The ROI Problem in Hong Kong Marketing
Ask ten Hong Kong business owners whether their marketing is working and you'll get ten vague answers. "I think so." "We're getting some leads." "Our Instagram followers went up." None of these are measurements. They're feelings.
Marketing ROI isn't complicated. It's three numbers, tracked consistently, compared monthly. This framework gives you the exact formulas, the HK-specific benchmarks, and the spreadsheet logic to know — with certainty — whether your marketing spend is profitable.
Metric 1: Customer Acquisition Cost (CAC)
The Formula
CAC = Total Marketing Spend ÷ Number of New Customers Acquired
If you spent HK$45,000 on marketing last month and acquired 18 new paying customers, your CAC is HK$2,500.
What Good Looks Like in Hong Kong
CAC varies dramatically by industry. Here are HK benchmarks based on aggregated client data:
F&B: HK$80–250 per new diner (reservation lead via WhatsApp)
E-commerce (beauty/health): HK$150–400 per first purchase
Professional services: HK$800–2,500 per qualified lead
Luxury buyback (diamonds, watches): HK$300–800 per inquiry
Financial services (lending): HK$200–600 per application
The CAC Trap
A low CAC isn't automatically good. If you're acquiring cheap customers who never come back, your marketing is a revolving door. CAC only matters in relation to LTV — which is why we track both.
Metric 2: Return on Ad Spend (ROAS)
The Formula
ROAS = Revenue Generated from Ads ÷ Ad Spend
If your Meta Ads generated HK$180,000 in revenue from HK$40,000 in spend, your ROAS is 4.5x.
ROAS Benchmarks by Channel (Hong Kong 2026)
Meta Ads: 3–6x (healthy), below 2x (unprofitable for most margins), above 6x (scale aggressively)
Google Search: 4–8x (healthy), below 3x (review keywords and landing pages)
Google Display: 1–2x cold, 4–8x remarketing
Email: 8–15x (for engaged lists), near-zero for dormant lists
Why Platform-Reported ROAS Lies
Meta and Google both over-report ROAS because they use attribution windows that claim credit for sales that would have happened anyway. Meta's default 7-day click, 1-day view window means if someone sees your ad on Monday and buys directly on your website on Saturday, Meta claims that sale. Google does the same with its 30-day click window.
The fix: track blended ROAS. Total revenue ÷ total ad spend across all platforms. This single number eliminates the double-counting problem and tells you whether your total marketing system is profitable.
Metric 3: Customer Lifetime Value (LTV)
The Formula
LTV = Average Order Value × Purchase Frequency × Customer Lifespan
If your average customer spends HK$500 per visit, comes 4 times per year, and stays for 2 years, their LTV is HK$4,000.
The LTV:CAC Ratio
This is the single most important number in your marketing. It tells you how much value each acquired customer creates relative to what you paid to get them.
Below 2:1 — You're losing money. Every customer costs more to acquire than they're worth. Fix your retention, raise prices, or cut acquisition costs.
3:1 — The healthy baseline. For every HK$1 spent on acquisition, you get HK$3 in lifetime value. Most sustainable businesses operate here.
Above 5:1 — You're under-investing in growth. If customers are worth 5x what you pay to acquire them, you should be spending more on marketing to accelerate growth.
Building Your Monthly Dashboard
You don't need fancy analytics software. A Google Sheet with five columns will do:
Column A: Month
Column B: Total marketing spend (all channels combined)
Column C: New customers acquired
Column D: Revenue from those customers (first 30 days)
Column E: CAC (B ÷ C) and ROAS (D ÷ B)
Update this on the 1st of every month. In three months, you'll see trends. In six months, you'll have enough data to make confident allocation decisions. In twelve months, you'll have a marketing system that runs on data, not gut feelings.
Common Mistakes HK Businesses Make
Measuring Too Many Things
Dashboards with 30 metrics create analysis paralysis. Track CAC, ROAS, and LTV. Everything else is a supporting detail that you look at only when one of the three big numbers moves in the wrong direction.
Comparing Channels Instead of Systems
"Meta ROAS is 3x but Google ROAS is 5x, so let's move all budget to Google." This logic fails because Meta creates the demand that Google captures. Kill Meta and watch your Google ROAS collapse within 30 days.
Ignoring Offline Conversions
Many HK businesses convert through WhatsApp or in-store visits. If you're not tracking WhatsApp leads back to the ad that generated them, you're dramatically under-reporting ROAS. Use UTM parameters and a simple lead tracking sheet to close the loop.
Bottom Line
Marketing ROI comes down to three questions: How much does a customer cost to acquire? How much do they spend over their lifetime? Is the ratio between those two numbers sustainable? Answer these monthly, and you'll never wonder whether your marketing is working again.
