How to Make the Market Slide of your Pitch Deck [Guide + Example]
- Ink Narrates | The Presentation Design Agency
- Feb 19, 2023
- 8 min read
Updated: Jan 29
While working on a pitch deck for one of our clients Liam, he asked us a question that stopped the room:
“How do we show a market size slide that actually feels credible, not just big for the sake of big?”
Our Creative Director responded:
“By showing numbers that are real, relevant, and rooted in logic.”
As a presentation design agency, we work on dozens of market size slides every year. And in the process, we’ve noticed one recurring challenge: founders either exaggerate the numbers or water them down because they don’t know how to estimate them properly.
So, in this blog, we’ll talk about how to actually make your market slide convincing, clean, and investor ready.
In case you didn't know, we specialize in only one thing: making pitch decks. We can help you by designing your slides and writing your content too.
What’s the Role of a Market Slide in a Pitch Deck
The market size slide does one thing, very clearly: It answers the question, “Is this opportunity worth betting on?”
If your pitch deck is a story, then the market size slide is the scene where investors sit up and decide if they care enough to keep watching. It’s not about throwing around the biggest number you can Google. It’s about context. Relevance. And most importantly, scale that makes sense for your business model.
This slide plays three key roles in your deck...
It sets the stakes.
You could have a genius product, but if the total market size is tiny, it’s a capped story. On the flip side, if the market is massive, but you haven’t clarified your slice of it, the story falls apart. The market size slide is where you define the playground and your position in it.
It builds credibility.
How you arrive at your numbers shows how you think. VCs aren’t just looking at the final figure, they’re evaluating the logic behind it. A thoughtful breakdown shows you’ve done your homework and understand your competitive landscape. A lazy number (especially a top-down “$500B industry!” kind of number) feels like noise.
It justifies ambition.
Planning to raise millions? Planning to scale globally? Your market size slide needs to back that up. Otherwise, your ask sounds inflated. The numbers need to support the story you’re telling about growth, potential, and scale.
So, no. This isn’t just a filler slide sandwiched between your problem statement and solution. The market size slide tells investors whether your idea is even worth a second look.
How to Make a Convincing Market Slide
Let’s skip the fluff. If you’re putting together a market size slide, your job is to show investors three things:
How big the opportunity is.
Where your business fits into that opportunity.
How you calculated those numbers.
Do that well, and your slide builds trust. Miss the mark, and everything else you say gets a lot harder to believe.
We’ve built enough pitch decks to know that there’s a right way to do this, and a bunch of wrong ones. So, here’s how to get it right.
First: Know the 3 Layers of Market Sizing (TAM, SAM, SOM)
You’ve probably heard of TAM, SAM, and SOM. But let’s clarify what they actually mean, and how to use them without sounding like you copy-pasted from a startup blog.
TAM (Total Addressable Market): This is the total demand for your product or service in the world, assuming no limits. Think of it as the universe of people or businesses that could ever buy what you’re offering.
Example: If you’re building a project management tool, the TAM might be the global productivity software market.
SAM (Serviceable Available Market): This is the part of the TAM you can actually serve based on your product features, geography, language, regulations, etc. Basically, it’s the chunk of the universe that you’re able to reach right now.
Example: If your tool is only in English and geared toward remote tech teams, your SAM is significantly smaller than the full productivity software market.
SOM (Serviceable Obtainable Market): This is the percentage of SAM you can realistically capture in the short-to-medium term. It’s your starting point. The slice of the pie you’re aiming to own first.
Example: Based on your pricing, marketing strategy, and resources, maybe you can reach 2% of that remote-tech-team segment in your first few years. That’s your SOM.
Use this structure on your slide if it fits your model. It shows strategic thinking and makes your numbers more believable. But don’t force-fit it. If your business doesn’t map cleanly to TAM-SAM-SOM, we’d rather you show one strong, well-justified number than three weak ones.
Second: Choose Your Approach (Top-Down or Bottom-Up)
There are two ways to estimate market size, and they serve very different purposes. The biggest mistake we, see? Founders mix both and confuse their audience.
Top-Down: This is when you start with a big industry number and narrow it down. It usually goes something like:
“The global travel market is $2 trillion. We’re targeting solo travelers. That’s about 20% of the market. So, our TAM is $400 billion.”
This sounds big and exciting, but it’s also vague. Investors will immediately ask: Where did you get that 20% from? If you can’t defend it, the whole number collapses.
Top-down works when:
You’re entering a well-established industry with solid data.
You clearly explain how you filtered the total market.
You’re showing broad potential — not your actual early-stage plan.
Bottom-Up: This is the approach investors respect more — especially at early stages. You start with real data: your pricing, your target users, your sales funnel.
“We’re targeting 50,000 remote-first tech startups in the US. Our average deal size is $6,000/year. If we capture 10% of that market in five years, that’s a $30M SOM.”
It’s grounded. It’s practical. And it shows that you’ve thought this through. If you’ve launched already, even with a small pilot, use your real metrics. Nothing beats showing traction and using it to back into a market size.
Bottom-up works when:
You have some early customer data.
You’re in a niche or new market.
You want to show how you’ll scale.
Our take? Use bottom-up if you can. If you use top-down, back it up with logic — not just hope.
Third: Use Actual Numbers, Not Fluffy Ranges
We’ve seen too many slides with lines like:
“The wellness market is between $1 trillion and $4 trillion.”
That’s not helpful. You just gave your investor a 300% range to work with. It screams “I googled this at 2 AM and didn’t double-check it.”
Stick to one number per category (TAM, SAM, SOM). Cite your sources. If you need to explain assumptions, do it briefly below the number or in the speaker notes.
Better still, build a quick table. Investors love seeing inputs:
Metric | Value |
Target customers | 40,000 remote startups |
Avg spend per year | $5,000 |
Realistic capture (10%) | 4,000 customers |
Estimated revenue | $20 million |
Now your number has legs. It’s not just a claim. It’s a calculation.
Fourth: Visuals Matter More Than You Think
This is where most founders miss the point. You’re not just showing a number, you’re telling a story. The market size slide has to be visually digestible in 5 seconds.
Here’s what works:
Circles or pie charts to show TAM > SAM > SOM.
Clean bar graphs to compare segments or growth.
Simple icon + number layout to show inputs (like in the table above).
What doesn’t work:
Walls of text.
Screenshots of Statista charts with tiny fonts.
Spaghetti pie charts with eight slices no one asked for.
Design is persuasion. A well-designed market size slide says, “We care about clarity.” That speaks louder than any investor jargon.
Fifth: Avoid These Rookie Mistakes
Let’s call them out, because we’ve seen them all.
1. Making the market sound way too big.
If your slide says your TAM is $900 billion but you’re building a note-taking app, expect eye-rolls. Big numbers don’t impress anyone unless they’re believable.
2. Confusing revenue with market size.
Market size is about demand, not your revenue target. Saying “Our TAM is $50M because that’s what we want to make” is backwards.
3. Citing bad or outdated sources.
Google isn’t a source. Always go to the original report or dataset. Use Statista, McKinsey, IBISWorld, or credible government and industry reports. Put the source in small font. It builds trust.
4. Ignoring competition.
If your market is already crowded, saying “We’ll just take 10%” doesn’t hold up. Explain why you can win that slice.
5. Using the same number as 10 other decks.
Investors see patterns. If you copy-paste the same stat as every other AI startup, they’ll notice. Customize it. Always.
Example of a Pitch Deck Market Slide
We’ve chosen a simple example from one of our projects instead of a complex one. This is for a fashion brand operating in the sustainable fashion space. If you can’t go deep into complexity or don’t have primary data or original research to showcase, focus on industry growth using CAGR and clearly present TAM, SAM, and SOM.
Where Should You Place the Market Size Slide in Your Pitch Deck
The market size slide usually works best after the problem slide and your solution slide. Once investors understand what you’re building and why it matters, they naturally want to know how big the opportunity is. Placing the market size slide too early, before context is established, makes the numbers feel abstract and disconnected.
In most pitch decks, the ideal spot is right after the solution or product slide and before traction slide or business model slide. At this point, the market size helps frame the upside and sets expectations for scale, making the rest of the deck easier to evaluate.
3 Simple Rules for Citing Sources in Your Market Size Slide
Rule 1: Use credible, recognizable sources
Stick to well-known industry reports, government data, or established research firms. Investors care less about perfect numbers and more about whether the source is trustworthy. If the source is obscure or unclear, the numbers lose credibility no matter how impressive they look.
Rule 2: Be specific, not vague
Always mention where the data comes from and, if possible, the year it was published. Avoid generic lines like “industry research” or “market reports.” Clear attribution shows you’ve done real homework and allows investors to understand the context behind the numbers.
Rule 3: Match the source to the claim
Use broad industry reports for TAM, but justify SAM and SOM with logic tied to your product, geography, or target customer. The closer the number is to your actual business, the more reasoning and explanation it should have behind it.
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