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A side-by-side of both methods that makes clear why you use bottom-up as your primary number and top-down only as a rough check. That distinction is exactly what protects you when the top-down Indian data is thin. Read it to decide which method to lead with in your deck.

Top-Down vs Bottom-Up Market Size Calculation

From Waveup by Waveup 14 min read

Bottom-up is defensible, top-down is only a directional check
Use both and reconcile them against each other
Lead with the method your data can actually support

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Answers How do I size a market for India specifically when data is messy? Investors keep asking for a top-down TAM slide, but I built my number bottoms-up. Which do I show? How do I size a market I want to sell to businesses outside the big Indian startup hubs? Two of us disagree on how big the opportunity is. How do we resolve a market-size argument between cofounders?

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