Cost of daily coffee: the real opportunity cost
Calculate how much money you could accumulate long-term if you invested, instead of spending on coffee every day, that same amount every month.
Results
Final capital
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Total contributed
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Interest generated
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The final capital is calculated compounding monthly: initial capital — (1 + r)^n, plus the future value of monthly contributions [(1+r)^n - 1] / r, where r is the monthly interest rate and n the number of months.
Capital evolution
Contributions vs. Interest
Year-by-year evolution
| year | Final capital | Total contributed | Interest generated |
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Cost of daily coffee: the real opportunity cost
One coffee a day seems like a small expense, but accumulated over years and compared with what that money could generate if invested, the difference is much larger than it looks at first glance. The fields are pre-filled with an example (€90 a month, about €3 a day, over 30 years at 7% annually); adjust the amount to your usual coffee price.
Spending €90 a month on coffee over 30 years means a direct outlay of €32,400. If that same amount had been invested every month at 7% annually, the final result would be €109,797.39: €77,397.39 more than the accumulated spend, thanks to compound interest over three decades of steady contributions.
You don't need to give up coffee to notice the difference: it's enough to be aware that every small, recurring expense has a much larger opportunity cost long-term than short-term, and redirecting even part of it into savings noticeably changes the 20-30 year result.
A middle ground between giving up coffee entirely and doing nothing is substitution: a home-brewed coffee costs roughly €0.20-€0.30 a cup, versus the €2-3 typical at a coffee shop - up to 10 times more for the same cup. Swapping just 3 or 4 coffee-shop coffees a week for home-brewed ones, while keeping the rest, already reduces monthly spending noticeably without giving up the habit entirely.
Frequently asked questions
Is it really worth giving up coffee over this?
The goal isn't necessarily to eliminate the expense, but to visualize its real opportunity cost. Each person can decide whether to keep the expense or redirect part of it into savings with this information.
Why 30 years and not less?
The compound interest effect is much more visible the longer the time horizon. You can change the years field to see the result at 10, 15 or 20 years and compare.
Does this calculator account for inflation?
No, it calculates the nominal growth of the money. To see the result in today's purchasing power, you can use this site's inflation simulator with the result obtained here.
Do I have to stop buying coffee at coffee shops entirely to notice the difference?
Not necessarily: a home-brewed coffee costs about 10 times less than a coffee-shop one (€0.20-€0.30 versus €2-3). Swapping just part of your usual consumption - on weekdays, for example - already reduces monthly spending noticeably without dropping the habit altogether.