CTV CPM Explained for Law Firms

CPM, or cost per mille (thousand impressions), is the standard pricing unit for CTV advertising. Understanding how CPMs work helps you evaluate proposals, compare options, and budget effectively. The CTV budget by market size guide shows how these CPMs translate into real monthly spend.

It’s also the wrong number to fixate on.

What CPM Actually Means

CPM stands for cost per mille. Latin for thousand. You’re paying for 1,000 ad deliveries to 1,000 households.

The math is simple. At a $35 CPM, $50,000 buys you roughly 1.43 million impressions. At $25 CPM, the same budget gets 2 million. Those numbers feel meaningful until you ask a harder question: how many of those impressions reached someone who might actually hire a PI attorney?

That’s where CPM falls apart as a standalone metric. Our breakdown of CTV advertising costs for law firms covers the full picture beyond just CPM.

What You’ll Actually Pay in 2026

The CTV pricing landscape shifted dramatically over the past 18 months. Amazon added approximately 50 billion ad impressions to the US market when it launched Prime Video ads. Netflix, Disney+, and Paramount+ all expanded ad tiers. Supply went up. Prices came down.

Inventory	CPM Range	What You’re Getting
Netflix (direct buy)	$45-65	Premium content, limited targeting options
Hulu	$30-60	Strong content, good targeting, high completion
Amazon Prime Video	$25-60	Retail data targeting, massive scale
Peacock (programmatic)	$15-35	NBC content, NFL Sunday Night Football
YouTube CTV	$20-25	TV screen placements via Google’s ecosystem
Paramount+ (self-serve)	$7-15	Lowest barrier to entry in premium CTV
Tubi, Pluto TV	$15-25	100M+ monthly users, FAST inventory

Two years ago, blended law firm campaigns ran $35-45 CPM. In 2026, programmatic buys are settling closer to $25-35. That 20-30% reduction happened because inventory grew faster than demand. The shift from broadcast to streaming TV advertising is accelerating this trend.

The Direct vs. Resold Gap

Where you buy matters more than what you buy.

Marketing Architects found a 39% price gap between direct auction inventory and resold inventory. The median direct CPM was $14. Resold ran $19.50. Same impressions, different middlemen.

On a $50K/month campaign, that gap costs roughly $14,000 a year. For identical reach. Ask every vendor where their inventory originates. If they can’t answer clearly, you’re probably paying the markup.

Why CPM Alone Lies

Here’s an exercise that changes how every PI firm thinks about CTV pricing.

Channel	CPM	Relevance Rate	Effective CPM
Broadcast TV	$15	8% of viewers might need a lawyer	$188
Basic CTV	$30	15% with demographic targeting	$200
Targeted CTV	$45	28% with behavioral + intent data	$161

The most expensive CPM delivers the cheapest effective cost per relevant impression. Broadcast’s $15 sticker price is a mirage. You’re paying to reach households that don’t own cars, weren’t in accidents, and don’t live in your service area.

Targeted CTV at $45 puts your ad in front of households that match your actual client profile. The waste drops. The effective cost drops with it.

Cost Per Completed View: The Better Metric

CPM measures delivery. CPCV measures consumption. On CTV, that distinction barely matters because 95% of viewers watch the whole ad. But compare it to other channels and the gap is massive.

Less than two cents for someone to watch your entire 30-second spot in their living room. On their big screen. With sound on. Not scrolling past a muted autoplay on their phone.

For a PI firm where the message needs to land (“Injured? Call us. We don’t get paid unless you do.”), completion rate matters more than any CPM comparison.

Seasonal CPM Swings

CTV pricing isn’t static. It moves with demand.

Q4 is the expensive quarter. Holiday retail advertisers flood the market. Political campaigns (in election years) can spike CPMs 40-60% in battleground states. Even non-battleground markets see 20-30% increases from political spend alone.

Q1 is the bargain quarter. Post-holiday pullback means less competition for inventory. January and February often deliver the lowest CPMs of the year. For PI firms, this is a gift. Car accidents spike in winter weather. Your audience is watching more TV. And you’re paying less to reach them.

How to Evaluate a CPM Proposal

When a vendor puts a CPM number in front of you, ask five questions before reacting to the price.

What Good Value Looks Like

Not every low CPM is a bargain. Not every high CPM is a rip-off.

Signal	Red Flag	Good Sign
CPM	Under $15 (probably junk inventory)	$25-50 for quality mix
Completion rate	Below 85%	Above 94%
Targeting	Demographics only (age/gender)	Behavioral + intent + geographic
Attribution	”We’ll send you a report”	Verified visits, call tracking, pixel data
Transparency	Won’t share placement logs	Full reporting on apps and shows

CTV campaigns deliver 23% higher ROI than traditional TV. But only when CPM represents quality inventory with proper attribution. For the full cost picture, see how much CTV advertising costs for law firms.