
2. With reinvestment off: the portfolio value never grows from dividends at all (only from any monthly contribution you add), and the dividend paid each year stays flat at 3.5% of the original $10,000, since the balance generating it never increases.
3. Add a 5% annual dividend growth rate to either scenario and the gap widens further, since the yield itself is compounding upward year over year, not just the reinvested dollar amount.

What the annual dividend growth rate and monthly contribution fields do

The annual dividend growth rate field is optional and left blank by default, meaning the yield you enter stays flat for the whole projection unless you specify otherwise. Many established dividend-paying companies raise their dividend most years, so a realistic long-run figure (often somewhere between 3% and 8% for a company with a track record of increases, and 0% for one that doesn't) makes the projection meaningfully more accurate than assuming a permanently flat payout.

The monthly contribution field is also optional and models new money added to the position each month, separate from and in addition to the reinvested dividends. It's useful for projecting a dollar-cost-averaging strategy layered on top of DRIP, buying more shares with new savings every month while also reinvesting whatever the position itself pays out.

What this projection deliberately leaves out

This calculator tracks dividend income and reinvestment only. It does not model share price appreciation, the separate question of whether the stock's price itself rises or falls over the projection period. A real DRIP investor's total return combines both the dividend-driven growth modeled here and price movement, which this tool does not attempt to forecast since future price movement isn't something any calculator can responsibly predict. It also assumes a constant yield percentage each year (before applying your growth rate), doesn't account for taxes on reinvested dividends, and doesn't model brokerage-specific DRIP mechanics like fractional share rounding or plan-specific discounts some companies offer on shares purchased through their own dividend reinvestment program.