Market Sizing Calculator — TAM, SAM and SOM
Size your market from the bottom up: real customers × a real price, not one percent of a number you read somewhere.
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Everyone with this problem, in the markets you'd ever serve
Your realistic annual price per customer
Right geography, language, channel and price
Of the reachable market, within ~3 years
Result
Enter your potential customers and a price to size the market.
Fill it in to save your result
Saving puts your market size on your own startup page, where it counts toward your Build Progress score.
TAM, SAM and SOM in one sentence each
TAM — every customer who has this problem, if you could serve all of them. SAM — the slice you could actually sell to: your geography, your language, your channel, your price point. SOM — what you can realistically capture in the next few years, given the team and money you actually have.
Why bottom-up beats top-down
Top-down sizing starts from an industry report and takes a percentage: "the market is $10B, we'll take 1%." Every investor has seen that slide and nobody believes it, because the 1% is chosen to produce a number the founder wanted. Bottom-up starts from units you can defend: how many customers exist, what share you can reach, what they pay. It usually produces a smaller number — and a far more convincing one, because each input can be argued with separately.
Sizing a MENA market specifically
Regional data is thinner than in the US, so build the number from what you can observe: businesses registered in your category, users on the platform you sell through, or the customers your competitors visibly serve. And size the market you can actually charge — a market of 40 million people where only two million can pay online is a two-million-person market until payments change.
Questions founders ask
What is a good TAM?
Big enough that the business could matter, small enough that you can name who is in it. A TAM you cannot describe in one sentence is usually too broad.
Should SOM be a percentage of SAM?
As a sanity check, yes — but derive it from capacity: how many customers can you actually reach and serve in the period, given your team and budget?
What share of the market is realistic in year three?
For most early startups, low single digits of a well-defined SAM. If your model needs 30% to work, the market is probably defined too narrowly.
Do I need a market research report?
No. Investors care far more that your inputs are defensible than that they came from a report — cite what you counted and how.
Every number here belongs on one page
StartupKit gives MENA founders a public startup page with a live Build Progress score — in Arabic and English. Free to start.
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