To estimate Facebook audience size with Claude or ChatGPT, describe the places, ages and interests you want and ask for the audience size. PaidSync.ai returns a lower and upper bound of monthly active people. It accepts the same targeting shape the ad set tool uses, so the size matches what you will build.
An audience that is too narrow will not deliver, and one that is too broad wastes money. Size it first. Your assistant uses:
get_fb_audience_insights estimates monthly audience size for a targeting set, as a lower and upper bound.search_fb_interests finds valid interest IDs for the targeting.Every tool on this page only reads.
| Tool | What it needs |
|---|---|
| get_fb_audience_insights | Reads only. At least one included place. Optional: ages, genders, interests, behaviors, locales and exclusions. |
| search_fb_interests | Reads only. A search word. Optional: a limit. |
Meta hides the size when a targeting set includes or excludes customer-data audiences. That is Meta's privacy policy, not a mistake in your setup.
These steps use Claude. PaidSync.ai also works in ChatGPT, so you can estimate Facebook audience size there with the same prompts.
Create a PaidSync.ai account at paidsync.ai and approve access on Meta's own sign-in screen. Know your place, age range and a few interests.
Open Claude's connector directory, add PaidSync.ai and sign in. Ask "which Meta ad accounts can you see" and pick the account where you will estimate Facebook audience size.
Give Claude the countries, ages and interests you plan to use.
Ask for the estimate and read the lower and upper bound.
Widen or narrow and ask again, then build the ad set with the version you like.
The estimate should look similar in the Ads Manager audience size meter for the same targeting.
Every Meta tool PaidSync.ai offers is on the Meta Ads MCP server page. To build the ad set, see how to create a Facebook ad set with AI.
Describe the targeting to Claude or ChatGPT and ask for the size through PaidSync.ai.
A lower and upper bound of monthly active people.
Meta hides it when the targeting uses customer-data audiences.
No. It only reads.
The free plan includes 15 tasks a month with no card, enough to try how to estimate Facebook audience size. Pro starts at $99 a month, listed on pricing.
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