Billboard vs Car Wrap vs Online Ads: How to Compare the Cost
By Utkarsh Jaiswal · · 2 min read
CPM, cost per month and cost per tracked result: a practical way to compare billboards, car wraps and online ads that each measure themselves differently.
Comparing advertising channels by CPM (cost per thousand impressions) looks scientific. It usually isn't, because each channel counts an "impression" in its own way. Here's a comparison that holds up.
Why CPM comparisons mislead
- Online ads count an impression when the ad loads on a screen, and sometimes only when it's been on screen for a moment. It's measured, but much of it is scrolled past.
- Billboards estimate how many people pass the site, often adjusted by traffic data. It's modelled, not counted.
- Vehicle ads are the loosest of the three. Many sellers quote a generic daily number that can't be traced to a study. We looked into it.
So a vehicle "CPM of $0.40" against a social "CPM of $10" isn't really a comparison. It's two different definitions put next to each other.
A better comparison: three numbers
1. Cost per month of presence
How much it costs to be visible for a month, whatever the channel. It's the easiest number to get and the hardest to fudge.
- Billboard: the monthly site rate.
- Own-vehicle wrap: the install cost divided by the months it will run.
- Single-car placement: the price divided by the term. A $7,000 flank feature for six months is about $1,167 a month.
- Online: your monthly spend. It stops the moment you stop paying.
2. What you can verify
Rank each option by the evidence you'll actually get: dated photos of the billboard, video of the car on the road, platform reports. Anything you can't verify, discount heavily.
3. Cost per tracked result
Give every channel its own vanity URL, promo code or landing page, and compare what it costs per visit, signup or sale that you can attribute. It's the only number that means the same thing across channels. Setting that up takes an afternoon.
What each channel is good at
| Channel | Strength | Weakness |
|---|---|---|
| Online ads | Targeting, instant tracking, switch on and off | Stops when spend stops, ad blindness |
| Billboards | Scale, one location, a sense of legitimacy | Expensive, fixed place, hard to attribute |
| Vehicle ads | Repetition, local presence, long runs | Loose metrics, glance-only creative |
| Stunts and stories | Earned coverage, shareability | Unpredictable, one-off |
The mix most small brands should run
Online ads to catch intent, plus one physical thing that makes the brand feel real. For most small budgets, that physical thing isn't a billboard. It's something with a story people want to share. That's the idea behind the Harrier.ev placements: a vehicle ad that is also a public experiment people follow.