- What's the formula?
- Future value of an ordinary annuity at weekly cadence. With C = weekly spend (drink price × times per week), r = annual return ÷ 52, and n = years × 52: FV = C × ((1+r)^n − 1) / r. When r = 0 (no investment return), the formula collapses to FV = C × n — pure savings, no growth. Total spent is the same C × n. The opportunity cost is FV − total_spent. Each week's contribution gets the remaining weeks to compound, which is the same math the Dollar-Cost Averaging Calculator uses for any recurring contribution.
- Is Suze Orman's $1 million latte claim true?
- Under her assumptions, yes — but the assumptions are aggressive. The original 1999 example used roughly $1/day at ~11% annual returns for 50 years. Plug those in here ($1 × 7 days/week, 50 years, 11%) and you'll get about $800k FV from $18,200 spent. To hit $1M you need either a higher daily spend, a longer horizon, or a higher return. The math is correct; the caveat is that 11% is the long-term S&P 500 NOMINAL return, not real. After 2.5%/yr inflation, the real purchasing power is closer to $300k in today's dollars — still a lot, but not seven figures. The point of the calculator isn't to vindicate or debunk her — it's to let you run the numbers honestly.
- Why not just compare total spent against a simple savings account?
- Because the comparison only matters if you'd actually invest the money. A high-yield savings account at 4% APY gives a very different answer than a stock-index portfolio at 7% real. The calculator lets you set the return to whatever scenario you want to test — 0% (cash under the mattress), 4% (HYSA), 7% (long-term stocks, after inflation), 10% (long-term stocks, before inflation). Same coffee, dramatically different opportunity costs depending on where the money would have gone.
- Does this account for inflation?
- Not directly. To get an inflation-adjusted answer, enter a REAL return (e.g. 7% for stocks) and the final number is already in today's dollars. To see the gross-dollar (nominal) answer that would show up on a brokerage statement, enter a NOMINAL return (e.g. 10% for stocks) — but remember the future-dollar amount has less purchasing power than today's equivalent. Most retirement-planning conversations use real returns for exactly this reason. The Dollar-Cost Averaging Calculator linked below has an explicit inflation field if you want to compare nominal and real side-by-side.
- What return should I assume?
- For long-horizon, diversified stock portfolios: 7% real (after inflation) is the historical mean, 10% nominal is the long-term S&P 500 figure. For a balanced 60/40 mix: 5% real, 7-8% nominal. For bonds: 1-3% real. The calculator defaults to 7% — a reasonable real-return assumption for an investor in their working years with a multi-decade horizon. If you'd actually put the saved coffee money in a high-yield savings account, use 4% (close to the post-2023 nominal rate, but only barely positive after inflation).
- Would I really save the money if I stopped buying coffee?
- Probably not all of it — that's the honest answer behavioral finance has built around the latte factor. Most people who quit a recurring habit end up replacing it with another one (a different drink, an upgraded breakfast, a more expensive coffee maker that takes a year to pay off). The compounding math is real, but it assumes a level of saving discipline that's rarer than the math implies. If you want to actually capture the gap, automate the transfer — set up a recurring transfer to a brokerage account for the exact weekly amount the day after you'd usually buy coffee. Out of sight, out of spend.
- What about the cost of brewing coffee at home?
- The calculator compares against zero — i.e. it assumes "no coffee" as the alternative. In reality, home brewing costs $0.20-0.50 per cup (good beans, drip or French press) up to $1.50 per cup (espresso machine amortized). If you'd switch to home brewing rather than quit entirely, your true opportunity cost is the gap between cafe price and home cost, not the full cafe price. To model that, enter the difference as your custom drink price (e.g. $5.00 cafe latte minus $0.75 at-home cappuccino = $4.25 custom).
- Is this a moral judgment about coffee?
- No. There's a reason this calculator's copy doesn't tell you to skip coffee. Real money decisions are about trade-offs between things you value — and a $5 daily ritual that genuinely brings you joy is a perfectly defensible use of $1,800/year. The calculator's job is to make the trade-off legible: this is what compounding does to recurring spend, here's the gap, decide for yourself. The same math applies to any recurring expense — streaming subscriptions, lunch out, ride-shares, lottery tickets. Coffee is just the most-cited example.
