See your real, whole-business return on ad spend — across every channel at once.
What is blended ROAS?
Blended ROAS measures your total revenue against your total ad spend across every channel — not just what a single ad platform claims it drove.
Blended ROAS = Total revenue ÷ Total ad spend
If your business made $120,000 last month and you spent $40,000 on ads across Meta, Google, and TikTok combined, your blended ROAS is 120,000 ÷ 40,000 = 3x.
Why blended ROAS beats platform ROAS
Every ad platform reports its own ROAS — and they routinely over-claim, because Meta and Google both take credit for the same conversion. Add up their reported revenue and it can exceed your actual sales. Blended ROAS sidesteps attribution games entirely: it uses real money in versus real money out, so it can't be double-counted. Many operators now treat blended ROAS (sometimes called MER, marketing efficiency ratio) as their north-star metric and use platform ROAS only for relative, in-channel optimization.
How to use it
Track blended ROAS over time and watch how it moves as you scale spend. If you push budget up and blended ROAS holds, you're scaling efficiently. If platform dashboards look great but blended ROAS is sliding, you've found attribution inflation. Pair this with the single-channel ROAS calculator to see both the micro and macro picture.
Frequently asked questions
What is blended ROAS?
Blended ROAS is total revenue divided by total ad spend across all channels. Unlike platform-reported ROAS, it uses your real top-line revenue, so it cannot be inflated by overlapping attribution between ad platforms.
What is the difference between blended ROAS and platform ROAS?
Platform ROAS is what a single ad network (e.g. Meta) reports it drove, based on its own attribution. Blended ROAS ignores attribution and compares your entire revenue to your entire ad spend, giving a more honest, business-wide view.
Is blended ROAS the same as MER?
Effectively yes. MER (marketing efficiency ratio) is total revenue divided by total marketing spend — the same idea as blended ROAS. Different teams use the terms interchangeably.
What is a good blended ROAS?
It depends on your margins, just like regular ROAS. Many brands aim for around 3x or higher, but a lower blended ROAS can be fine during aggressive growth as long as you stay above your break-even point.
Should I use blended ROAS or platform ROAS?
Use both. Platform ROAS is useful for optimizing individual channels (which ad set to scale, which to cut). Blended ROAS is your sanity check on whether total ad spend is actually growing the business — use it as your top-level KPI.
How often should I track blended ROAS?
Most brands review it weekly or monthly alongside total revenue and total ad spend. Sudden drops often signal attribution inflation on a platform, margin compression, or scaling into less efficient audiences.