Total Addressable Market (TAM)
The total annual revenue opportunity for a product if it captured all demand in its defined market, before competition or capacity limits.
Market size shapes investment cases, territory design and how many accounts an ABM program can target. Investors and boards use TAM to judge growth ceilings, so an inflated figure undermines credibility in planning and fundraising.
A bottom-up estimate counts 18,000 EU logistics firms with 50 to 500 employees that match the ICP and multiplies by an average contract of $12,000 a year, giving a TAM of $216 million; SAM and SOM then narrow it by region and capacity.
TAM is a model, not a forecast: top-down figures from industry reports often overstate what a company can sell, and the market definition changes the result widely. No company captures all of its serviceable market.
TAM equals the number of potential customers in the defined market multiplied by average annual revenue per customer. Serviceable addressable market (SAM) is the share the company can serve given its product, geography and channels, and serviceable obtainable market (SOM) is the share it can realistically win in a set period. Top-down sizing starts from industry reports and applies filters, while bottom-up sizing builds from account counts and pricing, often using the Ideal Customer Profile (ICP).
Performance Advertising
Salesforce — TAM, SAM, and SOM: Made Simple for Growing Businesses — https://www.salesforce.com/blog/tam-sam-som/; HubSpot — TAM, SAM & SOM: What Do They Mean & How Do You Calculate Them? — https://blog.hubspot.com/marketing/tam-sam-som