Return on Ad SpendROAS
How much revenue each rupee of ad spend produced. A 3× ROAS means ₹100 of ads returned ₹300 of revenue.
ROAS = Revenue ÷ Ad spend
Why it mattersIt says nothing about profit. A 3× ROAS is excellent for one cost structure and loss-making for another, which is why break-even ROAS exists.
Blended ROAS
Total revenue from all sources divided by total ad spend across all platforms, not the number any single ad platform reports.
Blended ROAS = Total revenue ÷ Total ad spend
Why it mattersPlatforms each claim credit for the same sale. Blended ROAS is the only version that reconciles with your bank account.
Break-even ROAS
The exact ROAS at which an order makes you neither profit nor loss. Below it you are paying for revenue.
Break-even ROAS = Revenue per order ÷ Contribution per order
Why it mattersYour real target, and it comes from your cost sheet, not from a benchmark someone quoted on LinkedIn.
Customer Acquisition CostCAC
What you pay in marketing to win one new customer.
CAC = Marketing spend ÷ New customers acquired
Why it mattersMeaningless on its own. It only means something next to contribution margin and repeat rate.
Cost Per MilleCPM
What it costs to show your ad one thousand times. 'Mille' is Latin for thousand.
CPM = Ad spend ÷ Impressions × 1,000
Why it mattersRises with competition and with narrow targeting. It sets how much attention your budget can buy at all.
Cost Per ClickCPC
What you pay for one click on your ad.
CPC = Ad spend ÷ Clicks
Why it mattersA blunt instrument: cheap clicks from the wrong audience cost more than expensive clicks from the right one.
Cost Per OrderCPO
Advertising cost divided by the number of orders it produced, including repeat buyers.
CPO = Ad spend ÷ Orders
Why it mattersClose cousin of CAC, but counts every order rather than only first-time customers.
Click-Through RateCTR
The share of people who clicked after seeing your ad.
CTR = Clicks ÷ Impressions × 100
Why it mattersThe clearest read on whether the creative earns attention. A weak hook shows up here before anywhere else.
Impressions
The number of times your ad was displayed. Not people: the same person seeing it three times is three impressions.
Why it mattersThe top of every funnel. Spend and CPM together decide how many you get.
Marketing Efficiency RatioMER
Total company revenue divided by total marketing spend: a whole-business view rather than a campaign one.
MER = Total revenue ÷ Total marketing spend
Why it mattersImmune to attribution arguments, because it never tries to assign credit to a channel.
Attribution
Deciding which ad or channel gets credit for a sale when a customer saw several before buying.
Why it mattersSince Apple's tracking changes, platform-reported attribution over-claims badly. Blended numbers and incrementality tests are the corrective.
Creative Fatigue
The decline in an ad's performance as the same audience sees it repeatedly.
Why it mattersUsually a symptom of a thin creative thesis rather than a thin budget: one idea in eleven costumes fatigues as fast as one ad.