SmallHabits,Big FortuneEngine
A Visual Compound Interest Calculator to Compare the Cost of Habits vs. Long-Term Investing
3 Steps to Uncover Hidden Cost of Habits
Identify the Habit
Type in your daily spend or pick a Popular Habit to start.
Input the Cost
Enter the price and frequency of the purchase.
See the Fortune
Visualize your potential wealth if you invested that money instead.
Total Wealth If Invested
$275,813
Over 30 years
Pure Compound Interest
$209,930
Earned at 8%
Total Habit Cost
$65,883
Out-of-pocket spending
The True Cost of Your Habit
Comparing out-of-pocket spending vs. potential future fortune
5 Years
$13,773
If invested instead
$11,133
Total cost of habit
+$2,640 pure compound interest
10 Years
$34,018
If invested instead
$22,083
Total cost of habit
+$11,936 pure compound interest
20 Years
$109,118
If invested instead
$43,983
Total cost of habit
+$65,136 pure compound interest
30 Years
$275,813
If invested instead
$65,883
Total cost of habit
+$209,930 pure compound interest
Your Habit
Daily Coffee
Compounding Timeline
Watch your profit outgrow your habit cost over 30 years
Export Your Fortune Report
Download a detailed breakdown of your habit's opportunity cost and potential growth milestones.
Habit Parameters
Popular Habits
For long horizons (10+ yrs), broad index funds historically average 9-10%.
Keep the Joy. Cut the Waste.
Wealth building isn't about deprivation. It's about redirecting your capital away from things you don't care about, so you can spend extravagantly on the things you love.
The "Stop Buying Coffee" Myth
Let's be clear: this calculator isn't here to guilt you into cutting out things you love. If a $6 morning latte brings you genuine joy and sets the tone for a productive day, buy it! Wealth is practically useless if you are miserable building it.
"Spend extravagantly on the things you love, and cut costs mercilessly on the things you don't." — Ramit Sethi
The Invisible Drain on Your Future
The true power of this engine is visualizing the cost of unconscious, forgotten, or low-value expenses.
Are you paying $15/month for a streaming service you haven't watched in 6 months? That isn't "enjoying life"—that is just a leak in your financial bucket.
What about those redundant app subscriptions, unused gym memberships, or buying lunch out purely out of poor planning rather than genuine enjoyment?
The objective: Identify the expenses that bring you little-to-no joy, and re-route that money into investments. You keep the fun habits, while letting the forgotten ones build your fortune.
Silent Wealth Killers
Identify the "ghost expenses" that haunt your statement without adding value.
The "Ghost" Streamer
That $15 service you haven't opened in 3 months.
The App Graveyard
Recursive $4.99 app trials you forgot to cancel.
Convenience Over-Tax
DoorDash fees that double a $15 meal into $30.
Unused Wellness
The "resolution gym" membership you never use.
How to use the Habit Fortune Engine
Identify the Habit
Enter the name of your recurring expense (e.g., 'Daily Coffee') or choose from our Popular Habits list.
Input Basic Math
Define the cost per unit and how often you incur it. Consistency is the key to accurate projections.
Set Your Horizon
Decide how many years you want to model. Compounding needs time to work its magic.
Adjust the Engine
Model your growth with Expected Returns. Use 'Auto-Suggest' for a baseline based on market history.
Analyze the Delta
Compare 'Out-of-Pocket Spent' vs. 'Potential Fortune' to find your motivation to start saving today.
The Power of Habit Arbitrage
Financial freedom isn't always about earning more; it's about reclaiming what you already spend on things that don't serve your future self.
By diverting even $5 a day from an unconscious habit into a low-cost index fund, you are effectively buying your future time at a massive discount.
Wealth Insight
"A habit is either a tax on your future or an investment in your freedom. This engine helps you choose which one it will be."
Frequently Asked Questions
Master the mechanics of your financial journey.
QWhy does a $5 coffee cost so much in 30 years?
QWhat return rate should I use?
QWhat is 'Habit Arbitrage' and how do I start?
Ramit Sethi's Intentional Spending
QCan these small amounts really lead to retirement?
Vanguard's Investing Principles
Explore Related Tools
Continue your journey to financial independence by exploring the rest of the toolbelt.
Questions or Feedback?
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