CPA
Cost Per Acquisition — what one new customer costs you
Tells you the unit economics of acquisition. Great complement to ROAS — you know if your customer acquisition is sustainable.
What is CPA →Metrics glossary
What is ROAS? Return on ad spend explained
ROAS (Return on Ad Spend) is the ratio of revenue to ad spend. It tells you how many dollars come back for every dollar you put into campaigns.
Formula
ROAS = ad revenue / ad spend
Example
You spend $1,000 in Google Ads, the campaign brings in $3,000 in orders. ROAS = 3 (every dollar you spent came back threefold).
Heads up: ROAS works with revenue, not profit. A high ROAS doesn't automatically mean a high margin.
What ROAS really means
ROAS is the acronym you'll hear from every ad agency, in every marketing report, and in every specialized tool. The reason is simple: it's the fastest way to compress "is this ad working?" into one number.
A ROAS of 3 means every dollar in brought back three dollars of orders. A ROAS of 1 is break-even — the ad just paid for itself. ROAS below 1 means you're selling at a loss.
Marketing managers use ROAS because it lets them compare campaigns, channels, or periods. Business owners use it because it's a number that instantly makes sense. Agencies use it because it's easy to communicate.
The formula and how to actually calculate it
The formula is trivial, but the devil is in what you plug in. "Revenue" and "spend" look unambiguous, but there are several definitions for each.
Base formula
ROAS = ad revenue / ad spend
Three practical examples
01
Apparel ecommerce
You spend $2,000 in Meta Ads. Orders attributed to that campaign total $7,000.
ROAS = 7,000 / 2,000 = 3.5
Solid for a performance campaign in fashion. With ~50% margin, real profit from ads is ~$1,500.
02
$200 online course
You spend $800 in Google Ads, sell 12 courses.
ROAS = 2,400 / 800 = 3.0
For a digital product (~95% margin), 3.0 is excellent — from $800 you made ~$1,480 profit.
03
B2B agency, lead-gen campaign
You spend $1,200, the campaign produces 8 leads, of which 1 closes a $10,000 contract.
ROAS = 10,000 / 1,200 = 8.3
In B2B, ROAS is usually calculated from closed contracts only — that's why it's an order of magnitude higher than e-commerce.
Industry benchmarks
There's no universal "good" ROAS — it depends on your margin, business model, and campaign type. Rough table so you know where to land:
| Business / campaign type | Typical ROAS range | Notes |
|---|---|---|
| Ecommerce, performance campaign | 3.0–5.0 | Below 3.0 you usually don't profit (~30% margin) |
| Ecommerce, brand campaign | 1.5–3.0 | Brand has wider impact, don't chase the number |
| Digital product / SaaS | 3.0–8.0 | High margin, you can go below 3.0 if LTV is there |
| B2B lead generation | 5.0–15.0 | Calculated from closed contracts, not leads |
| Established retailer | 5.0–10.0 | Known brand + broad catalog = steadier numbers |
| Newcomer with small brand | 1.5–3.0 | Early days are hard, brand is still growing |
Always compare ROAS against your margin. ROAS 3 on a 50%-margin product = profit. ROAS 3 on a 20%-margin product = loss.
When ROAS lies to you
ROAS is a good metric until it isn't. Here are four situations where a single number paints a misleading picture:
Revenue isn't profit
ROAS works with total revenue. If you sell a product at 20% margin, ROAS 3 means net profit of zero — everything went back to suppliers and ads. POAS (Profit on Ad Spend, return on ads as profit) would show the same case as 0.6, i.e. a loss.
Last-click attribution inflates brand campaigns
If someone orders after seeing a display banner AND searching your brand on Google, last-click credits only the brand campaign. Brand-campaign ROAS looks great, but the actual driver was the display banner that brought the visitor in first.
Short measurement window
Standard windows are 7–30 days post-click. For products with long consideration cycles (B2B, expensive electronics, furniture), the actual conversions often happen after that window — and don't show up in ROAS.
Ignores LTV (customer lifetime value)
ROAS measures only the first order. For repeat-purchase businesses, the first order is often unprofitable (ROAS 0.8), but the second, third, and tenth aren't. If you manage by ROAS, you'll kill ads that were actually building loyal customers.
Related metrics and when to use them
ROAS is useful but not enough on its own. Metrics that complement it:
MER
Marketing Efficiency Ratio — return on all marketing
Same principle as ROAS but at the company level: all revenue / all marketing spend (not just ads). Less susceptible to attribution distortions.
What is MER →POAS
Profit on Ad Spend — return on ads as profit
ROAS, but on margin instead of revenue. For lower-margin ecommerce, far more realistic. Less common still but growing fast.
CAC
Customer Acquisition Cost — fully loaded cost to acquire
Similar to CPA but counts ALL costs of acquisition (ads + tools + people). More of a finance metric than a marketing one.
Three mistakes most companies make
- 01
Comparing ROAS across channels without normalizing
Brand ROAS (people already searching for you) will always beat prospecting ROAS (you're reaching cold audiences). If you compare them side by side, brand always wins — and you slowly stop building top-of-funnel audiences. Manage them separately.
- 02
Measuring ROAS daily and panicking
Daily ROAS bounces — 5 one day, 1.5 the next. That's statistical noise on small samples. Decide based on a 7- or 14-day rolling average, not on today's number.
- 03
Ignoring seasonality
December ROAS on an ecommerce store will always beat January. If you're comparing months, compare year-over-year (Dec 2026 vs. Dec 2025), not month-over-month.
Frequently asked questions
- What's a good ROAS?
- Depends on your margin. Universal rule: ROAS must be greater than 1 / (your margin). If you have a 30% margin, you need ROAS of at least 3.3 to not lose money. For high-margin products (digital, SaaS) ROAS 2.0 is enough.
- What's the difference between ROAS and ROI?
- ROAS counts revenue per dollar of ad spend. ROI counts profit per total investment (ads + production + people + overhead). ROI is the more accurate finance metric; ROAS is the faster marketing one.
- How do I improve ROAS?
- Three reliable paths: better targeting (exclude low-converting audiences), better creative (new banners and videos every 2–4 weeks), and a better landing page (simpler path from click to order). If none of these moves the needle, the problem is usually the product or price.
- When should I use MER instead of ROAS?
- MER (whole-marketing return) is better when you have many channels and attribution is unreliable. Also when you want to see marketing's impact as a whole — for example, brand investments that lift performance campaigns long-term.
- Does ROAS work for brand campaigns?
- Poorly. Brand campaigns build awareness — their impact shows up over weeks to months, well outside the standard attribution window. For brand, track direct brand searches, traffic growth, and company-level MER instead.
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