A daily café coffee feels small in the moment, but multiplied across a year it's often a four-figure line item — and the gap between café and home-brewed pricing can be 5-10x per cup. This calculator turns your actual habit into a yearly number, breaks down the cost per cup both ways, and shows what redirecting the difference into an investment could become.
How the calculator works
Your café annual spend is simply weekly café cups multiplied by your average price per cup, extrapolated across 52 weeks. Your home cost per cup starts from a bag of beans divided by the cups it yields, plus a small fixed add-on for milk, filters, and other incidentals — then extrapolated the same way across your weekly home cups. The invest-the-difference projection takes the annual savings from moving café cups to home brewing, divides it into a monthly amount, and runs it through the standard future-value-of-an-annuity formula at your chosen return and horizon.
Why home brewing is usually so much cheaper
A café coffee's price covers more than beans — rent, labor, cups, and a margin are baked in. A bag of beans brewed at home spreads its cost across 20-28 cups with no markup beyond the ingredients themselves, which is why the per-cup gap is typically 5-10x. Espresso-based drinks with milk narrow that gap somewhat since home versions need an espresso machine and milk too, but drip coffee stays dramatically cheaper brewed at home.
Limits and edge cases
This is an editorial estimate, not a certified budgeting tool — actual café prices, bean prices, and cups-per-bag vary by region, roast, and brewing method. The investment projection assumes a constant annual return compounded monthly with no fees or taxes, which real investments rarely deliver exactly; treat the future-value figure as a rough illustration of compounding, not a guarantee. If you already own brewing equipment, its cost isn't included here — you can mentally amortize it into your bean price if you want a more complete picture.