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Market Sizing Estimate

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Estimate the opportunity with transparent assumptions.

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Estimate market size. Product and target customers: [PRODUCT_AND_CUSTOMERS]. Region: [REGION]. Data sources I have (public statistics, reports): [DATA_SOURCES]. Pricing assumption: [PRICING].

Do a bottom-up estimate: number of potential customers (with source), share who fit our criteria, expected adoption over three years, price per year, giving total addressable market (TAM), serviceable market (SAM), and obtainable market (SOM) with the arithmetic shown. Do a top-down check using industry figures I supply. Compare the two and explain gaps.

Show a table of assumptions: Assumption | Value | Source | Confidence | Sensitivity (effect of plus or minus 20 percent). Add a range (low, base, high) and a note on what would need to be true for the high case. Do not invent statistics; where I did not give data, write "needed" and say where to find it. Warn about the common mistake of "1 percent of a huge market".

Express the final answer as a range with low, base, and high figures and state which one assumption moves it most. List the data you would buy or look up to tighten the estimate, with a rough effort for each.

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See an example result (fictional data)
Bottom-up: dental clinics in region 4,200 (source: association report, 2024). Fit criteria: 3 to 15 staff = 62 percent, 2,604 clinics. Adoption in three years 8 percent = 208 clinics. Price 1,800 a year. SOM = 208 x 1,800 = 374,400.
SAM = 2,604 x 1,800 = 4,687,200. TAM (all 4,200) = 7,560,000.
Top-down check: dental software spend in region 85 million (industry report); share for scheduling software 6 percent = 5.1 million. Within the range of SAM.
Assumptions: adoption 8 percent (guess); sensitivity plus or minus 20 percent changes SOM to 299,520 to 449,280.
Low, base, high: 260,000; 374,000; 520,000.
Needed: confirm number of clinics and pricing with 10 interviews.

Illustrative only, made-up data. Your results will differ and must be reviewed.

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