The slide that doesn't exist

Every pitch deck guide teaches the same structure. Purpose. Problem. Solution. Why now. Market size. Competitors. Product. Business model. Team. Financials. Ten slides. I’ve taught this structure myself, in my first book and in dozens of sessions with founders.

There’s an eleventh slide that almost nobody includes.

The meeting that changed how I think about this

Tuesday afternoon, third-floor conference room at a co-working space in Warsaw. A founder sat across from me with a MacBook open and a pitch deck loaded. Revenue was climbing. They were spending heavily on customer acquisition. The dashboard looked healthy. They wanted to talk about scaling.

I asked one question: what’s your Customer Lifetime Value (LTV), and what does it cost you to acquire each customer?

They knew the numbers. Roughly. The numbers were buried on slide 9 of their deck, in a table of financial projections between revenue forecasts and headcount plans. Small font. No chart. Just rows of numbers that assumed you’d do the math yourself.

We did something simple. We plotted those two numbers against each other on a chart. LTV on one axis. Customer Acquisition Cost (CAC) on the other.

Nobody spoke for a few seconds.

Their LTV was low. Their CAC was high.

Every new customer they acquired looked like growth on the revenue line but was actually a small financial loss disguised as progress. The company was growing its way into bankruptcy, and the pitch deck was helping it do so by hiding the evidence in a table nobody read carefully.

They didn’t have a growth engine. They had a cash bonfire with a nice dashboard on top.

Nobody had told them. Because nobody had asked them to put those two numbers on their own slide, where they couldn’t hide.

I’ve lived this math myself

You know the PizzaPortal math from the Preface. PLN 100 in, PLN 2.40 back per order. Try walking into a room full of investors with those numbers.

The only way that conversation works is if you can show retention by cohort and ordering frequency by month, with a trend line that proves customers stick around. We could show that. We had the data broken down by city and by acquisition channel.

And we learned something I still carry with me: when you present unit economics clearly, the entire dynamic of the investor meeting shifts. The investor stops poking holes in your vision and starts pressure-testing your assumptions. Instead of defending a dream, you’re debating the mechanics of a business.

That pitch worked because we forced ourselves to understand the math before we walked in.

In one country, we were spending €45 to get a customer who only ordered once. Their value? Maybe €3. That kind of number is painful to write on a slide. But if we hadn’t written it, we would have kept spending. The slide forced the conversation. The conversation forced the fix. We killed that channel within a week.

What this looks like from the investor side

Later, on the investor side of the table, I started noticing how rare that kind of clarity was. Most founders bury unit economics on slide 9 in a font size nobody can read. Some don’t include them at all. The numbers only come out when an investor asks directly, and by that point the founder is improvising, pulling figures from memory that don’t quite match the spreadsheet back at the office.

That’s the kind of moment that makes or breaks a funding round. Not the TAM slide. Not the “we only need 1% of the market” logic. The real question is simple: do you earn more from a customer than it costs to get them, and how long does that take?

Two numbers. LTV and CAC.

Every investor I respect evaluates them, whether you present them clearly or not. I’ve sat in rooms where a founder finished a 20-minute presentation and the first question from the lead partner was: “What’s your CAC by channel?” The founder froze. They had a blended number somewhere. They couldn’t break it down. The meeting was effectively over. Not because the answer would have been bad, but because not knowing the answer told the investor everything they needed to know about how deeply the founder understood their own business.

I’ve also sat in rooms where the opposite happened. A founder at the seed stage, pre-product-market fit, put up a slide that showed their CAC at €38 on paid social and €12 through referrals. Their estimated LTV was €95, based on four months of cohort data. The numbers were early and messy. But the slide existed. The founder could walk through every assumption and explain what she was testing to improve the ratio. The lead partner leaned forward. The meeting ran 20 minutes over. She received a term sheet within two weeks.

The numbers were not perfect. They did not need to be perfect. What mattered was that the founder clearly understood the machine she was building and could explain what levers she was pulling. That kind of fluency is impossible to fake. It comes from staring at the numbers weekly and making decisions based on what they show you. Every week, this founder updated the slide with new data. Her CAC was dropping, her LTV was climbing, and she could prove both with cohort charts she built herself.

DocSend’s 2024 analysis found that investors spend an average of 2 minutes and 24 seconds reviewing a startup’s entire deck. Papermark’s 2025 dataset of 3,000 decks confirms the pattern: the slides investors slow down for are business model and traction. LTV and CAC belong on those slides. In most decks, they are either absent or squeezed into a projections table that gets a few seconds of attention.

Here’s what happens when you don’t show them. The investor does the math in their head. Whatever number they come up with will be worse than reality, because they will assume the worst. When you present them on their own slide, plotted against each other, the investor stops guessing and starts working with your numbers.

The ratio that lied

A founder once came to me absolutely certain their company was printing money. CAC was €25. LTV was €150. The ratio looked like a dream: six to one. They were preparing to triple their ad spend.

We removed the averages.

Half of their customers had bought once and disappeared. On paid channels, the real lifetime value was closer to €40. The moment we segmented by acquisition source, the entire story collapsed. Their organic customers loved the product and kept buying for months. Their paid customers tried it once and left. Averaged together, the business looked healthy. Separated, the paid acquisition channel was a money pit.

Scaling wouldn’t multiply profits. It would multiply losses.

I see this pattern in every vertical. A SaaS company shows me 4:1 overall. I ask them to split by channel. Google Ads: 1.8:1. Content marketing: 9:1. Partnerships: 6:1. The winning channels were carrying a loser, and the blended number made that loser invisible. The moment they scaled ad spend, the ratio would have collapsed toward 2:1. They would have burned through their raise in months wondering why the math stopped working.

If they had built one slide with LTV and CAC plotted by channel, the problem would have been visible in seconds. Instead, it was hidden in a spreadsheet that told a flattering story.

The founder who showed me the 6:1 ratio? We spent an hour together, rebuilding the numbers by channel. By the end, he had a very different picture of his business. Two channels were profitable. One was a disaster. He cut the disaster that afternoon and redirected the budget. His overall ratio dropped from 6:1 to 3.8:1, but for the first time, it was a real number. A number he could actually scale on.

When the calculation itself is wrong

I talked to a founder last year who had raised a seed round of €2 million. She was smart, her product had early traction. I asked her for her LTV:CAC ratio. She said “about 5:1.” I asked how she calculated LTV. She said, “Average revenue per customer times twelve months.” I asked why twelve months. She said her mentor had told her to use twelve months as a default.

Her actual median customer lifespan was four months. Her real LTV:CAC ratio was closer to 1.7:1, and she was about to commit half her raise to paid acquisition based on numbers that were off by a factor of three.

This is what happens when founders treat LTV as a formula to fill in rather than a number to earn. The twelve-month assumption is one of the most common mistakes I see. Founders plug in a time horizon that feels reasonable, instead of measuring how long customers actually stay. The gap between the assumed LTV and the real one can be large enough to bankrupt a company.

Another version of this mistake: using revenue instead of contribution margin. A founder tells me their average customer spends €200 per year. I ask about delivery costs, support costs, payment processing. After subtracting those, the actual contribution per customer is €80. The LTV they’ve been showing investors is 2.5 times higher than reality. They’ve built their entire growth plan on a number that doesn’t exist.

I once asked a founder how they calculated CAC. They divided total marketing spend by total new customers. Sounds correct. But half of their marketing spend was brand building: podcast sponsorships, conference booths, a PR agency retainer. Those costs were real, but they didn’t map to specific customer acquisition. Meanwhile, their Google Ads were generating 80% of trackable signups at a cost they had never isolated. They had no idea what it actually cost to acquire a paying customer through any single channel. Their “CAC” was a number that described nothing.

And because pitch deck templates are designed around storytelling (problem, solution, market, traction), LTV and CAC get buried in a financial table. Mentioned in passing on a projections slide. Never given their own space. The standard ten-slide structure doesn’t have a home for them. So they become homeless metrics, drifting between slides, belonging to none.

That’s the blind spot. Not ignorance. Misplacement.

LTV and CAC don’t belong on your financials slide. They deserve their own slide. One that shows, in a single image, where your business actually stands.

The Growth Map

I’ve spent years using a simple visual with founders and boards. Put LTV on the vertical axis. Put CAC on the horizontal axis. Plot your position. That single dot on the Growth Map is more honest than most board decks.

What you see is one of four quadrants.

Star (High LTV, Low CAC). Customers are valuable and cheap to acquire. This is where you want to be. Scale hard. Don’t get complacent, because competitors will try to push you out.

Trap (High CAC, Low LTV). This is where that first founder was sitting when we plotted their numbers. Every new customer looks like progress but bleeds cash. Most startups that die from “running out of money” are actually dying here. Fix retention or pricing before spending another euro on acquisition.

Burn (High LTV, High CAC). Your product is valuable but expensive to sell. Common in enterprise sales and high-ticket products. At SunRoof, we lived here. Solar roofs have long sales cycles and high acquisition costs, but each customer was worth tens of thousands of euros over the lifetime of the product. The strategic question was always about reducing acquisition cost without cheapening the product or shortening the sales process in ways that would lose qualified buyers.

Bootstrap (Low LTV, Low CAC). Thin margins, but you can survive. The path forward is increasing monetization through upsells or moving into higher-value customer segments.

The founder from my opening story? Once they saw they were in the Trap, the entire conversation changed. We stopped talking about scaling and started talking about retention. They redesigned their onboarding flow and adjusted their pricing tiers. They stopped acquiring new customers for six weeks and put every resource into keeping the ones they had. Nine months later, their LTV to CAC ratio moved from 2.4 to 4.1. Same team. Same budget. The only thing that changed was where the team pointed its effort.

That change happened because they built one slide and stared at it.

Very often, founders assume they know what quadrant they’re in. They don’t. I’ve watched companies that thought they were in the Star discover they were actually in the Burn once they calculated CAC properly. I’ve seen Bootstrap companies realize they were closer to the Trap than they thought, because they were underestimating how much they spent on sales. The Growth Map only works if the inputs are honest. Which is why the calculation matters as much as the visual. And that calculation is where most founders go wrong.

What belongs on the slide

The Two Numbers Slide is simple. Two axes. Four quadrants. Your position.

It takes five minutes if you know your numbers. If it takes longer than five minutes, that tells you something: you don’t know your numbers well enough. And that’s the most valuable thing this exercise will teach you.

Don’t use blended averages. Plot by channel. Plot by customer segment. If your Facebook ads acquisition and your organic word-of-mouth land in different quadrants, that’s not a problem with the Growth Map. That’s the Growth Map showing you where your money is being wasted and where your actual growth engine lives.

Here’s what the slide should contain: your LTV and CAC by acquisition channel, your position on the Growth Map, your current LTV:CAC ratio, and your payback period. If you can add a second dot showing where you were six months ago, even better. Investors want to see direction.

The deck with the Two Numbers Slide gets a different kind of attention. Not because the numbers are always good. Because the founder who shows them is the founder who actually understands the business.

When I advise founders today, that they should try to build this slide. Before the pitch deck. Before the financial model. Just plot where you are. If you’re in the Star, we talk about scaling. If you’re in the Trap, we talk about survival. The conversation starts from reality, not from hope.

The red flag underneath all the other red flags

My most engaged LinkedIn post was about red flags that make investors walk away. Big vision with no strategy. “We only need 1% of the market” logic. Numbers that don’t match across slides. No mention of unit economics.

But the red flag underneath all of those is this: the founder doesn’t know their unit economics cold.

The vague use of funds. The inconsistent assumptions. Most of these problems trace back to one thing: the founder hasn’t put LTV and CAC on their own slide and stared at what the numbers actually say.

The same DocSend data shows investors spent 19% less time on market size slides and 48% less time on competition slides compared to the prior year, while spending 40% more time on team slides at the seed stage. Attention is moving away from the story of the opportunity and toward the evidence of the business. Stop selling the size of the market and start showing the economics of the machine.

If you know your LTV and CAC by channel, by cohort, by customer type, you can answer almost any question an investor asks. Because those two numbers are the DNA of your business model.

I’ve built a free tool at ltvcacbook.com/slidebuilder that does the math for you and exports a ready-made slide. But before we get to the tool, you need to understand the numbers that go into it.

How do you calculate these numbers correctly? And where does the math go wrong in ways that cost founders their companies?

Open your pitch deck right now. Count the slides. If there isn’t one with LTV on one axis and CAC on the other, your investors are doing that math without you. And they’re assuming the worst.

Build the slide. Put the real numbers on it. If the numbers scare you, good. That fear is worth more than another quarter of spending blind.

Let’s define the numbers that go on that slide.