Blended ROAS
Paid MediaAlso: Total ROAS · Overall ROAS
Quick definition
Blended ROAS (return on ad spend) is total revenue divided by total ad spend across every channel combined, rather than one platform's self-reported number. It answers whether your overall paid media investment is profitable, not which channel deserves the credit.
There's no universal healthy blended ROAS. What matters is whether the multiple covers your gross margin, overheads and the cost of everything that isn't ad spend.
How it varies across Australia
Blended ROAS almost always sits lower than the sum of individual platform-reported ROAS figures, because platforms overlap in the credit they claim for the same sale. The gap between blended and platform-reported numbers varies by how many channels are running and how aggressively each platform models conversions.
Compare acquisition performance across Australian industries →What it actually means
Every ad platform grades its own homework. Meta claims credit for a sale, Google claims credit for the same sale, and if you ran email or affiliate too, they might claim it as well. Add up the ROAS each platform reports and you'll often find the total revenue implied is larger than your actual bank balance.
Blended ROAS fixes this by ignoring platform-level attribution entirely. It takes total revenue from your business, in your source of truth, and divides it by total ad spend across every channel. No double-counting, no generous attribution windows, no modelled conversions inflating the picture.
The tradeoff is that blended ROAS tells you nothing about which channel is doing the work. It's a business health check, not a media-buying tool. Pair it with channel-level CPA and a proper attribution model if you need to decide where the next dollar of spend goes.
Think of blended ROAS as your bank statement and platform-reported ROAS as everyone's individual invoice for the same job. Both are useful. Only one of them reconciles.
Add up every platform's ROAS and you'll have claimed more revenue than your business actually made. Blended ROAS is the number that can't lie that way.
How to calculate it
Blended ROAS = Total revenue ÷ Total ad spend across all channels
Worked example. You spent $8,000 across Meta, Google and TikTok combined last month. Total business revenue for the same period was $32,000. Blended ROAS = $32,000 ÷ $8,000 = 4. For every dollar spent on ads across all channels, you generated four dollars in revenue.
The Australian context
Australian businesses running paid media across Meta, Google and TikTok simultaneously see some of the largest gaps between summed platform-reported ROAS and blended ROAS, because iOS tracking limitations push each platform toward modelled conversions that lean generous. Businesses that report blended ROAS to their board alongside platform numbers tend to catch inflated spend decisions earlier.
Where people get this wrong
Related terms
Common questions
Why is my blended ROAS lower than my platform-reported ROAS?
Because platforms overlap in the credit they claim. Meta and Google can both report the same sale as theirs. Blended ROAS uses one revenue figure for the whole business, so it can't be inflated by overlapping attribution claims.
Should I use blended ROAS or platform ROAS to set budgets?
Neither on its own. Use channel-level metrics like CPA and platform ROAS alongside an incrementality test to decide where budget goes. Use blended ROAS to check the whole system is still profitable after those decisions are made.
What's a good blended ROAS?
There isn't a universal number. It depends on your gross margin, average order value and how much non-ad cost (staff, tools, content) needs to be covered. A blended ROAS of 3 might be excellent for one business and unsustainable for another.
How often should I calculate blended ROAS?
Monthly at minimum, ideally alongside your finance team's revenue reconciliation. Calculating it weekly on small data sets can produce noisy swings that don't reflect real changes in performance.
Debrief
Get the next one
No spam. No fluff. Just the next article, straight to your inbox.
Keep exploring
About New Rebellion
New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.
How we think →