CAC is simply what you pay, on average, to win one paying customer. Our model builds it from four things you can actually estimate:
CPM is what you pay for 1,000 people to see your ad (RED/Douyin ≈ RMB (Renminbi) 150–250). The more you pay per view, the higher your CAC.
CTR = % who click; CVR = % of clicks who buy. A 1.5% click and 2% buy means only 0.03% convert — so you pay for a LOT of views per sale.
The "shortcut." A brand Chinese consumers already know/trust (1.0) gets cheap organic reach; an unknown (0.1) pays full freight. This is the education cost of entering China.
CAC alone means nothing. We divide it by your net profit per item to get payback in items: how many products you must sell to recover the acquisition cost. ≤ 1 item means the first order pays for itself.
Formula: CAC = (CPM ÷ 1000) ÷ (CTR × CVR) ÷ brand coefficient Worked example (default inputs): CAC = (180 ÷ 1000) ÷ (1.5% × 2%) ÷ 0.5 = 0.18 ÷ 0.0003 ÷ 0.5 = RMB 1,200 Payback = 1,200 ÷ 180 = 6.7 items → Hard
You open a lemonade stand. You print 1,000 flyers and pay RMB 0.25 each to hand them out — that's your CPM. Only 15 kids out of 1,000 even look (your CTR of 1.5%), and only 2 of those buy a cup (your CVR of 2%). To get one sale, you paid for a mountain of flyers — that whole cost for one cup is your CAC.
Now: if the neighbor kids already know and love your lemonade (a strong brand), they tell their friends for free — you barely pay for flyers. That's a high brand coefficient. If nobody knows you, you pay for every single flyer yourself — that's a low coefficient and a painful CAC.
The trick: if each cup earns you RMB 5 profit and your CAC is RMB 10, you lose on the first cup but break even by the second. If your CAC is only RMB 2, the first cup already pays for itself. That's why we check CAC against your profit per cup — not the CAC number alone.
CAC · CPM · CTR · CVR · RMB
No brand, thin margin → acquisition cost is brutal. Fix the brand signals before spending on media.
Known and trusted → cheap organic reach. The first order already pays for itself.
CAC looks huge — but each sale earns RMB 2,000, so the first order still pays back. Margin beats the raw number.