Every dollar you spend is a dollar that stops compounding.

We don't think spending is bad. We think spending without seeing the tradeoff is how decades disappear. Most of us were taught to look at price tags — the number on the sticker, the number at checkout — as if that's the whole story. It isn't. A dollar spent today is a dollar that never compounds. And compounding is the only financial tool that really works in silence, over long time.

There's no moral weight here. A bike might be worth every cent to you. A vacation might be the best money you've ever spent. The point isn't to talk you out of it. The point is to make the second number visible — the one that never shows up on a receipt. What it would have been worth, if it had stayed in the market.

So we built a calculator that runs the math in plain sight. You enter a price, a return, a horizon, and it shows you the other number. Not to shame you into minimalism — just to put both numbers on the table and let you decide. That's all a price tag was ever supposed to do.

Most purchases, when you look at both numbers, are still worth making. Some are not. The surprise is how often you can't tell which is which until you look.