How to Visualize Market Size (TAM, SAM, SOM) in a Google Slides Pitch Deck Using a Nested Donut Chart

April 10, 2026

You are exactly three minutes into your pitch. The investors are nodding. You've hooked them with the problem and wowed them with your solution.

Then you click to the "Market Size" slide.

If they see three boring bullet points throwing around arbitrary billions, you've just lost their attention. Investors don't just want to see huge numbers; they want to see that you understand the realistic boundaries of your market.

That is exactly why the TAM, SAM, and SOM framework exists. But explaining it in text is clunky. Visualizing it? That's where you win the room.

Today, I'm going to show you how to visualize your market size perfectly using a nested donut chart right inside your Google Slides pitch deck.

Why a Nested Donut Chart Works Best

First, let's quickly break down the acronyms:

  • TAM (Total Addressable Market): The entire universe of your market. The absolute maximum revenue if you achieved 100% market share.
  • SAM (Serviceable Addressable Market): The portion of the TAM that fits your specific product and business model.
  • SOM (Serviceable Obtainable Market): The realistic slice of the SAM you can capture in the next 1-3 years.

When you use a nested donut chart—essentially rings sitting inside one another—the viewer instantly grasps the relationship between these three metrics. The massive outer ring is the TAM. The middle ring is the SAM. The core inside is your SOM.

It visually proves that your short-term goals (SOM) are realistic while teasing the massive upside (TAM) if things go perfectly.

The Google Slides Problem

If you've ever tried building a nested donut chart using the default Google Slides tools, you already know the headache.

Native Slides doesn't offer a clean, out-of-the-box nested donut. You end up awkwardly layering circle shapes over one another, manually trying to align the centers. And heaven forbid your data changes right before the pitch—you have to delete the shapes and start drawing all over again.

You need a professional data visualization tool, but you shouldn't have to leave your presentation to use one.

The Fix: Building it with ExtraChart

Instead of fighting with manual shapes, we use ExtraChart. It's an add-on that sits right inside your Google Slides sidebar and handles the heavy lifting for you.

Here is exactly how to build your market size slide.

1. Launch the Sidebar

Open your pitch deck. Head up to Extensions -> ExtraChart -> Create & Edit Charts. The ExtraChart sidebar will slide open directly next to your presentation.

2. Select Your Donut Chart

Scroll through the categorized list of charts. Under the "Pie & Donut Charts" section, you'll spot the Donut Chart icon. Click it to open the real-time editor popup.

Sidebar menu: Selecting the Donut Chart icon

3. Drop in Your Market Data

In the editor's Data tab, you'll see a simple, spreadsheet-like interface. Delete the sample data and type in your TAM, SAM, and SOM values. Because ExtraChart updates the preview in real-time, you'll see the chart take shape immediately as you type. No guessing.

4. Customize for Impact

A great pitch deck slide is clean and focused. Jump over to the Settings tab in ExtraChart to make it pop:

  • Adjust the Inner Radius: Tweak the slider so your rings have the perfect thickness.
  • Nail the Colors: Use ExtraChart's Color Palette Manager to apply a monochromatic theme. A pro tip: Make the TAM a very light shade of your brand color, the SAM a medium shade, and your SOM a bold, dark, high-contrast color. This naturally draws the investor's eye to the exact market you are attacking first.
  • Clean up the Legend: Position your legend cleanly at the bottom or turn it off entirely and use text boxes on your slide to point directly to the rings.

5. Insert and Update

Click "Create." ExtraChart drops a crisp, high-resolution image of your new nested donut chart perfectly onto your active slide.

The best part? If your co-founder texts you ten minutes before the meeting to say, "Actually, our SOM is $15M, not $12M," you don't panic. Just click the chart on your slide, re-open ExtraChart, and change the number. The add-on remembers your settings and updates the chart instantly.

Stop Settling for Ugly Pitch Decks

Your market size is too important to leave to bullet points or messy, hand-drawn circles. A nested donut chart communicates proportion, realism, and ambition all in a single glance.

Stop wrestling with default presentation tools. Map your TAM, SAM, and SOM the right way, and keep the investors focused on what actually matters: your growth.