Free Tool
TAM SAM SOM Calculator
Estimate your Total Addressable Market (TAM), Serviceable Addressable Market (SAM), and Serviceable Obtainable Market (SOM) in seconds. Enter your industry, geography, and pricing to get instant market sizing with visual breakdowns and revenue projections.
Calculate Your Market Size
Annual revenue per customer. For monthly subscriptions, multiply by 12.
What Are TAM, SAM, and SOM?
Total Addressable Market
TAM represents the total revenue opportunity available if your product achieved 100% market share. It is the broadest measure of market size and answers: “How big is the entire market?” TAM is useful for understanding the overall opportunity, but no company captures 100% of its TAM.
Serviceable Addressable Market
SAM is the portion of TAM that your product or service can actually reach, filtered by your target geography, customer type, and distribution channels. It answers: “How much of the market can I realistically serve?” SAM is more useful than TAM for business planning because it accounts for your specific constraints.
Serviceable Obtainable Market
SOM is the portion of SAM that you can realistically capture in a given timeframe, typically year one. For most startups, SOM is 1-3% of SAM. It answers: “How much revenue can I actually generate?” SOM is the most grounded metric and the one investors care about most in early-stage pitches.
How to Use TAM SAM SOM in Your Pitch Deck
Investors expect a TAM/SAM/SOM slide in every pitch deck. It shows you understand the size of the opportunity and have a realistic plan for capturing market share. Here is how to present it effectively:
Start with TAM to show the total opportunity. Use credible industry reports or bottom-up calculations. Investors want to see that the market is large enough to support a venture-scale business.
Narrow to SAMby filtering for your target geography, customer segment, and distribution model. This shows you are not claiming the entire market — you understand your specific niche.
Ground it with SOM to show your realistic year-one revenue target. A SOM of 1-3% of SAM is credible for a startup. Anything higher needs strong justification — existing traction, partnerships, or unique distribution advantages.
The best pitch decks combine market sizing with real validation data. Numbers from a calculator are estimates. Real clicks, signups, and conversion data from actual customers prove there is genuine demand.
Common Market Sizing Mistakes
Claiming you will capture 10%+ of the market
New startups rarely capture more than 1-3% of their SAM in year one. Claiming a larger share without evidence undermines your credibility with investors. Be conservative and back it up with a clear go-to-market plan.
Using only top-down estimates
Top-down sizing (“the market is $500B, we just need 0.1%”) is lazy and unconvincing. Combine it with bottom-up math: number of potential customers multiplied by your average revenue per customer. Both methods should point to the same range.
Confusing TAM with SAM
Your TAM is the entire global market. Your SAM is the slice you can actually serve. If you are building a B2B SaaS for US small businesses, your SAM is not the entire global SaaS market. Be precise about your filters.
No validation behind the numbers
Market sizing without validation is just math on a spreadsheet. The strongest founders pair their TAM/SAM/SOM analysis with real demand signals — pre-orders, waitlist signups, ad campaign data, or letters of intent from potential customers.
Want real validation data?
Market sizing is a starting point. To know if people will actually pay, you need real demand signals. TryBuildCo runs real ad campaigns and delivers CPC, CTR, and conversion data from real people in 24 hours.
Test My Idea with Real Ads