The Essential Connection Between Market Size and Business Model Slides in a Startup Pitch Deck

The Market Size Slide gives investors insight into the scope and demand of the opportunity. It answers the question: Is this idea worth pursuing?

Market size assessment helps founders determine if the idea has potential for substantial customer interest and revenue generation. A clear understanding of TAM (Total Addressable Market), SAM (Serviceable Available Market), and SOM (Serviceable Obtainable Market) can show investors that the startup understands its market and has identified a promising segment to capture. With this assessment, founders gain confidence in the idea’s viability, backed by data that demonstrates the market is large, attractive, and has sufficient demand.

Classic Elements of the Market Size Slide

• TAM, SAM, SOM analysis for the startup’s product.
• Highlighting growth rates if the target market is expanding rapidly.
• Additional relevant metrics

A well-researched Market Size Slide tells investors that there is a significant, achievable opportunity with data to back it up.

Underlying Research of Market Size

To put reliable information on this slide, thorough research is essential. Let's take a specific example of a SaaS product designed for automated social media management targeted at small to medium-sized e-commerce businesses to break down the process.

• TAM (Total Addressable Market): The total number of small to medium-sized businesses worldwide that use social media for marketing. For instance, if there are 358 million SMEs globally, and research shows that 71% actively use social media for marketing, the TAM would be approximately 254 million businesses.

• SAM (Serviceable Available Market): Narrow this down by focusing on e-commerce businesses specifically, which are more likely to benefit from automated social media tools. If 10% of these social media-active businesses are e-commerce, the SAM would be 25 million e-commerce businesses. Further refinement could target those that have already adopted digital marketing tools and have a marketing budget over a certain threshold (e.g., spending at least $1,000 per month on digital marketing). Let’s assume this subset is 5% of the e-commerce businesses, resulting in a SAM of 1.25 million e-commerce businesses.

• SOM (Serviceable Obtainable Market): This represents the realistic portion of SAM the SaaS startup can capture in the initial years. Let's say the startup focuses on early adopters actively seeking solutions to automate social media posting and analytics. By targeting aggressive online marketing channels, partnerships, and specialized outbound sales, the startup aims to capture 2% of the SAM within the first five years. Thus, the SOM would be 25,000 e-commerce businesses.

For detailed calculations on market size, trends, and segmentation, you can use this market assessment template, which allows you to structure data and refine estimates by factors like regions and industry segments.

Once the market opportunity is confirmed, founders must answer the question: How will we make money in this market?

The Business Model Slide describes the revenue-generating mechanics of the business and outlines how the company plans to capitalize on the market size previously defined. This slide covers the startup’s main revenue streams, pricing strategy, and potential customer acquisition approach, showing investors that there is a structured plan to monetize the market opportunity.

Classic Elements of the Business Model Slide

• Revenue Streams: Specific ways the company will make money (e.g., one-time sales, subscriptions, advertising, transaction fees).

• Pricing Strategy: The pricing model and specific prices. This helps investors gauge if pricing aligns with customer expectations and willingness to pay.

• Customer Acquisition Strategy: How the startup will attract, convert, and retain customers, including target channels and conversion assumptions. Often, this is presented separately as a “Go to Market Strategy” or Marketing Plan, but projected customer acquisition cost (CAC) and unit economics can also be included here.

When choosing a business model and pricing strategy, it's crucial to develop a financial model that tests various revenue streams, taking into account audience demands, market practices, and competitive environment. For instance, you can explore different revenue streams and sales models using a SaaS financial model template to see which options optimize unit economics and total revenue.

After defining the market size and business model, the final piece is determining if the startup can generate attractive revenue and support profitability within the estimated market share.

The Revenue Projections Slide presents a financial forecast based on the startup’s business model and target market share. This slide relies on a detailed financial model that calculates revenue, expenses, and profit over the next few years, illustrating that the startup can achieve its target SOM within a reasonable timeframe and be profitable.

To prepare this slide, founders need to integrate all costs needed to achieve growth, align the financials with the roadmap, and demonstrate a clear path to achieving the target SOM. Check out my Mobile App Financial Model Template for an example of how to project revenue, costs, and profitability.

Classic Elements of the Revenue Projections Slide

• Revenue Forecasts Over Time: Expected revenue growth over a three- to five-year horizon, based on anticipated market penetration and pricing strategy. Include historical sales data if available.

• Cost and Profit Estimates: Projected costs and expected profit margins. Make your financial projections robust by adding details on estimated profitability, burn rate, and cost structure.

Remember, projected revenue should match the SOM size on the Market Size Slide to show consistency and credibility.

These slides must be interlinked to form a convincing, seamless story.

Market Size Assessment: Founders use market research to assess TAM, SAM, and SOM. This assessment validates that the idea has a lucrative, well-defined market with sufficient demand. The Market Size Slide shows this opportunity, convincing founders and investors of the market’s revenue potential.

Business Model Design: Once the market size is clear, founders create a business model outlining how they’ll generate revenue in this market. This ensures that the business model is robust and suitable for the identified market opportunity.

Financial Modeling and Revenue Projections: Founders then build a financial model to test if the business model can achieve profitability within the market size. This model aligns the business’s revenue potential with SOM estimates, showing investors that the startup can realistically capture market share. Utilize financial model templates to forecast growth and validate your projections.

Revenue Projections in the Pitch Deck: Finally, founders summarize revenue projections in the pitch deck’s Revenue Projections Slide. These projections, based on SOM targets, must match the Market Size Slide and reinforce the Business Model Slide.

By connecting these slides, founders deliver a cohesive narrative: the startup addresses a large, attractive market, has a clear plan for revenue generation, and can realistically achieve its market share and revenue targets. This alignment reassures investors that the startup is not only ambitious but also grounded in solid planning and achievable forecasts.

In this article, I described how I work with my clients and provided screenshots from my financial model templates. Download the financial model templates for the most popular startup types:
Financial Model for Mobile Apps
Financial Model for Subscription | SaaS


Read the guide about financial modeling for a startup on my blog. You can find more articles about finance and business development here.