Understand your customers

How do I size the market and figure out if it's big enough?

The short answer

Build it bottom-up, not from a scary McKinsey top-down number: who exactly is the customer, how many are there, what will they pay, and how will you reach them. A believable ₹X-per-customer times a reachable count beats any 'it's a $10B market' fantasy.

Go deeper, your way

2 hand-picked resources, 1 link-checked. Pick how you want to dig in.

📄 Article
✓ Link checked Free Intermediate

Why we picked it The reference primer on the metrics and market-sizing logic investors use, including bottom-up market sizing that keeps founders honest about how big a market really is. Canonical a16z source.

16 Startup Metrics

From a16z by Andreessen Horowitz (a16z) ~15 min read

  • Size markets bottom-up from customer count and willingness to pay
  • Know the metrics that actually signal a healthy business
  • Distinguish real traction from vanity metrics
  • Use consistent definitions when comparing yourself to the market
Open a16z.com →
📖 Book
Paid Intermediate

Why we picked it The best book on positioning against competitors by understanding the alternatives customers actually consider. Directly turns competitive research into a market advantage.

Obviously Awesome: How to Nail Product Positioning so Customers Get It, Buy It, Love It

From aprildunford.com by April Dunford ~200 pages

  • Your real competition is often the status quo, not another product
  • Start positioning from the competitive alternatives your buyers consider
  • Differentiated value comes from your unique capabilities vs those alternatives
  • Choose the market frame that makes your strengths obvious
Open aprildunford.com →

People also ask

How do I research my competitors properly? Go beyond their homepage: sign up, read their reviews, their churned-customer complaints, their job posts, and their pricing page. The gold is in w... Beginner 2 resources → What if my customers say they have no competitors, is that good or bad? Almost always bad, because it usually means the job isn't painful enough to spend money or effort on. If nobody's built anything, ask what people c... Beginner 2 resources → What tools should I use to track competitors and market landscape? Start free and manual before you pay for anything: Google Alerts and their newsletter for moves, G2/Capterra reviews for weaknesses, Crunchbase for... Intermediate 2 resources → How do I position against a bigger, better-funded competitor? Don't fight them on their strengths, reframe the category so your strengths matter most. Anchor on the competitive alternatives your best customers... Advanced 2 resources → How do I understand the competitive landscape for an Indian market specifically? Don't assume the US playbook maps onto India, pricing power, distribution, and willingness-to-pay are wildly different. Study who Indian customers ... Intermediate 2 resources → How do I do competitive research when my competitors are private and share almost no public numbers? Stop hunting for a leaked cap table and read the signals that are actually public: job postings (what they're building and where they're weak), pri... Intermediate 3 resources →

Also in How Founders Use AI

How founders actually use AI for this, over in Market Research.

How do founders validate a startup idea with AI in a weekend? Treat AI as a fast research assistant, not the judge. On day one, have ChatGPT or Claude turn your idea into testable assumptions, competitor lists... 20 resources → How do I use AI to map competitors, pricing, and positioning? Use a deep research tool (ChatGPT, Gemini, or Perplexity) to build the first competitor landscape in an hour: who they are, features, pricing pages... 22 resources →
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