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TAM SAM SOM Calculator
Size your market bottom-up: total addressable, serviceable available and serviceable obtainable. Get a one-paragraph market sentence for your application and deck.
TAM
$1.20B
Total addressable market
SAM
$240.0M
Serviceable available
SOM
$7.2M
3,000 customers
Your market paragraph
There are 500,000 mid-market SaaS finance teams worldwide. At $2,400 per year that's a $1.20B market. We can serve 20% of it today ($240.0M), and we expect to win 3% of that within three years — 3,000 customers and $7.2M in revenue.
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Next step
Point this market at a real YC thesis
The Request for Startups lists the categories YC partners actively want. Match your market to one and the application writes itself.
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How to use this tool
Step 1
Describe the customer
Be specific — 'mid-market SaaS finance teams', not 'businesses'.
Step 2
Count them and price them
Use a defensible customer count and the annual price you can actually charge.
Step 3
Narrow twice
SAM is who you can serve now; SOM is who you can win in three years.
Step 4
Copy the sentence
Paste the generated paragraph into your application or deck.
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FAQ
How do you calculate TAM, SAM and SOM?
TAM = total customers in the market × annual revenue per customer. SAM = the slice you can actually serve (geography, segment, regulation). SOM = the share of SAM you can realistically win in three years given your channels and capacity.
What is the difference between TAM, SAM and SOM?
TAM is the whole market, SAM is the part your product can serve today, and SOM is the part you can win near term. TAM sets ambition, SOM sets your plan.
Should I use top-down or bottom-up market sizing?
Bottom-up. Investors discount analyst reports quickly. Counting real customers × real price you can charge is far more credible and it is what YC partners push founders toward in interviews.
How big does TAM need to be for YC?
There is no threshold, but the standard question is whether the company could plausibly become very large. A credible path to $1B+ in annual revenue is the usual bar investors are testing for.
Is this TAM SAM SOM calculator free?
Yes. No signup and nothing is stored.
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