Total Addressable Market / Marketing Terms Total Addressable Market Total Addressable Market (TAM) refers to the overall revenue opportunity available for a product or service if it achieved 100 percent market share. It represents the maximum demand that could exist for a business offering within a specific industry or customer segment. TAM is a foundational concept in market analysis and is often used by startups, investors and strategic planners to estimate growth potential and assess whether an opportunity is worth pursuing. There are several ways to calculate TAM. The top-down approach starts with broad industry data and narrows it down to your specific niche using filters such as geography, target customer or use case. The bottom-up approach builds TAM based on internal data, such as pricing models and target customer volume. There is also a value-theory approach, which estimates TAM by considering how much value your solution creates for the customer and what they might be willing to pay. Each method has strengths depending on your data access and business model. Understanding your TAM helps shape business strategy, product development and investor pitches. A large TAM signals high growth potential, while a small or niche TAM might support a focused, defensible market position. TAM is often discussed alongside Serviceable Available Market (SAM) and Serviceable Obtainable Market (SOM), which further narrow the scope to what your business can realistically serve. Whether you are entering a new market, launching a product or seeking funding, defining your total addressable market helps align your team, justify investments and identify the right opportunities for growth.