--- title: "Blended ROAS: Definition, Formula and Example | MarginFix" description: "Blended ROAS is total revenue divided by total ad spend across every channel. What it shows, what it hides, how an audit rebuilds it from the books,." url: https://marginfix.ai/glossary/blended-roas/ lastmod: 2026-10-08 --- Your number See this page in your own figures: industry, spend and the estimated leak. [Run the estimator →](/estimator/) [Home](/) › [Glossary](/glossary/) › Blended ROAS 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 Oct 2026 - 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 $140,000 of ad spend reads 3.0×. An incrementality holdout can put one channel's true return at 1.1×, which is the leak the blend was hiding. Your own blended ROAS Revenue ($) Ad spend ($) 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. - /cases/the-agency-s-winning-campaign-was-the-biggest-loser/DTC / Ecommerce ### The agency’s ‘winning’ campaign was the biggest loser - −$53k a year, findings in 7 days. - Read the case → - /cases/retargeting-was-paid-twice-for-the-same-customer/DTC / Ecommerce ### Retargeting was paid twice for the same customer - −$31k a year, findings in 5 days. - Read the case → - /cases/paid-was-subsidising-a-channel-sales-already-owned/B2B SaaS ### Paid was subsidizing a channel sales already owned - $41k a year, findings in 5 days. - Read the case → - /cases/online-ads-were-paying-for-in-store-demand/Retail ### Online ads were paying for in store demand - −$88k a year, findings in 7 days. - Read the case → - /cases/dtc-ads-were-cannibalising-higher-margin-retail/Manufacturing ### DTC ads were cannibalizing higher margin retail - +$73k a year, findings in 7 days. - Read the case → - /cases/affiliate-commissions-were-being-paid-on-sales-the-brand-alr/DTC / Ecommerce ### Affiliate commissions were being paid on sales the brand already owned - −$44k a year, findings in 5 days. - Read the case → - /cases/paid-search-was-bidding-on-supply-the-platform-already-ranke/Marketplace ### Paid search was bidding on supply the platform already ranked for - −$66k a year, findings in 6 days. - Read the case → 05 ## Related terms and guides ### Related terms - [MER](/glossary/mer/) Total revenue divided by total marketing spend, a blended, platform independent efficiency measure. - [Attribution inflation](/glossary/attribution-inflation/) When several platforms each claim the same sale, so attributed revenue adds up to more than 100% of actual revenue. - [Non incremental spend](/glossary/non-incremental-spend/) Ad budget that buys conversions you would have won without it, classically branded search against customers already intending to purchase. - [Wasted ad spend](/glossary/wasted-ad-spend/) Media budget producing no incremental margin. - [Margin leak](/glossary/margin-leak/) A recurring, usually invisible loss of marketing margin, whether wasted paid spend, mispriced offers or retention drop off, that a healthy looking blended metric conceals. - [Incrementality](/glossary/#incrementality) The share of conversions that happened because of the spend, against those that would have occurred anyway. - [Contribution margin](/glossary/#contribution-margin) Revenue minus every variable cost per order or unit: cost of goods, shipping, payment fees, returns. ### Guides that use this term - [Your ROAS is lying to you](/insights/roas-attribution-field-guide/) The attribution field guide: why every platform claims the same sale. - [How to audit your agency](/insights/how-to-audit-your-marketing-agency/) Without firing it: the questions that separate reported return from real return. - [What good looks like by spend band](/insights/smb-marketing-spend-benchmarks/) Leak share, attribution gap and the median finding from $10k to $250k a month. - [Audit or agency self review](/compare/independent-audit-vs-agency-review/) What an independent read adds to the numbers your agency reports. - [Agency markup](/agency-markup/) The fees inside the media invoice that a platform ROAS never sees. 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 →](/insights/roas-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. [Book the audit](/book/) [Back to the glossary](/glossary/) Fixed fee. No retainer. NDA first. Go deeper ## Go deeper - [All 14 terms The full glossary: every term with a formula and a worked example.](/glossary/) - [All 74 findings Ranked by annual value, $58k median, each one a real case.](/findings/) - [The benchmark Where 74 SMB marketing budgets leaked, by share of spend and by industry.](/benchmark/) - [Margin leaks The five leak patterns in depth: what each one is and how an audit finds it.](/margin-leaks/) - [Marketing audit checklist Thirty checks across paid media, attribution, pricing, retention and reporting.](/marketing-audit-checklist/) - [What an audit costs The 2026 market ranges with sources, against the fixed fee tiers.](/marketing-audit-cost/)