Free toolResearch
Market Size Calculator
Top-down market sizing — 1% of a $10bn market — convinces nobody. This builds it bottom-up from the number of businesses that could buy and what they would pay.
Your numbers
Result
SOM — realistic 3-year target
$1.06M
- TAM — total market
- $294.00M
- SAM — serviceable market
- $35.28M
- Customers at SOM
- 1,800
What this means
A defensible SOM at this size. The number that matters is whether you can name the first hundred customers.
Questions people ask
Why bottom-up?+
Because top-down sizing is unfalsifiable and everyone knows it. Bottom-up forces you to state how many customers exist and what they pay — both of which can be checked.