Latte Factor Calculator
See how small daily expenses compound over time — and what that money could be worth if invested instead.
The Latte Factor, popularized by David Bach, shows how small recurring expenses compound into enormous sums over decades. A $5 daily coffee doesn't just cost $1,825/year — at 7% investment returns, that money would grow to over $106,000 in 30 years. This calculator helps you see the true opportunity cost of any daily habit, so you can decide which expenses are worth keeping and which are quietly draining your wealth.
Your $5/day habit costs $25,980 over 20 years. If invested at 7%, it would grow to $56,719 — that's $30,739 in lost compound growth.
The real cost of your daily habit
Monthly cost
$108
Annual cost
$1299
20-year total
$25,980
If invested instead
$56,719
How to use this calculator
Daily cost — The cost of your recurring daily expense — coffee, lunch, snacks, parking, etc. Even $3–$5/day adds up dramatically over decades.
Days per week — How many days per week you make this purchase. Weekdays only = 5, every day = 7.
Investment return — The annual return you could earn by investing this money instead. The S&P 500 has returned ~7% real (after inflation) historically.
Time horizon — How many years to project. The longer the timeframe, the more dramatic the compounding effect. Try 20–30 years for full impact.
Real-world examples
Daily coffee: $5/day
$5 coffee, 5 days/week, at 7% over 30 years: you spend $39,000 but miss out on $106,000 in investment growth. The total opportunity cost exceeds $145,000 — for coffee alone.
Eating lunch out: $15/day
$15 lunch, 5 days/week, at 7% over 20 years: $78,000 spent vs $163,000 if invested. That daily lunch choice costs you $85,000 in lost wealth over two decades.
Cutting just $3/day
Reducing daily spending by just $3 (skip the pastry, brew at home one day) and investing the difference at 7% for 30 years: grows to ~$64,000. Small cuts, big results.
Formula & Methodology
Future value of recurring monthly investment
- PMT = Monthly investment amount (daily cost × days/week × 4.33)
- r = Annual return rate (decimal)
- t = Time in years
Assumptions & limitations
- Monthly cost is estimated as daily cost × days/week × 4.33 weeks/month.
- Investment returns are assumed constant. Real markets fluctuate significantly.
- Taxes on investment gains are not included.
- This is not about eliminating all small pleasures — it's about making intentional choices.
Frequently asked questions
What is the Latte Factor?
Coined by David Bach, it illustrates how small daily expenses (like a $5 coffee) compound into huge sums over time. It's not about never buying coffee — it's about being intentional with small recurring costs.
Is the Latte Factor realistic?
The math is real: $5/day at 7% = ~$106K in 30 years. But critics note that cutting small joys can backfire. The key is finding expenses you don't actually value, not depriving yourself.
Should I feel guilty about small purchases?
No. The point isn't guilt — it's awareness. If that daily coffee genuinely improves your life, keep it. But most people have $50–$100/month in subscriptions or habits they don't really value. Redirecting that money is painless saving.
What's more impactful — cutting small costs or earning more?
Both matter, but earning more has a higher ceiling. However, cutting unnecessary costs is faster and more reliable. The ideal approach: cut expenses you don't value AND increase income. Use the savings to invest.
Does this apply to one-time purchases too?
Yes, but the effect is smaller. A $1,000 one-time purchase not invested costs ~$7,600 in 30 years at 7%. A $5/day habit costs ~$106,000 because it recurs every single day. Frequency amplifies the effect enormously.