The short answer
To create a lookalike audience on Meta, open Audiences in Ads Manager, click Create audience → Lookalike audience, and choose a source with at least 100 people from one country, such as purchasers or leads. Pick the location and an audience size from 1% (most similar) to 10% (biggest), then click Create. It is usually ready within a few hours.
Before you start
By the end of this SOP
A lookalike audience marked “Ready” that you can add to any ad set.
- Time
- 5–10 minutes
- You’ll need
- An ad account (SOP 010) and a source audience: pixel events (SOP 017), a customer list, or Page/Instagram engagers.
- Who does this
- The person responsible for paid advertising.
About this SOP: why it matters, where and when
Why it matters: Your customers already tell Meta who buys. A lookalike turns that into a new audience of similar people.
Where: In Meta Ads Manager → Audiences.
When: When you want to scale prospecting campaigns.
Stage 1
Pick a strong source
A lookalike is only as good as its source. Best to worst: buyers, leads, website visitors, engagers.
- 1
Good sources:
- Purchasers or leads from your pixel (last 30–180 days).
- A customer list uploaded as a custom audience.
- People who engaged with your Instagram account or Facebook Page.
- 2
The source needs at least 100 people from a single country. More is better; 1,000+ gives much better results.
Tip
Not enough purchasers yet? Use a step that happens more often, like Initiate checkout or Add to cart.
- 3
Before using pixel data, sanity-check it: do the event counts and values match what you see in your store or CRM?
Stage 2
Create the lookalike
- 1
In Ads Manager, open the menu → Audiences. Check the right ad account is selected.
- 2
Click “Create audience” → “Lookalike audience”.
- 3
Select your source. If you send purchase values, Meta may offer a value-based source, which favours your highest-value customers.
- 4
Choose the location where you want to find new people, e.g. India, or Kerala via a later ad set filter.
- 5
Choose the audience size: 1% is the most similar, 10% is the largest. Start with 1–3%.
Note
You can’t edit the size later. Create another lookalike instead. Up to 500 per source.
- 6
Click “Create audience”. Wait until Availability shows “Ready”, often within a few hours, up to 24.
Stage 3
Use it in an ad set
- 1
In your prospecting ad set, under Audience, add the lookalike in Custom audiences.
- 2
Exclude your existing customers so you don’t pay to reach people who already bought.
- 3
Test it against a broad audience with Meta’s A/B test tool (Experiments), not by eye.
- Run it for at least 14 days, or until each side has about 50 results.
- Decide on cost per qualified lead or sale from the client’s sheet, not only Meta’s cost per result.
Agency playbook
Doing this for a paying client
What a senior checks before calling the job done. Numbers are starting rules; compare them with the account’s own history.
What good looks like
- The source is your best customers, not everyone: enrolled students or repeat buyers, not all leads.
- Customer-list sources are refreshed at least monthly (starting rule). Pixel-based sources update by themselves.
- The test is judged on cost per qualified lead or sale, same dates and same budget, not on CTR (click-through rate).
- The prospecting ad set excludes current customers and recent leads, so the lookalike finds genuinely new people.
Mistakes we see on real accounts
- Building from all leads, junk included. Meta finds more people like the junk, and lead quality falls further.
- Running 1%, 2% and 3% lookalikes in separate ad sets. They overlap heavily, compete with each other and none exits learning.
- Uploading a customer list without consent. It risks breaking DPDP rules and Meta’s terms, and can get the account restricted.
- Never refreshing the customer list. After six months the source no longer reflects who buys today.
Agency checklist before you call it done
- The client has consent to use the customer list for ads, and their privacy policy says so (India’s DPDP Act, Digital Personal Data Protection Act).
- List formatted: phones with +91, emails in lowercase, plus name and city for a better match.
- Upload directly in Ads Manager, where Meta hashes the data. Never send raw customer lists over WhatsApp or personal email.
- Source and lookalike named per convention, e.g. “CRM-enrolled-IN-180d” and “LA-1-IN-CRM-enrolled”.
- Screenshot of the audience showing “Ready” and its size, saved in the client folder.
- Change-log entry: source, date range, size, and which ad set uses it.
- Local copies of the customer file deleted after upload, as per your agency data policy.
Handover message to the client
Hi [Client name], we built a lookalike audience from your [1,200] enrolled students (uploaded securely, raw file deleted). We’re testing it against broad targeting for 14 days at ₹[1,000]/day each. We’ll compare cost per enrolled student on [date].
Senior tip
Lookalikes built from website visitors often include people who already know you, so results look better than they are. Exclude recent visitors and leads, or run a lift test, before you call a lookalike a winner.
Practice & check
Now do it for real
Reading is not doing. Open your own account and complete this task before you move on.
Practice task (5 min)
Create a 1% lookalike from your Instagram engagers or a pixel event in your practice account. Screenshot it showing “Ready”.
Prove it
Two questions. Get both right and this SOP is done.
Common questions
How long does a lookalike audience take to be ready?
Usually a few hours, sometimes up to 24 hours. Availability shows “Ready” when you can use it.
Do lookalike audiences still work in 2026?
Yes, but with Advantage+ audience they act as a suggestion rather than a hard limit. They still help Meta find the right people faster, especially for new accounts.
What is a value-based lookalike?
A lookalike built from customers weighted by how much they spent, so Meta finds people similar to your highest-value buyers. It needs purchase values sent with your pixel events.
Done. That’s a real skill, not a certificate.
Next: SOP 075 — Plan Your Meta Ads Campaigns →
Want to do this on real client budgets, with a mentor checking your work? That’s Level 2 at Unlearn. See the Digital Marketing track