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Glossary · Paid media

Blended ROAS

Return on ad spend measured across every channel at once. It reads healthy while hiding channel level waste, and it over counts, because Meta, Google and GA4 each claim the same sale.

  • Reviewed
  • 3 min read
  • Part of the 14 term glossary
  • Median finding $58k a year across 74 audits
01

What Blended ROAS means

Blended ROAS (ROAS) is the single ratio you get when you divide all the revenue a business earned by everything it spent on advertising in the same period, across every channel at once. Meta, Google, TikTok, affiliates and retargeting all go into one denominator, every sale goes into one numerator, and the ratio no longer depends on which platform claims which order.

Teams reach for it because platform ROAS is unreliable: each ad platform reports its own return from its own attribution window, and those reports overlap. The blend removes the overlap. What it cannot do is tell you where inside the blend the money is working. A healthy blend can hide a channel that returns far less than it costs, as long as another channel is carrying it.

02

The Blended ROAS formula and a worked example

The formula, an illustration, and a calculator that runs it on your own figures.

Blended ROAS = total revenue ÷ total ad spend

Worked example Illustration, not a client figure

$420,000 of revenue on $140,000 of ad spend reads 3.0×. An incrementality holdout can put one channel's true return at 1.1×, which is the leak the blend was hiding.

Your own blended ROAS

Enter both figures to read your own ratio. It is your number, not an audited one.

03

Why Blended ROAS matters in an audit

In an audit, blended ROAS is the first number we reconcile, not the last. We rebuild it from the ledger and the ad invoices rather than from the dashboards, then compare it with the sum of what the platforms claim. When the platform total is higher than the blend, the gap is attribution inflation, and it says how much of the reported return never existed.

The second step is to split the blend. One ratio across five channels is an average, and averages hide the leak. The audits most often find one channel returning well below the blend, usually branded search or retargeting, where the spend converts customers who were already on their way. The blend reads green while that channel quietly loses money.

There is no universal good blended ROAS, because the number only means something next to contribution margin: a 3.0× return on an order that keeps 40% of its revenue after variable costs is break even, not a win. Across the 74 audits, 62% of marketing spend was effective and 22% was wasted paid spend, and the blend showed none of that split.

04

Blended ROAS in the audited cases

Published cases where Blended ROAS was at the center of the finding, each with the audited annual figure.

06

Questions about Blended ROAS

What is blended ROAS?

Blended ROAS is total revenue divided by total ad spend across every channel in the same period. It ignores platform attribution entirely, which is why it does not double count sales, and it is the ratio an audit rebuilds from the books before anything else.

How do you calculate blended ROAS?

Add up every dollar of ad spend for the period, including agency fees if they sit in the media budget, and divide the revenue for the same period by that total. $420,000 of revenue on $140,000 of ad spend is a blended ROAS of 3.0×. The calculator above does the arithmetic on your own figures.

Is blended ROAS better than platform ROAS?

It is more honest, because no platform can claim a sale twice inside it, and it is less useful on its own, because it cannot say which channel earned the return. The audit uses both: the blend as the ceiling that platform claims must add up to, and holdout tests to find what each channel truly added. Read the attribution field guide →

Know the term. Now measure it in your own numbers.

Blended ROAS, measured against your own accounts in 5 to 7 working days. $10k to $50k of findings, or your money back.

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