For founders setting realistic revenue targets
Calculate your Serviceable Obtainable Market (SOM) - the realistic portion of SAM you can capture given competition, resources, and go-to-market strategy. Essential for revenue forecasting and hiring plans.
Your Market Share
5.0%
Serviceable Obtainable Market
$25.0M
Competitor Share
45.0%
Targeting 5% of your $500,000,000 SAM yields a $25,000,000 SOM. With competitors holding 45.0% market share, 55.0% remains available for capture.
Serviceable Obtainable Market (SOM) represents the realistic portion of SAM a company can capture in the near term, accounting for competitive dynamics, market entry barriers, and go-to-market capacity. SOM provides a grounded revenue target based on achievable market share rather than theoretical maximum potential.
SOM calculations factor in existing competitor market dominance, brand strength, distribution advantages, and the time required to build market presence. Most startups target single-digit market share initially, while established companies entering new segments may achieve higher capture rates based on brand transfer and existing customer relationships.
Your Market Share
5.0%
Serviceable Obtainable Market
$25.0M
Competitor Share
45.0%
Targeting 5% of your $500,000,000 SAM yields a $25,000,000 SOM. With competitors holding 45.0% market share, 55.0% remains available for capture.
Serviceable Obtainable Market (SOM) represents the realistic portion of SAM a company can capture in the near term, accounting for competitive dynamics, market entry barriers, and go-to-market capacity. SOM provides a grounded revenue target based on achievable market share rather than theoretical maximum potential.
SOM calculations factor in existing competitor market dominance, brand strength, distribution advantages, and the time required to build market presence. Most startups target single-digit market share initially, while established companies entering new segments may achieve higher capture rates based on brand transfer and existing customer relationships.
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SOM = SAM × Target Market Share %
Calculates realistic capture opportunity by applying target market share percentage to serviceable addressable market. Represents achievable revenue given competition and resources.
SOM is where market sizing meets revenue forecasting. It answers: "What can we realistically achieve?" A $100M SOM with clear path to capture is more valuable than a $10B TAM with no execution plan.
SOM forces competitive analysis. What share can you win from incumbents? How fast can you grow? What resources are required? These questions ground market analysis in operational reality.
Track SOM achievement over time. If you are capturing more than projected, your SOM was conservative. If less, reassess competitive dynamics or execution. SOM is a planning tool, not just a pitch deck number.
Well-funded startup entering established market with differentiated product
SOM of $60M representing achievable 3-year revenue target
Efficient company with niche focus and strong retention
SOM of $25M representing sustainable business opportunity
Early-stage startups typically target 1-5% of SAM over 3-5 years. Market leaders might eventually capture 20-40% in fragmented markets. Highly concentrated markets with strong incumbents may limit share to 5-10% even for successful challengers.
Strong incumbents reduce achievable share. Many competitors fragment attention and increase customer acquisition costs. Calculate SOM by analyzing competitor weaknesses, switching costs, and your differentiation strength.
Yes - SOM should align with bottoms-up revenue projections. If your sales model shows $50M achievable and your SOM says $200M, something is wrong. Use SOM as a sanity check on forecasts.
Calculate your total addressable market using top-down or bottom-up approaches
Determine the portion of TAM you can realistically serve with current capabilities
Calculate your market penetration rate and growth potential
Calculate your current market share and competitive position