Description
An Excel template for founders, students and consultants who need a market size they can defend.
What is included
- Top-Down sheet: total customers x revenue per customer gives TAM. Apply your own geography, segment and fit filters to reach SAM, then a realistic share to reach SOM.
- Bottom-Up sheet: build revenue from sales channels, people reached, conversion and revenue per customer.
- Summary sheet: TAM, SAM, SOM and bottom-up revenue together, a check that the two methods agree within 2x, and a one-line summary ready to paste into a slide.
- A Source column next to every input so you can cite where each number came from.
Good to know
- This template contains no market data. The starting numbers are examples; replace them with figures you can source.
- Works in Microsoft Excel. No macros.
Read the guide
Learn the method in our TAM SAM SOM guide.
Instant download after purchase. Questions: contact us.





















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