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Latte Factor Calculator

Find out what your daily coffee really costs over a decade.

How it is calculated

The tool turns a daily habit into a monthly investment and compounds it. Annual cost is daily cost × 365, and the monthly amount is that divided by 12. With i = annual return / 100 / 12 and n = years × 12, the investment value is FV = monthly × ((1 + i)n − 1) / i. If the return is 0 it is simply monthly × n.

This treats the money as deposited at the end of each month and compounded monthly, with a fixed return and no taxes, fees or inflation. Daily cost and years cannot be negative. The three results are the invested value, the total spent (annual cost × years) and the annual cost. Money is shown in dollars, and every day counts, since the tool uses 365 days a year.

Worked example

A $5 coffee every day for 10 years at an assumed 7% yearly return. Annual cost = 5 × 365 = $1,825, so the monthly amount is 1,825 / 12 = $152.08. The monthly rate is 0.07 / 12 = 0.5833%, and there are 120 months. Compounding the deposits gives an invested value of $26,323.31. The total actually spent is 1,825 × 10 = $18,250.00, so the difference of about $8,073 would be growth on the invested money.

Try this example →

Common mistakes

  • Entering the weekly or monthly cost in the daily field. The tool multiplies by 365, so a $35 weekly spend should be entered as $5 per day.
  • Entering the return as a decimal (0.07) instead of a percent (7). The tool divides by 100 itself, so 0.07 would mean 0.07 percent a year.
  • Counting only workdays but expecting the tool to know. It assumes the habit happens all 365 days, so enter an average daily figure if you buy coffee on only some days.
  • Reading the invested value as guaranteed. It uses one fixed rate for the whole period; real returns vary and the tool ignores inflation, taxes and fees.
  • Comparing the invested value with the total spent and calling the whole gap profit. Part of the gap is just the effect of compounding on your own deposits over time.

Sources

About this calculator

The Latte Factor, a term popularized by financial author David Bach, refers to small, easy-to-overlook recurring expenses — the classic example being a daily coffee purchase — that seem trivial individually but add up to a significant sum when totaled over months or years, and become even larger if that money had instead been invested and allowed to compound.

This calculator takes a small recurring expense (say, five dollars a day) and projects its cumulative cost over time, then compares it against what that same money would have grown to if invested at a given rate of return instead of spent. The point isn’t that anyone must give up coffee, but that small daily spending decisions carry a real, calculable opportunity cost, and seeing that number is meant to prompt a conscious choice rather than an automatic one.

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Comments (1)

  • Editorial team

    Set the return to 0 and the tool shows only the money you would have saved, which equals the total spent. Then set it back to your assumed rate and the gap between the two runs is the part that compounding contributes. That keeps the saving and the investing assumption apart, so you can judge each one. Tell us the daily amount you tried and the return you picked, and whether it still looked reasonable.

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