"Opportunity cost" sounds like a textbook term, but it's a genuinely simple idea: every time you spend money, you're also giving up whatever that money could have become if you'd done something else with it instead. Here's what that looks like with three real, different kinds of examples.
It's not a judgment about whether a purchase is "worth it." It's just the honest other half of the decision — the number most price tags leave out. Future Worth is built entirely around making that other half visible.
A $6-a-day coffee habit is $180 a month. Over 20 years, that's $43,200 spent — and the same amount invested instead could be worth roughly $75,680 in today's dollars.
A $6/day coffee habit, spent versus invested, over 20 years.
An extra $200 a month spent dining out, over 15 years, comes to $36,000 spent — versus roughly $53,207 if invested instead.
A single $25,000 purchase with no resale value — a boat, a big renovation, a vacation home upgrade — invested instead at the same return would be worth about $129,368 in today's dollars after 25 years. That's an opportunity cost of roughly $117,428, since the original purchase itself is worth nothing by then.
| Example | Spent | Could have been (today's $) |
|---|---|---|
| $6/day coffee, 20 years | $43,200 | $75,680 |
| $200/mo dining out, 15 years | $36,000 | $53,207 |
| $25,000 one-time purchase, 25 years | $25,000 | $129,368 |
Opportunity cost isn't a reason to avoid every purchase — plenty of spending is genuinely worth it. It's a reason to actually see the tradeoff before making a decision, rather than assuming a small-feeling expense stays small. A number you can see is a number you can actually weigh.
Run your own numbers, for any kind of purchase, in the calculator.