Latte Factor / Daily Habit Calculator

See what a daily habit costs — and what it becomes if you invest it instead.

How it works

Future value of an ordinary annuity: FV = PMT × ((1+i)^N − 1) ÷ i, monthly compounding at the stated return.

Frequently asked questions

Are these calculators private?

Yes — all computation happens in your browser. We don't store the values you enter.

What's the 50/30/20 budget?

50% needs, 30% wants, 20% savings & debt — a simple budgeting starting point.

How is net worth different from income?

Income is what you earn; net worth is what you own minus what you owe. Build net worth by keeping the gap between income and spending positive.

What's a FI number?

The portfolio size at which 4%/yr withdrawals indefinitely cover your annual expenses — i.e., 25× expenses.

Should I always take the higher-salary job?

Not always. Net of cost of living, taxes, commute, and benefits, the smaller salary sometimes wins.

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