TAM SAM SOM template for startups

A bottom-up market sizing worksheet for founders: target buyers, annual spend, reachable segment, first wedge, assumptions, and evidence.

Worksheet

• TAM: all target buyers multiplied by realistic annual spend.
• SAM: reachable subset based on product scope, region, and segment.
• SOM: near-term wedge the startup can win with current channels.
• Evidence: interviews, competitor pricing, reports, and pipeline data.

Read the full market sizing guide.