Free tool
Calculate your TAM, SAM, and SOM
Enter your market numbers to get Total Addressable Market, Serviceable Addressable Market, and Serviceable Obtainable Market instantly. Free, no signup.
Free, no signup. Nothing you enter here is stored.
How it works
Enter your total market size
Start with the total addressable market — everyone who could ever conceivably buy what you sell.
Narrow to what you can reach
Apply a realistic percentage based on your actual geography, channel, and product fit to get your serviceable addressable market.
Estimate what you can win
Apply a realistic obtainable share to get the number that actually matters for a near-term revenue plan.
Why use this tool
Three numbers investors expect to see
TAM, SAM, and SOM are a standard slide in almost every pitch deck — this calculates all three from one flow.
Forces a reality check
Going from TAM to SOM forces you to justify each narrowing step, instead of quoting a huge TAM with no credible path to revenue.
Instant recalculation
Adjust your percentages and see the SAM and SOM update immediately, useful for stress-testing different assumptions.
No spreadsheet setup
Skip building a market-sizing spreadsheet from scratch for a number you might only need once for a pitch.
Free, no signup, no limit
Model as many market scenarios as you want with no account required.
Nothing you enter is stored
Market figures stay in your browser — nothing is logged or sent to a server.
When you'd actually use this
Building a pitch deck for investors
Get defensible TAM, SAM, and SOM numbers for the market-sizing slide before a fundraising round.
Writing a business plan
Market sizing is a standard section lenders and investors expect to see backed by a clear methodology.
Evaluating a new market or vertical
Before expanding into a new segment, size how much of it you could realistically capture.
Sanity-checking a competitor's claimed market size
Run their claimed TAM through the same SAM/SOM narrowing to see if their obtainable market claim holds up.
Setting a realistic revenue target
SOM translated into revenue gives a grounded ceiling for near-term growth planning.
Tips for best results
- 1Base your TAM on a credible external source (industry report, government data) — a TAM you invented yourself won't hold up under investor scrutiny.
- 2Keep your SAM percentage tied to real constraints — the countries you actually operate in, the channels you actually have access to.
- 3Investors are skeptical of SOM above 10-20% of SAM for a new entrant — use comparable companies' actual market share as a benchmark.
- 4Recalculate whenever your go-to-market strategy changes — expanding into a new channel or geography changes your SAM, not just your SOM.
Frequently asked questions
What do TAM, SAM, and SOM stand for?
TAM is Total Addressable Market (everyone who could ever buy this), SAM is Serviceable Addressable Market (the part you can realistically reach given your geography, channel, and product), and SOM is Serviceable Obtainable Market (the share you can realistically win).
Why do investors care about TAM/SAM/SOM?
It's a standard way to show a market is big enough to be worth investing in (TAM) while being honest about what's realistically capturable in the near term (SOM) — a huge TAM with no credible SOM path is a common pitch deck red flag.
How do I estimate the percentages realistically?
Base the reachable percentage on real constraints (which countries or channels you actually operate in), and the obtainable percentage on comparable companies' actual market share after several years — investors are skeptical of obtainable percentages above 10-20% for a new entrant.
Does this calculator store the numbers I enter?
No — every calculation happens in your browser and nothing is saved or sent anywhere.
Where should my TAM number come from?
Ideally a credible external source — an industry analyst report, government trade data, or a well-cited market research figure — rather than a number you estimated yourself, since investors will ask for the source.
Is a bigger TAM always better for a pitch deck?
No — an implausibly large TAM with no clear SAM/SOM narrowing logic often reads as a red flag rather than a strength. A smaller, well-justified TAM with a credible SOM is usually more convincing.
How often should I update my TAM/SAM/SOM numbers?
Revisit them whenever your target market, geography, or product scope changes meaningfully — and periodically as your company matures, since your SOM should grow as you gain actual market share and proof points.
Can I use this for a niche B2B market, not just consumer products?
Yes — the same top-down logic applies whether your total market is measured in consumers or in target companies; just make sure your source data matches the market you're actually sizing.