# The back-of-envelope toolkit: calculations and due diligence
A streaming executive walks into a pitch meeting with one slide: a napkin sketch showing customer acquisition costcustomer acquisition costCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.Voir la définition complète →, lifetime valuelifetime valueLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.Voir la définition complète →, and a churn curve. No 40-tab spreadsheet. That single slide, done right, tells you more about whether a media deal works than most decks twice its length. This lesson teaches you to build that slide yourself.
Media deals move fast: content windows close, licensing options expire, ad upfronts happen once a year. You rarely have time for a full model before the first gut-check conversation. Professionals in this sector keep five calculations ready in their head, plus a due-diligence checklist for when a real deal appears.
This is not about precision. It is about catching a bad deal in 60 seconds before you spend two weeks building a bad model to confirm it.
CAC (Customer Acquisition Cost): total sales and marketing spend divided by new customers acquired in a period.
LTV (Lifetime Value): average revenue per customer over their expected relationship, minus cost to serve, roughly:
LTV = ARPU x Gross Margin % x Average Customer Lifespan (months)
Where ARPU = Average Revenue Per User (or subscriber), a standard streaming metric.
Worked example: a streaming service spends $30 to acquire a subscriber (marketing plus promo discounts). ARPU is $12/month, gross margingross marginGross margin is the share of revenue left after subtracting the direct cost of producing goods or services, expressed as a percentage of revenue.Voir la définition complète → (after content and delivery costs) is 55%, average subscriber stays 20 months.
LTV = $12 x 0.55 x 20 = $132
LTV:CAC = $132 / $30 ≈ 4.4x
A ratio above 3x is generally considered healthy in subscription businesses; below 1.5x signals a business burning cash to grow. Netflix and Disney+ do not publish CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.Voir la définition complète → directly, but analysts estimate it from marketing spend and net adds disclosed in quarterly filings, so treat any external CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.Voir la définition complète → figure as an estimate.
Content ROI = (Value Generated - Content Cost) / Content Cost
"Value generated" is the hard part: it can be incremental subscribers attributed to a title, hours streamed as a proxy for engagement, or ad revenue for AVOD (Advertising-based Video on Demand) content. Netflix has publicly framed decisions this way, using estimated "hours viewed per dollar spent" as an internal proxy, per reporting from Variety and The Information.
Simple version: a $10 million documentary drives an estimated 200,000 incremental subscriber-months at $12 ARPU and 55% margin = $1.32 million in margin contribution. That alone doesn't cover cost, so the real case rests on retention and brand valuebrand valueThe commercial value your brand adds beyond functional product attributes: the price premium, preference and loyalty it generates.Voir la définition complète →, which is why single-title ROIROIReturn on Investment: the ratio of net profit to the cost of an investment. A 300% ROI means each dollar invested returns $3.Voir la définition complète → is always partial.
Churn rateChurn rateChurn rate is the percentage of customers or revenue lost over a period. It measures how fast a business loses its existing customer base.Voir la définition complète →: percentage of subscribers who cancel in a period (monthly or annual). US streaming churn averages an estimated 4 to 5% monthly across services as of 2025 to 2026, according to data aggregators like Antenna, notably higher than the 1 to 2% typical of pay-TV in its prime.
CAC payback period: months needed for a subscriber's margin contribution to cover acquisition costacquisition costCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.Voir la définition complète →.
Payback = CAC / (ARPU x Gross Margin %)
Using the earlier numbers: $30 / ($12 x 0.55) = 4.5 months
If payback exceeds your average churn-implied lifespan, you are losing money on every subscriber, a red flag common in early-stage streaming launches chasing volume.
CPM (Cost Per Mille/Thousand): cost or revenue per 1,000 ad impressionsimpressionsThe total number of times an ad or piece of content is displayed, regardless of clicks. Each display counts as one impression, even to the same person.Voir la définition complète →. "Blended CPMCPMCost Per Mille: the cost to deliver 1,000 ad impressions. A pricing and benchmarking metric for awareness campaigns where reach matters more than clicks.Voir la définition complète →" averages CPMs across ad formats or platforms.
Blended CPM = Total Ad Revenue / (Total Impressions / 1,000)
US linear TV CPMs are estimated in the $25 to $40 range; connected TV (CTV, meaning streaming devices like Roku or smart TVs) CPMs run higher, often estimated $30 to $50, per industry reporting from eMarketer. Europe generally runs lower CPMs than the US across formats, reflecting smaller, more fragmented ad markets.
Media deals often get sized quickly using a multiple:
Enterprise Value ≈ Revenue x Multiple (or EBITDAEBITDAEBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) measures a company's operating profitability before financing and accounting decisions, used to compare core performance across firms.Voir la définition complète → x Multiple, EBITDAEBITDAEBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) measures a company's operating profitability before financing and accounting decisions, used to compare core performance across firms.Voir la définition complète → meaning Earnings Before Interest, Taxes, Depreciation, and AmortizationEarnings Before Interest, Taxes, Depreciation, and AmortizationEBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) measures a company's operating profitability before financing and accounting decisions, used to compare core performance across firms.Voir la définition complète →)
Streaming and digital media assets have historically traded at estimated 2 to 5x revenue depending on growth rate, while mature cable networks trade closer to 5 to 7x EBITDAEBITDAEBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) measures a company's operating profitability before financing and accounting decisions, used to compare core performance across firms.Voir la définition complète →. These multiples compress and expand significantly with interest rates and platform sentiment, so always treat any single multiple as a rough anchor, not a valuation.
Vérification des acquis
1. What is the primary purpose of back-of-envelope calculations in media deal-making?
2. A subscription business has an LTV:CAC ratio of 1.2x. What does this most likely signal?
3. Why does the lesson caution that externally estimated CAC figures for companies like Netflix should be treated with skepticism?
4. Select ALL correct answers about the components used to calculate Lifetime Value (LTV) in the streaming context.
Sélectionnez toutes les réponses correctes.
5. Select ALL correct answers about why media professionals rely on back-of-envelope calculations rather than always building full models first.
Sélectionnez toutes les réponses correctes.
When a real acquisition or partnership appears, run these checks before the five calculations go into a formal model.
Content rights and windows. Confirm what rights are actually owned versus licensed. A library "worth" $500 million on paper can lose most titles when studio output deals expire. Check territory restrictions: US rights and European rights are frequently split by country or region due to historical distribution deals.
Subscriber quality, not just count. Distinguish paid subscribers from promotional, bundled (e.g., via telecom packages), or free-trial accounts. Bundled subscribers (common in Europe via telco partnerships) often churn faster once the bundle ends.
Regulatory exposure. In the EU, check compliance with the Audiovisual Media Services Directive (AVMSD), which mandates a minimum 30% European content quota in on-demand catalogs. In the US, review any FCC (Federal Communications Commission) ownership rules if broadcast assets are involved.
Talent and union agreements. Confirm residual obligations under agreements like those from SAG-AFTRA (Screen Actors Guild, American Federation of Television and Radio Artists) or the WGA (Writers Guild of America), especially post-2023 strike settlements that changed streaming residual formulas.
Technology and data stack. Can the platform's recommendation engine and billing system migrate, or is the real asset just the brand? Many "streaming acquisitions" are actually content-plus-subscriber-list deals where the tech gets shut down entirely.
Currency and market fragmentation (Europe-specific). A pan-European deal spans multiple currencies, VAT (Value Added Tax) regimes, and consumer protection laws. What looks like one market is often 15.
🎬 [VIDEO: "How Netflix Decides What to Renew or Cancel" - youtube.com - a breakdown of the data signals (hours viewed, completion rate, cost efficiency) streaming platforms use before greenlighting or cutting content]
A quick sanity-check sequence before any pitch or deal memo:
1. Calculate LTVLTVLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.Voir la définition complète →:CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.Voir la définition complète →. Below 2x, ask why.
2. Check payback period against actual churn data, not assumed churn.
3. Sanity-check any content ROIROIReturn on Investment: the ratio of net profit to the cost of an investment. A 300% ROI means each dollar invested returns $3.Voir la définition complète → claim: is "value" revenue, or just engagement hours?
4. Anchor valuation with a rough multiple, then adjust for rights and regulatory risk from the checklist.
5. Flag every regional assumption (Europe is not one market).