SOM Calculator – Serviceable Obtainable Market
Estimate your serviceable obtainable market (SOM) — the share of your SAM you could realistically capture — with a market-share or sales-capacity method and a TAM → SAM → SOM funnel.
Written and reviewed by the CalcBundle editorial team. Transparent formulas · results are estimates, not advice.
Serviceable obtainable market
Enter your SAM (serviceable available market) greater than zero.
What is a SOM calculator?
SOM — serviceable obtainable market — is the portion of your serviceable available market that you can realistically win in the near term. It is the most grounded of the three market-sizing numbers because it factors in competition and your actual capacity to sell.
How to calculate SOM
- Market-share method: SOM = SAM × expected market share %
- Sales-capacity method: (salespeople × customers each × conversion %) × revenue per customer
The calculator caps SOM at your SAM — you cannot obtain more than the market you can serve — and shows the full TAM → SAM → SOM funnel.
The TAM → SAM → SOM funnel
TAM is the whole market, SAM is what you can serve, and SOM is what you can obtain. Each narrows the one above it. Investors expect to see all three, with SOM built from realistic, defensible assumptions.
Example
With a $10M SAM and a realistic 5% market share, your SOM is $500,000. If you instead model it bottom-up from your sales team’s capacity, you may arrive at a similar or lower figure — using both is a good cross-check.
SOM is an estimate, not a promise
Treat SOM as a reasoned target range, not a guaranteed outcome. Combine it with your startup valuation and unit economics (LTV:CAC) for a complete picture.
Frequently asked questions
What is SOM (serviceable obtainable market)?
SOM is the share of your serviceable available market (SAM) that you can realistically capture in the near term, given competition, your sales capacity and go-to-market.
How do you calculate SOM?
Two methods. Market share: SOM = SAM × expected market share %. Bottom-up: customers you can acquire (salespeople × capacity × conversion) × revenue per customer. This calculator supports both and caps SOM at your SAM.
What is the TAM, SAM, SOM funnel?
It's a three-level view of market size: TAM (the whole market), SAM (the part you can serve), and SOM (the part you can realistically obtain). Each is a subset of the one above it.
Is SOM a guarantee of revenue?
No. SOM is an estimate of what you could obtain under reasonable assumptions — it is not a forecast or a guarantee. Actual results depend on execution, competition and market conditions.
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Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. Market-size calculations are estimates and depend on the assumptions and data used. SOM is not a guarantee of revenue.