TAM (Total Addressable Market) is the total market demand for your product. SAM (Serviceable Available Market) is the segment of TAM you can serve based on your product and geography. SOM (Serviceable Obtainable Market) is the realistic portion of SAM you can capture. These three metrics help you size your market opportunity and connect directly to your ICP strategy.

How do you calculate TAM SAM SOM?

Calculate TAM by multiplying the number of target accounts by your Average Contract Value (ACV). Calculate SAM by multiplying TAM by the percentage of accounts you can actually serve (based on geography, product fit). Calculate SOM by multiplying SAM by your realistic market share percentage. Your SOM should align with your Initial Customer Profile—the subset of your ICP that gets you to your next revenue milestone.

How does TAM SAM SOM connect to ICP?

Your Ideal Customer Profile (ICP) maps directly to your SAM—it's the specific segment of the total market you're carving out based on firmographics, triggers, and macro trends. Your Initial Customer Profile (the subset that gets you to your next milestone) maps to your SOM. Understanding this connection helps you focus resources and build a realistic path to growth.

TAM SAM SOM Calculator - Free B2B SaaS Market Sizing Tool

Q: What is TAM (Total Addressable Market)?

TAM or Total Addressable Market represents the total revenue opportunity available if your product achieved 100% market share. It's the maximum potential size of the market for your product or service. For B2B SaaS, TAM is typically calculated by multiplying the total number of potential customers by your average contract value (ACV).

Q: What is SAM (Serviceable Available Market)?

SAM or Serviceable Available Market is the portion of TAM that your company can realistically serve based on your product capabilities, geographic reach, and business model. SAM represents your target market segment and maps directly to your Ideal Customer Profile (ICP).

Q: What is SOM (Serviceable Obtainable Market)?

SOM or Serviceable Obtainable Market is the portion of SAM that you can realistically capture in the near term, typically 1-3 years. SOM accounts for competition, market penetration rates, and sales capacity. This maps to your Initial Customer Profile—the subset of customers that will get you to your next revenue milestone.

Calculate Your Market Size

Enter your numbers to see your TAM, SAM, and SOM instantly.

Number of Target Accounts

Companies fitting your ICP firmographics

Average Contract Value (ACV)

Annual contract value in dollars

% of Accounts You Can Serve

Geographic/product limitations → SAM

% Realistic Market Share

Near-term capture rate → SOM

TAM (Total Addressable Market)

$250,000,000

Everyone you could sell to

SAM / Your ICP Segment

$125,000,000

Your ideal customer segment

SOM / Initial Customer Profile

$12,500,000

Your realistic near-term capture

What is TAM SAM SOM?

TAM, SAM, and SOM are three metrics that help B2B SaaS founders understand and communicate their market opportunity. Understanding these metrics is essential for fundraising, strategic planning, and connecting your market size to your Ideal Customer Profile (ICP).

What is TAM (Total Addressable Market)?

TAM (Total Addressable Market) represents the total revenue opportunity available if your product achieved 100% market share. It's the maximum potential size of the market for your product or service.

TAM Formula: Number of Target Accounts × Average Contract Value (ACV)

Key principle: Start with an existing market where money is already being spent. Don't try to create a new market—find where dollars are flowing today.

What is SAM (Serviceable Available Market)?

SAM (Serviceable Available Market) is the portion of TAM that your company can realistically serve based on your product capabilities, geographic reach, and business model.

SAM Formula: TAM × % of Accounts You Can Serve

ICP Connection: Your SAM maps directly to your Ideal Customer Profile (ICP)—it's the specific segment you carve out based on firmographics, triggers, and macro trends.

What is SOM (Serviceable Obtainable Market)?

SOM (Serviceable Obtainable Market) is the portion of SAM that you can realistically capture in the near term, typically 1-3 years. SOM accounts for competition, market penetration rates, and sales capacity.

SOM Formula: SAM × % Realistic Market Share

ICP Connection: Your SOM maps to your Initial Customer Profile—the subset of your ICP that gets you to your next revenue milestone.

Key Takeaway

"Your ICP doesn't exist in a vacuum—it lives within your market sizing framework. Start with your TAM: an existing market where money is already being spent. Your SAM is the segment you carve out based on your product and reach—this is where your ICP lives. Your SOM is your realistic near-term capture—this is your Initial Customer Profile."

Watch: How to Calculate TAM

In this video, TK Kader explains the 3 principles you need to know about Total Addressable Market and how to connect TAM to your ICP strategy.

TAM vs SAM vs SOM: How They Connect to Your ICP

Metric	Definition	ICP Connection
TAM	Total Addressable Market—everyone who could theoretically buy	Start with an existing market where money is already being spent
SAM	Serviceable Available Market—segment you can actually serve	Maps to your ICP—the specific segment you carve out
SOM	Serviceable Obtainable Market—realistic near-term capture	Maps to your Initial Customer Profile—gets you to next milestone

Key insight: Your SOM should align with your Initial Customer Profile. Start with your Initial Customer Profile (the subset that gets you from $100K to $1M ARR), expand to your full ICP (SAM), then work toward dominating your TAM. This shows investors you have discipline and a realistic path to growth.

Frequently Asked Questions

What is TAM SAM SOM?: TAM (Total Addressable Market) is the total market demand for your product. SAM (Serviceable Available Market) is the segment of TAM you can serve based on your product and geography. SOM (Serviceable Obtainable Market) is the realistic portion of SAM you can capture. These three metrics help you size your market opportunity and connect directly to your ICP strategy.
How do you calculate TAM SAM SOM?: Calculate TAM by multiplying the number of target accounts by your Average Contract Value (ACV). Calculate SAM by multiplying TAM by the percentage of accounts you can actually serve. Calculate SOM by multiplying SAM by your realistic market share percentage. Your SOM should align with your Initial Customer Profile.
How does TAM SAM SOM connect to ICP?: Your Ideal Customer Profile (ICP) maps directly to your SAM—it's the specific segment of the total market you're carving out. Your Initial Customer Profile (the subset that gets you to your next milestone) maps to your SOM. Understanding this connection helps you focus resources and build a realistic path to growth.
Why is TAM SAM SOM important for fundraising?: Investors use TAM SAM SOM to evaluate whether your market opportunity is large enough to generate venture-scale returns. More importantly, showing a realistic SOM demonstrates that you understand your near-term opportunity and have discipline in your go-to-market approach.
What's a good SOM percentage?: A realistic SOM is typically 1-5% of your SAM for early-stage companies. Be honest about your near-term capture rate based on competition, sales capacity, and market penetration. Overly optimistic SOM projections signal inexperience to investors.

Ready to Build Your Unstoppable ICP?

Now that you've sized your market, learn how to build a 3-part Ideal Customer Profile that connects Firmographics, Triggers, and Macro Trends. Read the full ICP Guide.