Serviceable Addressable Market (SAM)

What it actually means

TAM answers "how big is this market if every dollar spent on this category came to us." SAM answers a narrower, harder question: given the product you've actually built, the price you actually charge, the regions you can actually sell into, and the channels you actually have, who can you realistically reach? Per SaleShive's framing, SAM translates market potential into a specific set of accounts and decision-makers that fit your ICP, not a hypothetical universe.

SOM narrows it further to what you can win in a given period against actual competition. So the chain is: TAM (everyone who could ever buy this category), SAM (everyone you're actually positioned to sell to), SOM (who you'll realistically close this year).

Why it matters if you sell B2B

SAM is the number that should drive your territory planning, quota setting, and pipeline math. If your AE team covers mid-market SaaS companies in North America with 50-500 employees, your TAM might be every company globally that could theoretically use software like yours. Your SAM is that same market filtered down to the accounts you can actually reach with your current sales motion, language, pricing, and compliance posture. Quota math built on TAM instead of SAM produces targets nobody can hit, because the number was never reachable to begin with.

The mistake founders and reps make

The common failure is pitching TAM in decks and LinkedIn posts because it's the bigger, more exciting number, then quietly using SAM (or something closer to SOM) internally to run the business. Investors and prospects who've seen enough of these pitches know the tell: a $50B TAM slide with no SAM breakdown usually means nobody has done the filtering work. AgencyAnalytics frames SAM as the tool for market prioritization, the thing that tells you which segment is actually viable, not which number sounds best on a slide.

How it's actually measured

Start from TAM, then apply real constraints: geography you can service, languages you support, deal sizes your sales motion can profitably close, regulatory or compliance walls, and channel reach. What's left is SAM. It should shrink every time you add a real constraint, and if it doesn't, you probably haven't applied one yet.