Calculate Total Addressable Market
Introduction to Market Sizing
Sizing Up Your Market
Before launching a product or asking for investment, every business needs to answer a fundamental question: How big is the opportunity? This process is called market sizing. It’s about estimating the number of potential customers and the total revenue you could possibly generate. Think of it as drawing a map of your business landscape. It helps you understand the terrain, set realistic goals, and convince others that your venture has potential to grow.
Understanding a company’s Total Addressable Market (TAM) can help investors understand how big a business can grow and what kind of returns a stock can deliver.
To get a clear picture, we break down the market into three distinct, nested categories: TAM, SAM, and SOM. Let's look at each one.
The Whole Pie: TAM
Total Addressable Market (TAM)
noun
The total worldwide demand for a product or service. It represents the maximum revenue opportunity if a business could capture 100% of the market.
The Total Addressable Market (TAM) is the big-picture view. It’s the entire potential market for what you're selling, without any constraints. If you sold your product to every single person who could possibly buy it, anywhere in the world, the revenue you'd generate is your TAM.
Imagine you're opening a pizza shop. Your TAM would be the total amount of money spent on pizza by everyone in the entire world in a year. It's a massive, theoretical number. While you'll never capture all of it, knowing the size of the TAM is crucial. It tells you, and potential investors, the ultimate growth potential of your idea. A large TAM suggests a significant opportunity.
Your Slice: SAM and SOM
No single pizza shop can serve the entire world. You're limited by your location, delivery range, and kitchen capacity. This is where the next two concepts come in.
Serviceable Available Market (SAM) is the segment of the TAM that your products and services can actually reach. It's your target market, narrowed down by factors like geography or specific customer needs.
For your pizza shop, the SAM isn't the whole world; it's the portion of the market within your delivery area. It's the total annual pizza spending of everyone in your city or neighborhood. This is a much more realistic figure that defines the market you can actively compete in.
But you won't capture all of that market, either. You have competitors, and your marketing might not reach everyone. That brings us to our final metric.
Serviceable Obtainable Market (SOM) is the portion of the SAM you can realistically capture. This is your short-term sales target, based on your resources, competition, and strategy.
Your SOM is the share of local pizza sales you believe you can win in the next year or two. It's your piece of the slice. This is the number that informs your immediate business plan, sales goals, and resource allocation.
Together, TAM, SAM, and SOM provide a powerful framework. TAM shows the potential of the ocean, SAM defines your fishing grounds, and SOM sets the target for your first catch. Understanding these three levels helps you build a smarter, more focused business strategy.