Question 1

How is the invested value calculated?

Accepted Answer

The calculator treats your daily spending as a monthly contribution (daily spend × 30.44) and compounds it at the annual return you set, with monthly compounding. All habit entries are summed to give the total.

Question 2

What annual return should I use?

Accepted Answer

A long-term global stock market average is often cited around 7–10% per year in nominal terms. A conservative estimate of 7–8% accounts for average inflation. You can adjust the return to match your own expectations.

Question 3

Does this account for taxes or fees?

Accepted Answer

No. The calculator shows gross growth before taxes, brokerage fees, or fund costs. In practice, taxes on dividends and capital gains, as well as fund fees, will reduce the final amount.

Question 4

Is cutting coffee really worth it?

Accepted Answer

The point is not to stop enjoying life — it is to understand the compounding effect of small, recurring amounts over a long time horizon. You decide what trade-offs make sense for you.

Question 5

Can I add my own spending habits?

Accepted Answer

Yes — use the "Add habit" button to add any recurring daily expense. Rename it and enter your own daily amount.

Coffee vs Investing Challenge

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