ROAS / MER Calculator
Compute ROAS (per channel), MER (blended), break-even ROAS by margin, and target spend. The post-iOS 14.5 marketing-math standard. Free.
ROAS / MER Calculator
ROAS measures channel-level efficiency (attributed revenue ÷ ad spend). MER (Marketing Efficiency Ratio) measures blended efficiency (total revenue ÷ total marketing). After iOS 14.5 broke per-channel attribution, MER became the trusted top-line metric for most DTC + SaaS marketers. The tool computes both, plus break-even ROAS at your gross margin.
How to Use the ROAS / MER Calculator
Pull attributed revenue + spend per channel
From Meta Ads Manager, Google Ads, TikTok Ads — each platform's reported "purchase value." Post iOS 14.5, these undercount by 20-40% so don't treat them as ground truth.
Pull total revenue + total marketing
From your ERP / Shopify / Stripe for revenue. From your finance system for marketing — include all paid channels, agency fees, retainer creative, influencer payments. Use the same period.
Enter your gross margin %
Net of COGS, shipping, payment processing. Most consumer brands run 40-65%; SaaS 70-90%; commodity retail 20-30%. This determines your break-even ROAS — the ROAS below which you actually lose money on each marketing dollar.
Read MER first, then channel ROAS
MER is the trustworthy top-line. Channel ROAS is platform-reported and post-iOS-14.5 noisy. If MER is healthy but a single channel's ROAS looks scary low, the channel may still be working — its attribution is just broken. Cut spend only if both MER and the channel ROAS drop in tandem.
ROAS vs MER vs POAS — The Post-iOS 14.5 Marketing-Math Stack
Why MER Replaced ROAS as the Top-Line Metric
Pre-iOS 14.5 (April 2021), channel-attributed ROAS was the gold standard for paid media optimisation. Meta and Google's pixel-based attribution was accurate enough that "Facebook says we made USD 4 for every USD 1 spent" was a meaningful claim. The Apple App Tracking Transparency policy broke that — iOS users now have to opt in to tracking, and ~80% don't. Meta's reported revenue undercounts by 20-40% for typical e-commerce; smaller brands see undercounts of 50%+. Channel ROAS became fundamentally unreliable for opt-out-heavy iOS traffic.
MER (Marketing Efficiency Ratio) — total revenue ÷ total marketing spend, with no attempt at per-channel attribution — emerged as the trusted top-line metric because it's based on actual revenue (not platform-reported attributed revenue) and actual total marketing spend (which you control). MER doesn't tell you which channel drove the revenue, but it tells you the truth about whether marketing in aggregate is paying off. Most modern DTC + SaaS brands now lead with MER on their marketing dashboards, with channel ROAS as a secondary directional metric.
Break-Even ROAS — The Math That Most Marketers Skip
Break-even ROAS = 1 ÷ gross margin. At 50% gross margin, break-even ROAS is 2× — every dollar of ad spend needs to generate USD 2 of revenue just to cover the variable cost of the goods sold. At 25% margin (typical e-commerce after platform fees), break-even is 4×. At 75% margin (SaaS), break-even is 1.33×. Channel reports often show ROAS of "2.5×" or "3×" as wins, but if your gross margin is 30%, that's barely covering COGS and contributing zero toward overhead, salaries, or profit. Most "winning" Meta campaigns at 2-3× ROAS are actually losing money for consumer brands after the full P&L.
POAS (Profit On Ad Spend) = ROAS × gross margin. This is the more useful single number — it tells you actual dollar profit per ad dollar. POAS of 1.0× = break-even (you got back exactly what you spent). POAS of 1.5× = healthy. POAS of 2.0×+ = excellent. POAS below 1.0× = losing money on every ad dollar regardless of how impressive ROAS looks. The mathematically-rigorous brands have largely shifted to POAS-based bidding instead of ROAS-based; Google Ads added POAS bidding in 2023.
"A 3× ROAS sounds great. At 30% gross margin, break-even ROAS is 3.33×, so 3× is losing money on every ad dollar. The ROAS dashboards make this invisible. POAS = ROAS × Margin. That single multiplication exposes whether marketing is making or burning money."
Healthy MER and ROAS Benchmarks
MER targets by stage: early-stage DTC (Year 1, growth-mode): MER 1.5-2.0× (heavy reinvestment, paid CAC > LTV is acceptable). Established DTC (Year 3+, sustainable): MER 3-5× (profitable on a unit basis with reasonable share of marketing in-budget). Mature DTC or B2B SaaS: MER 6-10× (mostly organic + retention; paid is supplemental). Channel ROAS by platform (with iOS 14.5 caveats): Meta 2-4× typical, 5×+ excellent; Google Search 4-8× typical (high-intent traffic); TikTok 1.5-3× typical (lower-intent / discovery); Pinterest 2-4× typical; YouTube 2-4× brand awareness oriented. Always benchmark vs your industry + business stage, not vs global averages.
The MER Trap At Scale
MER quietly hides the channel mix problem at scale. A brand that doubles spend and watches MER hold steady looks healthy — but if 80% of the spend lift went into a single channel with declining incremental return, the next doubling will break the model. The defence is to track MER alongside individual channel ROAS trend lines and a periodic incrementality check (geo-holdout test once or twice a year). If MER is stable but the channel that drives most spend is showing declining ROAS, you're in the slow-build-up to a marketing crisis even though the top-line metric looks fine. Use MER as the headline; never use it alone.
10 Facts About ROAS and MER
ROAS = Revenue ÷ Ad Spend (per channel). MER = Total Revenue ÷ Total Marketing (blended).
iOS 14.5 (Apr 2021) broke channel-level attribution. ~80% of iOS users opt out of tracking.
Meta reported revenue undercounts 20-40% for typical e-com post-ATT.
Break-even ROAS = 1 ÷ Gross Margin. At 50% margin, you need 2× ROAS to break even.
POAS = ROAS × Margin. Exposes whether ads make or burn money.
Google Ads added POAS-based bidding in 2023 — first major platform to natively support it.
MER 3-5× is healthy for established DTC; 1.5-2× acceptable in growth-mode Year 1.
Mature SaaS often runs MER 6-10× — mostly organic + retention with supplemental paid.
Triple Whale, Rockerbox, Northbeam emerged 2021-2023 to fix post-ATT attribution.
iROAS (incremental ROAS) measured via geo-holdout tests is the rigorous-attribution gold standard.
Frequently Asked Questions
- ROAS measures a single channel's attribution-reported revenue against its spend. MER (Marketing Efficiency Ratio) measures total business revenue against total marketing spend — no attribution, no channel-level attribution at all. Post-iOS 14.5, MER is the more trustworthy top-line because it doesn't rely on platform attribution that's now meaningfully broken. ROAS is still useful for relative channel comparison but should not be treated as ground truth.
- Post-ATT (Apple App Tracking Transparency), Meta only reliably attributes ~20-40% of true revenue for iOS users. So Meta-reported ROAS undercounts by a similar ratio. If your true MER is 4× and Meta shows 2× ROAS, the channel may actually be performing close to 4× — Meta just can't see most of the conversions. The fix: trust MER for top-line, use Meta ROAS as a relative-trend metric (is it going up or down) rather than an absolute claim.
- Break-even ROAS = 1 ÷ Gross Margin. It's the ROAS below which you lose money on every ad dollar even before counting overhead. At 50% margin, you need 2× ROAS to recover your COGS. At 30% margin, you need 3.33×. At 75% margin (typical SaaS), you need 1.33×. Most marketers don't compute this and end up celebrating "winning" 2-3× ROAS campaigns that are actually losing money for low-margin businesses.
- POAS (Profit On Ad Spend) = ROAS × Gross Margin. It tells you actual dollar profit per ad dollar after COGS. POAS > 1 means profitable; POAS < 1 means losing money. Yes — it's strictly more useful than ROAS because it bakes in the margin reality. The challenge: it requires you to feed product-level margin data into your ad platform (Google Ads supports this; Meta doesn't natively). For most brands, POAS-aware ROAS reporting in spreadsheets / BI tools is the practical compromise.
- Depends on stage and business model. Early-stage DTC in growth mode: MER 1.5-2.0× is acceptable (you're paying for share grab, planning to recover via repeat orders). Established DTC at scale: MER 3-5×. Mature brands and B2B SaaS: MER 6-10× (most revenue from organic / retention; paid is supplemental). If MER is below 1.5×, marketing is destroying value at the business level — investigate immediately. If MER is above 10× and growth has stalled, you're under-investing in marketing.
- Yes — total marketing spend means total. Include media spend, agency retainers, creative production, influencer payments, sponsored content, affiliate commissions, marketing tools (Klaviyo, Triple Whale, etc.). Exclude only true overhead (the CMO's salary, marketing intern). The cleanest definition: anything that scales up if you grow marketing investment. Most brands' "marketing spend" reported to their CFO is 1.5-2× the media-only number — make sure MER is computed on the full figure.
- They blend platform-reported attribution with first-party survey data, post-purchase "How did you hear about us?" surveys, and probabilistic modelling to estimate true channel contribution. Northbeam, Rockerbox, Triple Whale, Polar, and Posthog (open-source) all compete in this space. Helpful for medium-large brands; expensive (USD 1K-5K/month). For sub-USD 1M/month spend, MER alone is usually sufficient.
- iROAS measures the lift from ads vs a holdout group that didn't see ads. The gold standard: geo-experiments (run ads in 5 states, hold out 5 similar states, measure revenue difference). Meta, Google, and TikTok all offer "conversion lift" studies that approximate this. iROAS is the only rigorously-attributed ROAS — but it's expensive (requires holdout that doesn't see ads), slow (takes 4-8 weeks), and only feasible for large spenders. For most brands, MER + directional channel ROAS is the practical compromise.
- Lead with MER. Most CFOs and CEOs find "total revenue ÷ total marketing" intuitive and trust it because the inputs are unambiguous. Add POAS as the profit-side companion (revenue is good; profit is better). Channel ROAS is for your internal optimisation conversations, not stakeholder reports — too easy to misinterpret post-iOS-14.5. The standard pattern: dashboard MER and POAS at the top; channel ROAS as second-row optimisation detail.
- US ad CPMs are 3-5× higher than ASEAN domestic, but US AOV and US LTV are usually 2-4× higher too — the math typically works if your COGS is ASEAN-priced and revenue is USD. Watch out for fulfilment cost (USD 8-15/order for ASEAN-to-US shipping eats meaningful margin), and customs / tariffs (sometimes adds 5-15%). Run MER with all-in landed COGS, not factory cost; this catches the hidden international-fulfilment drag that local-only competitors don't face. iOS 14.5 attribution gap is identical in any market; the MER-first framework applies.
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