What if you invested €100 a month in Alphabet?

Use the calculator below to see what €100 a month into Alphabet (GOOGL) would be worth today, against putting the same total in on day one. Real daily prices, dividends reinvested, free and with no signup.

Why Alphabet specifically

Alphabet is a reminder that the ticker matters: GOOGL and GOOG are the same company with different voting rights and slightly different prices, so a backtest of one is not automatically a backtest of the other. This page runs GOOGL, the class A share.

Alphabet is Google's parent company. Change the ticker in the calculator above to run the same schedule on anything else — the numbers on this page are just one setting of it.

What this calculation does and doesn’t include

Contributions land on the first trading day of each month at the closing price. Dividends are included and treated as reinvested. Taxes are ignored, and so are the fees your broker charges on a small monthly purchase — on a €100 contribution a flat commission is a real drag that this does not model. The window is the free five-year one, which matters more than it sounds: five years is one market cycle at most, and a schedule that started five years ago is not the same experiment as one that started in 2007.

Above all, this is one company over one stretch of history that already happened. It cannot tell you what the next five years hold, and picking the ticker with the best number on this list is choosing with hindsight — which is the one advantage you will never have in advance.

The same question, other companies

Want to compare strategies rather than companies? The full backtester runs rule-based setups — moving-average crossovers, breakouts, mean reversion — against buy & hold on the same prices.