Can you really start a business for under $100?

Yes — service businesses, resale operations, and digital agencies can launch for $20-$97. The key is starting with zero inventory (service-first) or minimal inventory (thrift flipping). Your biggest cost is time, not capital.

What's the fastest micro business to profit?

Service-based businesses profit fastest because there's no inventory cost. A social media management agency ($20 Agency model) can land a first client in 1-2 weeks. Resale businesses (thrift flipping) can profit from Day 1 if you source correctly.

How do you calculate break-even for a micro business?

Break-even = Fixed Costs ÷ (Revenue Per Unit - Variable Cost Per Unit). For a service business with $50/month in tools and $500/client revenue, you break even at 1 client in 10 days. Our calculator does this math instantly.

About | Micro Business Math

About Micro Business Math

Micro Business Math is part of a network of independent content sites focused on financial education, wealth building, and practical business strategies.

Break-even calculators, lean launch frameworks, and real P&L breakdowns for starting businesses under $100. No fluff — just the numbers that matter.

Every article on this site is written with real numbers, honest math, and actionable advice. We don't do hype — we show the calculations behind every strategy so you can make informed decisions.

Our Partner Network

We work with several partner sites that offer tools, communities, and resources:

The $97 Launch — Launch for $97
$20 Agency — Start a $20 Agency
The Resale Trap — Start Reselling
The $100 Network — Find Partners

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