What is customer acquisition cost, and how do you lower it?
By Ahmed Fawzi
Published 2026-10-04 · Updated 2026-10-04
What is customer acquisition cost and how do you calculate it?
CAC is what one new customer costs you. HubSpot defines it as the total expense needed to secure a new customer.
Formula: CAC = total acquisition costs ÷ number of new customers, in the same period.
Acquisition costs include ad spend, agency fees, content production, sales team salaries, tools and related overhead (HubSpot).
Worked example (illustrative)
An Egyptian ecommerce brand spends EGP 300,000 on ads, EGP 60,000 on agency and content, and EGP 90,000 on sales and tools in one month. It gains 1,500 new paying customers. CAC = EGP 450,000 ÷ 1,500 = EGP 300.
Count new paying customers only. Sign ups, installs and leads are cost per action (CPA), a leading signal, not CAC. Brian Balfour makes this point clearly in his widely cited CAC guide (andrewchen.com).
Blended CAC vs paid CAC: what is the difference?
| Formula | Use it to | |
|---|---|---|
| Paid CAC | Paid media cost ÷ customers from paid media | Judge and optimize ad channels |
| Blended CAC | All acquisition cost ÷ all new customers, including organic and referral | Judge the health of the whole business |
| Fully loaded CAC | Blended CAC plus salaries, tools and overhead | Plan budgets and talk to investors |
Paid CAC is always higher than blended CAC, because organic customers cost little. If blended CAC looks great but paid CAC keeps rising, your growth depends on word of mouth that may not scale.
Also watch timing. If your sales cycle takes 60 days, this month's customers came from last month's spend. Match costs and customers to the right period.
LTV:CAC and payback: is your CAC healthy?
CAC alone does not tell you if it is too high. Compare it with LTV (lifetime value), the gross profit a customer brings over their whole relationship with you.
HubSpot recommends that lifetime value be at least three times acquisition cost, which leaves room for profit and reinvestment. A ratio below 1 means you lose money on every customer.
Payback period tells you how fast you get the CAC back. Payback (months) = CAC ÷ monthly gross profit per customer. In our example, if each customer brings EGP 60 gross profit per month, payback is EGP 300 ÷ 60 = 5 months.
| What it means | What to do | |
|---|---|---|
| LTV:CAC below 1 | You lose money on each customer | Fix margin, price or retention before scaling |
| LTV:CAC 1 to 3 | You break even or earn thin profit | Lower CAC and raise repeat purchase |
| LTV:CAC 3 or more | Healthy unit economics | Scale spend while watching CAC |
| LTV:CAC far above 5 | You may be under investing | Test more budget and new channels |
8 ways to lower customer acquisition cost
- Fix tracking first. Missing events make platforms optimize for the wrong people. Check pixels, conversion APIs and app measurement tools such as AppsFlyer or Adjust.
- Optimize for the right event. Bid for purchases or first transactions, not cheap installs or clicks that never convert.
- Test creative at volume. In our experience, creative is the biggest lever in today's auctions. Test hooks, offers and formats before you scale spend.
- Make need based cutdowns. Short versions of one video, each answering a specific need or objection, often beat one generic ad.
- Improve conversion rate. A faster landing page, a shorter sign up and clear Arabic copy lower CAC without touching ad cost.
- Activate users you already paid for. Many installs never reach a first purchase or transaction. Onboarding and CRM messages turn installs into customers.
- Grow cheaper channels. Referral, SEO, organic social and UGC lower blended CAC over time.
- Cut waste. Exclude existing customers from prospecting, pause weak placements and stop bidding on audiences that never convert.
Proof: lowering CAC while spend grew
For a leading Egyptian fintech app in 2024, we cut customer acquisition cost by 35%, then by a further 13%, about 43% in total, while spend scaled up.
How we did it: our performance team led the creative, with 200+ tests before scale and 25 need based video cutdowns. We migrated tracking from AppsFlyer to Adjust and pushed first time activation, reaching a 38% first time activation rate. The app reached 1 million registered users in 9 months, 3 months ahead of plan.
How we approach CAC at OneKind
- Agree on one definition of a customer with finance and product: first purchase, first transaction or paid subscription.
- Calculate paid, blended and fully loaded CAC for the last 3 to 6 months as a baseline.
- Calculate LTV and payback by channel and by market, since Egypt, Saudi Arabia and UAE customers often differ in basket size and retention.
- Set a target CAC from LTV and cash position, not from industry averages.
- Run the 8 levers above in order of impact, starting with tracking and creative.
- Report CAC weekly next to new customer volume, so cost cuts do not hide shrinking growth.
See our growth marketing service
Related guides
What is ROAS, and what is a good ROAS?
Sources
HubSpot: Customer acquisition cost
Andrew Chen (Brian Balfour): How to (actually) calculate CAC
FAQ
What is a good customer acquisition cost?
A good CAC is one your customer lifetime value covers at least three times over. The same CAC can be healthy for a subscription app and too high for a one time purchase store.
What is the difference between CAC and CPA?
CPA is the cost of any action, such as an install, lead or sign up. CAC is the cost of a new paying customer, so it is usually higher.
Should CAC include salaries?
For fully loaded CAC, yes: include sales and marketing salaries, tools and overhead. For optimizing ad channels, paid CAC with only media cost is more useful.
What is CAC payback period?
It is the number of months a customer takes to repay their acquisition cost from gross profit. Shorter payback means you can reinvest and grow faster.
Why does CAC rise when I scale spend?
As budgets grow, platforms reach less interested people and creative wears out faster. Fresh creative, better conversion rates and new channels keep CAC in check.
Want to lower your CAC while you grow? Get a CAC review from our team